Journal of East African Natural History 97(1): 19–32 (2008)
FIRST RECORD OF MYOSOREX (MAMMALIA: SORICIDAE)
FROM MALAWI WITH DESCRIPTION AS A NEW SPECIES,
MYOSOREX GNOSKEI
Julian C. Kerbis Peterhans
Roosevelt University
430 S. Michigan Ave., Chicago, IL 60605, USA
&
Division of Mammals, Field Museum of Natural History
Chicago, IL, 60605-2496, USA
jkerbis@fieldmuseum.org
Rainer Hutterer
Zoologisches Forschungsmuseum Alexander Koenig
Adenauerallee 160, D-53113 Bonn, Germany
r.hutterer.zfmk@uni-bonn.de
Potiphar Kaliba, Lovemore Mazibuko
Museums of Malawi
P.O.Box 30360, Chichiri, Blantyre, 3, Malawi
ABSTRACT
We describe a new species of Myosorex from Nyika National Park, northern
Malawi. Myosorex gnoskei (the Nyika burrowing shrew) represents the first
record of the genus from the country. Recently collected between pine plantations
and adjacent to the headquarters of a major national park, this new species of
shrew highlights the need for further comprehensive sampling of habitats, even
those thought to be ‘well-known’ and adjacent to human disturbance. The
specimen was taken at an elevation of 2285 m., suggesting a relict montane
distribution. In cranial dimensions, this new species of shrew rivals Myosorex
kihaulei, and ranks second only to Myosorex schalleri as the smallest described
member of the genus. This new record also fills in a major gap in the distribution
of the genus in the regions of the Albertine and Malawi Rifts. There are no
published records in the region between 3o05’S (just north of Lake Tanganyika)
and 14o30’S (south of Lake Malawi). This void includes the countries of Angola,
Zambia, Malawi, Democratic Republic of Congo (SE), Tanzania (W), and
Zimbabwe (N).
Keywords: Myosorex, shrew, new species, Albertine Rift, Malawi Rift
20
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
INTRODUCTION
The genus Myosorex has a relict distribution in eastern and central Africa as the 9 member
species are found exclusively in isolate montane zones (1140–4000 m) in eastern and Central
Africa (nine species). The sole exception is a specimen of M. geata (Allen & Loveridge,
1927) collected by Loveridge at Vituri (ca. 610 m), Uluguru Mountains, Tanzania. The
genus does occur in lower elevation habitats at southern latitudes [five species within
southern Africa; summarized in Hutterer (2005)]. Until recently, only two localities for the
genus had been documented between 3oS and 18oS (figure 1). The first was M. geata from
the Uluguru Mountains of central Tanzania (Allen & Loveridge, 1927). The second was an
undocumented record of M. cafer (Sundevall, 1846) from Tete District, Mozambique
(Smithers & Tello, 1976), but that specimen(s) cannot be confirmed as its whereabouts is not
known. Stanley and Hutterer (2000) recently described M. kihaulei (Stanley and Hutterer,
2000)from the Udzungwa Mountains of central Tanzania (ca. 8oS), and Stanley et al. (2005a)
described a related Myosoricine (Congosorex phillipsorum) Stanley et al 2005a), also from
the Udzungwa Mountains. However, none of these forms are known from the Albertine or
Malawi Rifts. Here we report on a newly collected specimen from Nyika National Park,
northern Malawi at ca. 10o35’S. The distinctive characters of this specimen enable us to
describe it as a species new to science.
Description of the study area
Nyika National Park, centered on 10°33’S and 33°50’E, lies in northern Malawi and was
declared Malawi’s first national park in 1965. After expanding to 3134 km2 in 1978, it
became the largest National Park in Malawi. As part of the Malawi Rift, the plateau
component of the National Park comprises the ‘largest montane complex in south-central
Africa’ (Dowsett-Lemaire, 1985), with some 1800 km2 above 1800m. This specimen was
captured on the central plateau within the Park. The habitat of the plateau is dominated by
rolling Loudetia-Andropogon grassland with scattered patches (2–3% of total area) of forest,
many of which are centered on small streams and valleys (Chapman & White, 1970;
Dowsett-Lemaire, 1985). A few relict patches of juniper (Juniperus procera Endl.) persist.
Only the wet eastern escarpment, overlooking Lake Malawi, supports moist forest (FicalhoaOcotea). Additional habitats include dambos (seasonally inundated, shallow wetlands on the
plateau) and patches of stunted, broad-leaf, woodland with typical height of only 7.5–9.0 m
(Von der Heyden, 2004).
