Crocidura negligens, Robinson & Kloss, 1914

Russell A. Mittermeier & Don E. Wilson, 2018, Soricidae, Handbook of the Mammals of the World – Volume 8 Insectivores, Sloths and Colugos, Barcelona: Lynx Edicions, pp. 332-551 : 475

publication ID 10.5281/zenodo.6870843


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Crocidura negligens


227. View Plate 20: Soricidae

Peninsular White-toothed Shrew

Crocidura negligens View in CoL

French: Crocidure péninsulaire / German: Halbinsel-WeilRzahnspitzmaus / Spanish: Musarana de Malaca

Other common names: Peninsular Shrew

Taxonomy. Crocidura negligens H. C. Robinson & Kloss, 1914 View in CoL ,

Kho Samui , just off Peninsular Thailand.

Apparently most closely related to C. ab- scondita of West Java or, more likely, to C. malayana of Peninsular Malaysia. Includes maporensis and tionis as synonyms. Formerly included in C. fuliginosa or in C. attenuata , but differs chromosomally, genetically, and morphologically. Distinction from C. malayana of Peninsular Ma-

laysia and C. negligens of Tioman Island rests on slight differences in skull shape and on one diagnostic allozyme locus, and also on shallow (1%) sequence divergence at the cytochrome-b gene; the two might therefore be conspecific, but comprehensive studies focusing on possible areas of sympatry (Pahang) are needed to test the specific status of C. negligens . Monotypic.

Distribution. Islands off peninsular Thailand (Koh Samui) and Peninsular Malaysia (Tioman, and Mapur); one old specimen from Mt Tahan, Pahang State, Malaysia,

might also belong to this species, but no recent confirmation of this taxon on the Malay Peninsula cast doubts about the existence of such a continental population of Peninsular White-toothed Shrew. View Figure

Descriptive notes. Head-body 75-92 mm, tail 55-69 mm, ear 8-10 mm, hindfoot 13-5-15-8 mm; weight 9-5—12-5 g. The Peninsular White-toothed Shrew is a medium-sized, grayish brown shrew with a relatively short tail (c.80% of head-body length). Few long bristle hairs present on the proximal 10-20 mm oftail. Dorsal hairs with deep neutral gray bases and brown tips; ventral pelage slightly lighter gray and usually tinged with chestnut. Skull with globose braincase and relatively small dimensions when compared to continental Malayan White-toothed Shrew ( C. malayana ) or Southeast Asian Whitetoothed Shrew ( C. fuliginosa ). Chromosomal complement has 2n = 38 and FN = 64, with submetacentric X and Y chromosomes. Chromosomal complementis very similar to that of the Malayan White-toothed Shrew but distinct from the Southeast Asian White-toothed Shrew (2n = 40, FN = 54-58).

Habitat. On Tioman Island, the Peninsular White-toothed Shrew has been caught near sea level in anthropogenic prairies of Imperata cylindrica ( Poaceae ) and along the edges of secondary tropical rainforests.

Food and Feeding. Peninsular White-toothed Shrews feed on invertebrates; the species has been maintained for a few days in captivity on a diet of grasshoppers and meal worms.

Breeding. A pregnant female carried three fetuses and had three pairs of nipples near the cloacal region.

Activity patterns. On Tioman Island, the Peninsular White-toothed Shrew was caught during the night during 24hour trapping sessions, suggesting predominantly nocturnal bouts of activity.

Movements, Home range and Social organization. Population densities may be locally high in disturbed habitats such as agricultural landscapes on Tioman Island, but there are no data on home range or social organization. Other terrestrial mammals caught in the same habitat included Short-tailed Gymnures ( Hylomys suillus), Pacific Rats ( Rattus exulans) and Malaysian Field Rats (R. tiomanicus).

Status and Conservation. Classified as Least Concern on The IUCN Red List in view of its presumed wide distribution and high degree of tolerance to habitat degradation. However, as recent sightings are restricted to a few small islands with heavy tourist pressure,its status might need to be revised owing to the potential vulnerability ofits habitat in the face of anthropogenic development.

Bibliography. Demos et al. (2016), Esselstyn & Brown (2009), Hutterer (2005b), Kloss (1917b), Robinson (1916), Robinson & Kloss (1914), Ruedas (2016), Ruedi (1995), Ruedi & Vogel (1995), Ruedi et al. (1990).














Crocidura negligens

Russell A. Mittermeier & Don E. Wilson 2018

Crocidura negligens

H. C. Robinson & Kloss 1914
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