At one time, montane evergreen forest was the dominant vegetation community but, due
to fires, the extensive forests were heavily impacted and reduced. Evidence from Chilinda
suggests that severe fires occurred between 9800 and 4900 years B.P. resulting in extensive
forest destruction (Shroder, 1976; cited in Dowsett-Lemaire, 1985). Increased human impact
prevented forest regeneration resulting in vegetation dominated by fibrous peat (product of
sedges, reeds and grasses). A further contributing element to forest destruction was a
tradition of prehistoric iron-smelting, evidenced by scattered smelting stations, creating a
need for fuel wood (Cater, 1954; Rangley, 1960). Cater notes that ‘nyika’ means ‘to burn
well’ in the local Tumbuka language. The Plateau appears never to have been permanently
inhabited (Chapman & White, 1970; Dowsett-Lemaire, 1985) since the soils are not
conducive to growing crops (Chapman & White, 1970). Henderson (1900) provides one of
the earliest accounts of the plateau: ‘There is no forest of any kind, only grass veldt with
mean scrub in the hollows’. Fires continue to have a major impact today. The presence of
endemic taxa of francolin (Scleroptila levaillantii crawshayi Ogilvie-Grant, 1896), weaver
First record of Myosorex from Malawi with description as a new species
21
(Ploceus baglafecht nyikae Benson, 1938), babbler (Illadopsis pyrrhoptera nyasae Benson,
1939), and lark (Mirafara
Figure 1. Distribution of documented Myosorex taxa across afromontane habitats in the Eastern
Arc, Albertine Rift, and Malawi Rift, showing the intermediate locality of Myosorex gnoskei.
africana nyika Benson, 1939) hint at the long-term persistence of these grasslands (Benson,
1953; Meadows, 1984). In his review of geomorphology, sediments and soils, Meadows
(1984) concludes by stating that the current vegetation regime on the Nyika predates the
arrival of man ca. 12 000 years ago.
Exotic conifers (Pinus patula Schltdl. & Cham.) and Eucalyptus spp. were established by the
Malawi Forest Department prior to the Park’s gazetting. Today, the only maintained exotic plot is
the 1200 ha forest adjacent to Chilinda Camp, the base of operation during the capture of the new
22
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
species. Mean monthly temperatures at Chilinda range between 11oC (June–July) with occasional
night frosts, and 16oC in November–December (Dowsett-Lemaire, 1985). Easterly winds can be
especially cold in July–August. Mean annual rainfall near the Chilinda Camp is 1160 mm (793–
1589 mm) with a single rainy season between November and April (inclusive).
MATERIALS AND METHODS
Rodents and shrews in the Chilinda Dam locality were sampled using snap traps and a pitfall
line. Three traplines each consisted of 20 Museum Specials (17.5 by 8.5 cm) and 10 Victor
Rat traps, were set along a 150 m transect. Pitfalls consisted of 11 buckets, separated at 10
meter intervals. Plastic sheeting, 0.5 m high and buried several centimeters, served as a drift
fence between buckets. Buckets were 30 cm in height, with a diameter of 24.5 cm at the
bottom and 28.8 cm. at the top. Thirty Victor (17.5 x 8.5 cm) and Museum Special traps (14
x 7 cm) were set along a 150 m transect. The traps were baited with peanut butter. One
hundred and nine rodents and shrews were collected during 674 trap nights for a trap success
of 16.2%. Field work at the site was conducted between June 21 and June 30, 2004. No rain
fell during the field season.
External measurements were recorded on the fresh carcass in the field by LM with a ruler
(to the nearest mm). These included: total length (Tot), tail vertebrae (Tail), hind foot including
claw (HF), length of ear from notch (Ea), and weight (Wt) in grams. Head and body length
(HB) was obtained by subtracting Tail from Tot. Flesh from the thigh was preserved in buffer
(DMSO) for genetic studies (Seutin et al., 1991). In the field, specimens were fixed in
formalin; upon arrival at the Field Museum of Natural History (FMNH), they were transferred
to 75% ethanol. Measurements of Tail, HF and Ea were repeated by JKP at the FMNH
approximately 2 months later with the use of a digital caliper (to the nearest 0.01 mm) and a
binocular microscope. Differences between field measurements and those undertaken in lab are
most likely due to the osmotic properties of the alcohol and the associated shrinkage it induces.
Cranial-dental measurements generally follow Dippenaar (1977). These include: condyloincisive length (CI), upper tooth row length (UTR), maxillary breadth (MB), greatest braincase
width (GW), height of cranial capsule (HCC), least interorbital width (IO), mandible and
incisor length (MD), lower tooth row length (LTR), breadth across post-glenoid processes
(PGL), and minimal height of the coronoid process of mandibular ramus (COR).
With the exception of the type (and only specimen) of M. schalleri (Heim de Balsac, 1966), only
adult specimens were included in the analyses. Adulthood was determined on the basis of the fusion
of the basioccipital-basisphenoid suture. A list of specimens examined is presented in the Appendix.
Acronyms for museum collections used in this report are: AMNH, American Museum of
Natural History, New York; FMNH, Field Museum of Natural History, Chicago; MNHN,
Museum National d’Histoire Naturelle, Paris; TRP, Tanzanian Rodent Program, University
of Antwerp; and ZFMK, Zoologisches Forschungsmuseum Alexander Koenig, Bonn.
MLWM= Malawi Mammal Number (original field number). For the map (figure 1),
localities of Myosorex in Mozambique were estimated from Smithers & Tello (1976, p. 31),
and for Zimbabwe they were taken as the center of the squares depicted in Smithers &
Wilson (1979, p. 18). Coordinates of the type locality of the new species were taken with a
hand-held Magellan ‘Color Trak’ GPS. In the Appendix (Specimens Examined) “5M, 3F, 1?”
refers to five males, three females, and one unsexed specimen. Reference to ‘unicuspids’ and
dental nomenclature follows Hutterer & Schlitter (1996). Taxonomy follows Hutterer (2005).
First record of Myosorex from Malawi with description as a new species
23
SPECIES DESCRIPTION
The Nyika burrowing shrew. Myosorex gnoskei n. sp.
Holotype
FMNH 191568, original number MLWM 133, adult female, dentition well worn, fluidpreserved specimen (70% ethanol). The skull was removed and preserved as a skeletal
preparation at the Field Museum of Natural History in late August, 2004. Some damage to
left side of basicranium. Collected on 30 June, 2004, by the Malawi Mammal Team (L.
Mazibuko and N. Gawami) led by P. Kaliba. Specimen was retrieved from a Museum
Special mouse trap with peanut butter as bait.
Type locality and Distribution
Known only from the type locality (figure 1). The trapping station was 200 m north of the
Chilinda Guest House within Nyika National Park, Malawi (10o34’37”S, 33o48’30”E, 2285 m).
Etymology
The specific epithet honours Mr. Thomas Gnoske in recognition of his important
contributions to the knowledge of African vertebrates, particularly birds and mammals. His
skills in the field and as a preparator are only matched by his personal skills, especially his
engagement and commitment to host country collaborators.
Diagnosis
Size small for a member of the genus (body mass, 8 g, CI=20.47 mm). Pelage tricolored,
resulting in a mottled appearance. Tail bicolored. An exceptionally narrow-skulled member
of the genus, as reflected in the reduced MB (6.1 mm) and GW (9.9 mm). Interparietal bone
about twice as wide as long. Upper 4th unicuspid very large (3/4 the size of the second upper
unicuspid), visible in lateral view and clearly separating upper 3rd unicuspid from upper P4.
Upper third unicuspid equal in size to upper first unicuspid. Upper M3 very large and long.
Lower P2 large and visible in medial view.
Description.
Pelage mottled (tri-colored) with brownish appearance. On dorsum, individual hairs 7.0 mm
long. Each hair composed of a 5.5 mm slate grey base followed by a ca. 1.0 mm yellowish
band, terminating in a ca 0.5 mm dark brown tip. Belly fur bicolored. Individual hairs from
base up to 85% of length slate grey, with yellowish tips on remainder. Tail of moderate
length (52% HB); long bristle hairs absent. Tail thin and noticeably bicolored, dark brown
hairs above, blond hairs below. Claws short (forefoot=2.4 mm, hindfoot=1.9 mm). Manus
and pes lighter in appearance on medial aspect due to less dense fur. Teats appear to be
curiously set into inguinal ‘pockets’. They may be anomalous in number (two on the left
side, none visible on the right side) as the species is known only by the holotype.
Body small (8 g), skull small (CI=20.47 mm). Skull long with a slender rostrum.
Braincase (9.9) and maxilla (6.1) narrow. Dorsal profile of braincase slightly domed (figure
2). Interparietal bone (sensu Heim de Balsac and Lamotte, 1956) twice as wide as long
(figure 3), the posterior suture being partly fused with the occipital. Upper 4th unicuspid very
large (3/4 the size of the second upper unicuspid) and visible in lateral view; fully involved
in tooth row (figure 4). The upper 4th unicuspid clearly separates upper 3rd unicuspid from
upper 4th premolar. Upper 3rd unicuspid sub-equal in size to upper 1st unicuspid. Upper P4
lightly built with expansive posterior concavity (figure 4) between metastyle and talonid;
parastyle long and hook-like in lateral view (figure 3). Upper M1 and M2 also lightly built
with large vacuities. Upper M3 very long and heavily built. One small anterior lateral
(foramen vasculaire = sinus canal foramen of Meester 1963, Fig. 12) and one small
posterior medial (basisphenoid fenestration) post-pterygoid foramina present (Gasc, 1963).
24
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
Figure 2. Skull of the holotype of Myosorex gnoskei n. sp. (FMNH 191568) in dorsal, ventral,
and lateral views.
First record of Myosorex from Malawi with description as a new species
25
Figure 3. Interparietal bone (left) and Upper P4 (right, in lateral view) of (a) Myosorex gnoskei n.
sp. (holotype), (b) M. geata, (c) M. kihaulei, and (d) M. varius (Thomas, 1906).
Two denticulations to lower incisor. Lower P2 relatively large and visible in medial view.
Lower P4 almost as wide as long, cutting surface with the V-pattern, typical in myosoricine
shrews. Lower M3 very long. Large gap between M3 and ascending ramus. Mandibular
ramus vertically shallow. Posterior hook to ascending ramus of mandible. Lightly built and
concave articular facet to the glenoid process of the mandible.
26
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
Figure 4. Upper tooth row of the holotype Myosorex gnoskei n. sp. (FMNH 191568), showing
the large upper fourth unicuspid (U4) that is fully involved in the tooth row, the posterior
concavity of the upper P4, and the large upper M3. First incisor (I1) to the left, third upper molar
(M3) to the right.
Comparisons
Myosorex gnoskei is easily distinguished from its congeners by a combination of a short tail,
a large and distinctively shaped M3, and a narrow skull (GW and MB). Due to its small
cranial size (CI=20.47), the specimen needs comparison only with congeners with a CI
below 22.0: M. babaulti (Heim de Balsac and Lamotte, 1956), M. geata, M. kihaulei,
M. schalleri, and M. tenuis (Thomas & Schwann, 1905).
Myosorex gnoskei is readily distinguished from M. babaulti by its tri-colored dorsal fur,
longer tail, and short and narrow skull (CI, GW, MB) with shorter tooth rows (UTR, LTR).
The short claws, tri-colored pelage, and narrow skull align M. gnoskei most closely with
M. geata and M. kihaulei. Smaller mensural characters distinguish M. gnoskei from M. geata
(table 1), especially its narrower skull (MB, PGL and GW), lower skull height (HCC),
shorter tooth rows, and much smaller upper incisor whilst boasting a much larger upper 4th
unicuspid and upper M3 (figure 2). Its upper 3rd unicuspid is elongate compared to the more
square-like dimension seen in the corresponding tooth of M. geata. Some specimens of M.
kihaulei are actually smaller than M. gnoskei in several cranial dimensions (e.g., CI, UTR
and COR); however, the narrower skull and lower cranial vault, reflected in MB, GW, PGL,
and HCC distinguish M. gnoskei (table 1). The minimum measurement for GW in M.
kihaulei males (9.67 mm, table 1) reported by Stanley & Hutterer (2000) was done so in
error (Stanley, personal comm.); no available specimens of M. kihaulei have a GW of less
than 10.26 mm. In addition, M. gnoskei has a narrower and longer upper 3rd unicuspid, the
4th is substantially larger and fully involved in the UTR and its upper M3 is longer.
Comparisons with M. schalleri are difficult because this taxon is represented solely by the
type specimen, a juvenile. A soricid of young age will typically have a more narrow MB and
a shorter CI (pers. obs.). M. gnoskei is distinguished from M. schalleri by its shorter tail and
mottled pelage. M. schalleri is dull black in color both dorsally and ventrally. M. gnoskei has
a much taller coronoid (COR), longer and broader skull (CI, GW and MB), a very large
upper 4th unicuspid, and the parastyle of the P4 is much better developed. Both species share
the wide and short interparietal (table 1, figure 3).
M gnoskei is distinguished from M. tenuis by its mottled tri-colored dorsal fur. This
contrasts against the ‘warm dark bistre brown… approaching black in some specimens’
described by Thomas & Schwann (1905, p.131) for M. sclateri, a character similarly
First record of Myosorex from Malawi with description as a new species
27
diagnostic of M. tenuis. M. gnoskei is significantly smaller in all absolute cranio-dental length
dimensions than M. tenuis (CI 20.47 vs. 21.7 and UTR 8.58 vs. 9.5) except for GW (9.91 vs
10.2 in M. tenuis); an important difference in shape. Moreover, M. tenuis is only known from
south of the Zambezi River. Further documentation of M. tenuis is still needed through
surveys, specimens, descriptions, morphometrics, and illustrations (such as for the M3).
Table 1 External and cranio-dental measurements for five species of Myosorex. External
measurements (in mm) include: total length (Tot), head and body length (HB), tail vertebrae
(Tail), hind foot including claw (HF), length of ear from notch (Ea), length of fore claw (Fclaw)
and length of hind claw (Hclaw), and weight (Wt) in grams .
Species
gnoskei1
gnoskei2
schalleri3
4
geata
kihaulei4
N
1
1
1
6
10
Tot
114
HB
75
113
116
52.5
72
76.3
Tail
41
37
44
41
40.7
HF
14
13
12
13.2
12.8
Ea
9
8
7.15
8.6
Wt
8
Tail/HB
54.7%
9.35
9.5
83.8%
57%
54%
Fclaw2
Hclaw2
2.4
1.9
2.43
2.28
2.04
1.99
Cranio-dental measurements (in mm) include: condylo-incisive length (CI), upper tooth row
length (UTR), maxillary breadth (MB), greatest braincase width (GW), height of cranial capsule
(HCC), breadth across post-glenoid processes (PGL), least interorbital width (IO), mandible and
incisor length (MD), lower tooth row length (LTR), and minimal height of the coronoid process of
mandibular ramus (COR).
Species
schalleri3
gnoskei
geata4
kihaulei4
geata,
range4
n
1
1
6
10
6
CI
18.9
20.47
20.89
20.26
20.6621.12
UTR
8.4
8.58
9.06
8.65
8.929.19
MB
5.4
6.08
6.44
6.38
6.356.56
GW
8.3
9.91
10.54
10.40
10.3210.69
HCC
5.9
6.1
6.60
6.44
6.346.75
PGL2
6.65
7.16
6.92
6.987.39
IO
4.4
4.19
4.42
4.24
4.234.58
MD
12.52
13.06
12.61
12.9713.2
LTR
7.9
7.76
8.22
7.91
8.108.32
COR2
4.2
5.15
5.37
5.11
5.285.46
kihaulei,
range4
10
19.6720.85
7.998.99
6.256.50
9.91*10.75
6.266.58
6.767.02
4.064.50
12.1912.85
7.278.32
4.965.33
1
original field measurements by LM Mazibuko
measurements taken at FMNH by JKP
3
measurements of M. schalleri taken from the type by RH
4
measurements averaged from males/females from Stanley & Hutterer (2000)
* see text for explanation
2
Affinities
The affinities of M. gnoskei are difficult to ascertain. A narrow skull and tri-colored, mottled
pelage are shared by M. geata, M. kihaulei, and M. gnoskei. These three taxa are distributed
from central Tanzania south to northern Malawi. Yet, a slender upper P4 with a long
parastyle, and a wide interparietal bone (figure 3) are only shared by M. gnoskei and
M. schalleri. Based on the configuration of the cranial capsule, Heim de Balsac (1967) called
the latter species the most primitive member of the genus. The more oval shape of the skull
(rather than hexagonal), the large in-line 4th upper unicuspid, the small claws, and the welldeveloped ears (9 vs. 5–6 mm) suggest that M. gnoskei is a primitive member of the genus
(see Heim de Balsac & LaMotte, 1956; Heim de Balsac, 1967) since it is a less specialized
burrower. It would also be instructive to compare M. gnoskei with the nearest Myosorex to
28
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
the south, recorded by Smithers & Tello (1976) from Mozambique at ca. 14o30’ S;
unfortunately, we have been unable to determine the institution where this specimen was
deposited.
Ecology
Myosorex gnoskei is known only from the type locality. It is evidently uncommon, or else
only seasonally active, as it was not encountered in several previous collecting efforts at this
locality. This specimen was collected in a snap trap, not a pitfall line, indicating that it can be
trapped using such time-honored collecting techniques; its absence from previous surveys is,
therefore, puzzling.
The single specimen was retrieved early in the morning which suggests nocturnal activity,
typical for the genus. Species composition of the small mammal community is presented in table 2.
This assemblage includes an undescribed species of Dendromus (Kerbis Peterhans et al., in prep).
The M. gnoskei specimen was collected within the premises of Chilinda Parks and Wildlife
Camp, in shrub thickets (heathland including Helichrysum whyteanum, Britten. (Asteraceae)) and
bracken fern along a shallow stream about 200 m north of the Chilinda Rest House. This area has
pine plantations (Pinus patula) on the eastern and western sides separated by a valley with a
perennial river. The river is impounded ca. 1 km downstream of the collection locality. Dominant
plant species include sedges (Cyperaceae), bracken fern Pteridium aquilinum, (L.) Kuhn.
(Dennstaedtiaceae) and evergreen shrubs. Other plants collected on the plateau by the research
team include: Lobelia baumannii Engl. (Lobeliaceae), Hypericum revolutum Vahl.
(Hypericaceae), Hypericum peplidifolium A.Rich (Hypericaceae), Rumex abyssinicus Jacq.
(Polygonaceae), Asplenium aethiopicum (Burm.f.) Becheres. (Aspleniaceae), Panicum maximum
Jacq. (Poaceae), Carex conferta A.Rich var. lycurus (K.Schum) Lye. (Cyperaceae), Sonchus
asper (L.) Hill (Asteraceae), Anthospermum usambarense K.Schum (Rubiaceae), Dryopteris
athamantica (Kunze) Kuntze (Dryopteridaceae).
Table 2. Small mammal fauna collected at the Chilinda Dam Site, Nyika National Park, Malawi
(June 21–30, 2005)
Soricomorpha - Soricidae
Crocidura hildegardeae (Thomas, 1904)
Crocidura nigrofusca (Matschie, 1895)
Crocidura olivieri (Lesson, 1827)
Myosorex gnoskei (this study)
Suncus megalura (Jentink, 1888)
Rodentia - Muridae
Dendromus nyasae (Thomas, 1916)
Dendromus nov. sp.
Lophuroms Aquiles (True, 1892)
Aethomys chysophilus, (de Winton, 1897)
Aethomys nyikae (Thomas, 1897)
Grammomys dolichurus (Smuts, 1832)
Grammomys ibeanus (Osgood, 1910)
Mus triton (Thomas, 1909)
Otomys c.f. denti sungae (Bohmann, 1943)
Otomys udzungwensis (Lawrence and Loveridge, 1953)
Rhabdomys dilectus (de Winton, 1897)
1
1
1
1
2
3
2
34
2
2
2
1
15
2
3
55
First record of Myosorex from Malawi with description as a new species
29
DISCUSSION
The occurrence of M. gnoskei on the Nyika Plateau is typical of the distribution of Myosorex,
which is endemic to disjunct high plateaus and mountain tops in afrotropical latitudes:
M. blarina (Thomas, 1906) from Rwenzoris, Uganda and DR Congo (1960–4000 m, Kerbis
Peterhans et al. 1998), M. babaulti from Bwindi-Impenetrable National Park, Uganda (1850
m, FMNH), and Virunga Volcanos (3100 m, Uganda & DRC, FMNH, Misonne, 1963),
Kibira National Park, Burundi (2100 m, FMNH), Kahuzi-Biega National Park, DR Congo
(1950–2100 m, AMNH); M. eisentrauti (Heim de Balsac 1968) from Bioko Island (2000–
2400 m), Equatorial Guinea; M. geata from Uluguru Mountains, Tanzania [2,000’ (610 m)
and 7,500’(2290 m)], Allen & Loveridge, 1927; 1345–1535 m, Stanley & Hutterer, 2000);
M. kihaulei from Udzungwa Mountains (1460–2000 m; Stanley & Hutterer, 2000),
M. okuensis (Heim de Balsac, 1968) from Bamenda Plateau (1800–2100 m), Cameroon;
M. rumpii (Heim de Balsac, 1968) from Rumpi Hills (1100 m), Cameroon; M. schalleri
from Nzombe, Itombwe Forest, DR Congo (ca. 1664 m, Heim de Balsac, 1967), and
M. zinki (Heim de Balsac & Lamotte, 1956) from Mount Kilimanjaro, Tanzania (2470–4000 m,
Stanley et al., 2005b). Perhaps their specialized, semi-fossorial, foraging habits (reflected in
their long-claws, wedge-shaped skulls, generally reduced tail and ears) have enabled this
group to survive the competition posed by the relatively recent radiation of the more derived
Crocidura. By contrast, the southern African members are distributed at lower elevations
(reviewed in Smithers, 1983) but, due to their greater latitudinal distance from the equator,
are found in more temperate environments.
The new species was discovered in an area that had been frequently surveyed.
Historical expeditions were summarized by Benson (1953). The Nyika Plateau was first
surveyed for small mammals in 1896 by Alexander Whyte (Thomas, 1898), followed by
McLounie and/or Sharpe in 1902. There seems to have been a hiatus in vertebrate surveys
until Arthur Loveridge’s expedition in 1948 (Lawrence & Loveridge, 1953) followed by
Hanney (1962, 1965). More recent surveys of the Nyika Plateau include those described by
Overton and Nursaw (1972), Happold & Happold (1989), and Chitaukali et al. (2001). In
1985, Happold & Happpold (1989) surveyed the very locality (Chilinda Dam) that we
report on here. Our results indicate the role of serendipity in comprehensive species
documentation; multiple surveys are necessary in order to fully document the small
mammal fauna of a given area.
ACKNOWLEDGMENTS
This work was possible because of the assistance accorded to us by the Department of
National Parks and Wildlife in Malawi, especially for certifying the implementation of the
project in Nyika National Park. The National Research Council of Malawi provided
permission to conduct research. The Museums of Malawi and Field Museum of Natural
History (Chicago) are collaborating institutions for the project. We thank the following
colleagues for working tirelessly during data collection, N.B. Kalimira (NMM), N.H.
Gawani (NMM), Dr. D. Willard (FMNH), and T.P. Gnoske (FMNH). The original
collaboration was arranged by Dr. G. Voelker of the University of Memphis. Dr. J. Bates
(Chair, Zoology, Field Museum of Natural History) provided essential support during the
formative and following stages of the FMNH/Malawi program. We acknowledge the African
Council of the Field Museum for the sponsorship of field activities and for the funding of PK
30
J.C. Kerbis Peterhans, R. Hutterer, P. Kaliba & L. Mazibuko
to come to Chicago to prepare this manuscript, and Roosevelt University for providing
assistance for JKP to work in Germany with RH. D. Rohwedder (ZFMK) took the
photographs of the holotype and U. Vaartjes improved figures 2 to 4. S. Bober prepared the
map (figure 1). H. Beentje provided the identification of Asteraceae at the type locality.
W.T. Stanley (FMNH), E. Sarmiento, T. Butynski and one anonymous reviewer provided
important commentary on the manuscript. G.G. Musser (AMNH), M. Tranier (MNHN), and
the late W. Verheyen (TRP) provided access to critical comparative materials.
REFERENCES
Allen, G.M. & A. Loveridge (1927). Mammals from the Uluguru and Usambara Mountains,
Tanganyika Territory. Proceedings of the Boston Society of Natural History 38(9): 413–441.
Benson, C.W. (1953). Nyasaland and Northern Rhodesia: The Nyika Plateau and its faunistic
significance. Oryx 2(3): 158–164.
Cater, J.C. (1954). The Nyika Plateau, Nyasaland. Oryx 2(5): 298–302.
Chapman, J.D. & F. White (1970). The Evergreen Forests of Malawi. Commonwealth
Forestry Institute, Oxford.
Chitaukali, W.N., H. Burda, & D. Kock (2001). On small mammals of the Nyika Plateau,
Malawi. In C. Denys, L. Granjon & A. Poulet (eds.), African Small Mammals.
Proceedings of the 8th International Symposium on African Small Mammals, Paris, July,
1999. Institute de Recherché pour le Development, Paris. Pp. 415–426.
Dippenaar, N.J. (1977). Variation in Crocidura mariquensis (A. Smith, 1844) in southern
Africa, Part1 (Mammalia: Soricidae). Annals of the Transvaal Museum 32:1–34.
Dowsett-Lemaire, F. (1985). The forest vegetation of the Nyika Plateau (Malawi-Zambia):
ecological and phenological studies. Bulletin du Jardin Botanique National de Belgique
55: 301–392.
Gasc, J.P. (1963). Sur une fenestration de la base du crane chez les especes de petite tailler
du genre Suncus Ehrenberg. Mammalia 27: 81–91.
Hanney, P. (1962). A preliminary report on the rodents of the Nyika Plateau. Annual Report
& Bulletin of the Nyasaland Museum 1961–1962: 28–33.
Hanney, P. (1965). The Muridae of Malawi (Africa: Nyasaland). Journal of Zoology
146: 577–633.
Happold, D.C.D. & M. Happold (1989). Biogeography of montane small mammals in
Malawi, Central Africa. Journal of Biogeography 16: 353–367.
Heim de Balsac, H. (1967). Faits nouveaux concernant les Myosorex (Soricidae) de l’Afrique
orientale. Mammalia 31: 610–628.
Heim de Balsac, H. (1968). Étude des Soricidae de Fernando Po et du Cameroun. Bonner
Zoologische Beitrage 19(1/2): 20–29.
Heim de Balsac, H. & M. Lamotte (1956). Evolution et phylogénie des Soricidés africains.
Mammalia 20: 140–167.
Henderson, J. (1900). Northern Nyasaland. Scottish Geographical Magazine 16: 82–89.
Hutterer, R. (2005). Order Soricomorpha. In Mammal Species of the World. Third Edition.
D.E. Wilson & D.M. Reeder (eds.) Johns Hopkins University Press, Baltimore.
Hutterer, R. & D.A. Schlitter (1996). Shrews of Korup National Park, Cameroon, with the
description of a new Sylvisorex (Mammlia, Soricidae). In Contributions in Mammalogy: A
Memorial Volume Honoring Dr. J. Knox Jones, Jr. Museum of Texas Tech University,
Texas. Pp.57–66.
First record of Myosorex from Malawi with description as a new species
31
Kerbis Peterhans, J.C., R.M. Kityo, W.T. Stanley & P.K. Austin (1998). Small mammals
along an elevational gradient in Rwenzori Mountains National Park, Uganda. In
H. Osmaston, J. Tukahirwa, C. Basalirwa, & J. Nyakaana (eds.), The Rwenzori Mountains
National Park, Uganda. Exploration, Environment & Biology. Conservation, Management
and Community Relations. D.K. Printworld (P) Ltd., New Delhi. Pp. 149–171.
Lawrence, B. & A. Loveridge (1953). No. 1- Zoological results of a fifth expedition to East
Africa. I. Mammals from Nyasaland and Tete, with notes on the genus Otomys. Bulletin
of the Museum of Comparative Zoology, Harvard University 110(1): 1–80.
Meadows, M.E. (1984). Past and present environments of the Nyika Plateau, Malawi.
Palaeoecology of Africa and the Surrounding Islands 16: 353–390.
Meester, J. (1963). A systematic revision of the shrew genus Crocidura in Southern Africa.
Memoirs of the Transvaal Museum 13: 1–126.
Misonne, X. (1963). Présence de Myosorex blarina dans la chaine des volcans du Kivu.
Mammalia 27: 443–444.
Overton, C.P. & J. Nursaw (1972). Small Mammal Report. Unpublished report. Wye
College Report on the Nyika Expedition. London, Wye College pp. 105–119.
Rangley, W.H.J. (1960). Ancient iron workings in the Nyika Plateau. Nyasaland Journal
13: 18–20.
Seutin, G, B.N. White & P.T. Boag (1991). Preservation of avian blood and tissue samples
for DNA analysis. Canadian Journal of Zoology 69: 82–90.
Shroder, J.F. (1976). Mass movement on Nyika Plateau, Malawi. Zeitschrift fuer
Geomorphologie NF 20: 56–77.
Smithers, R.H.N. (1983). The Mammals of the Southern African Subregion. University of
Pretoria, Pretoria.
Smithers, R.H.N. & J.L.P. Tello (1976). Check List and Atlas of the Mammals of
Mozambique. Museum Memoir No. 8. Trustees of the National Museums and
Monuments of Rhodesia, Salisbury.
Smithers, R.H.N. & V.J. Wilson (1979). Check List and Atlas of the Mammals of Zimbabwe
Rhodesia. Museum Memoir No. 9. Trustees of the National Museums and Monuments of
Rhodesia, Salisbury.
Stanley, W.T. & R. Hutterer (2000). A new species of Myosorex Gray, 1832 (Mammalia:
Soricidae) from the Eastern Arc mountains, Tanzania. Bonner Zoologische Beitrage
49(1–4): 19–29.
Stanley, W.T., M.A. Rogers, & R. Hutterer (2005a). A new species of Congosorex from the
Eastern Arc Mountains (Tanzania), with significant biogeographical implications. Journal
of Zoology (London) 265: 269–280.
Stanley, W.T., M.A. Rogers & R. Hutterer (2005b). A morphological assessment of
Myosorex zinki, an endemic shrew on Mount Kilimanjaro. Belgian Journal of Zoology
135 (supplement): 141–144.
Thomas, O. (1898). On the mammals obtained by Mr. A. Whyte in Nyasaland, and
presented to the British Museum by Sir HH Johnston, KCB; being a fifth contribution to
the mammal-fauna of Nyasaland. Proceedings of the Zoological Society of London
1897: 925–939.
Thomas, O. & O. Schwann (1905). The Rudd exploration of South Africa.-II. List of
mammals from the Wakkerstroom District, Southeast Transvaal. Proceedings of the
Zoological Society of London 1905: 129–138.
Von der Heyden, C.J. (2004). The hydrology and hydrogeology of dambos: a review.
Progress in Physical Geography 28: 544–564.
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Appendix 1: Specimens Examined
Myosorex babaulti: BURUNDI, Kibira NP, FMNH 148937 1M, 148938 1M, 148265 1M, 21002350 m; DR CONGO, Kahuzi-Biega NP, Tshibati, FMNH 189275 1M, ZFMK 68.545, 1F, Lwiro
Falls, 2100 m, AMNH 180956-180961, 6M; UGANDA, Bwindi-Impenetrable NP, 1850 m, FMNH
160175 1M, Mgahinga Gorilla NP, 2980 m, FMNH 157410 1M. Myosorex blarina: DR CONGO,
Rwenzori Mountains, FMNH 26285-26287 2M, 1F; UGANDA, Rwenzori Mountains NP, 144205144211, 2M, 4F, 1?, 1900 m-3980 m. Myosorex geata: TANZANIA, Uluguru Mountains, Uluguru
North Forest Reserve 1345-1535 m, FMNH 158298-158302, 158487 3M, 3F, Mbete, TRP 2305.
Myosorex kihaulei:
TANZANIA, Udzungwa Mountains, New Dabaga/Ulangambi Forest
Reserve, 1816-1940 m, FMNH 169509-169516, 1?, 7F; West Kilombero Scarp Forest Reserve,
1140 m, FMNH 169501, 1?. Myosorex schalleri: DR CONGO, Itombwe Forest, area of Nzombe,
ca. 1664 m (www.geonames.org), MNHN 1981-1107, M. Myosorex varius R. SOUTH AFRICA,
Goodhope Estate 1425-1500 m, 165628 1M, 165588-165592, 1M, 3F, 1?, 165623-165627,
165667, 4F, 1M, 1?, Cape Province, ZFMK 82.135, 1F.