Karyotypes of three shrew species (Soriculus nigrescens, Episoriculus caudatus and Episoriculus sacratus) from Nepal.

The karyotypes of three shrew species (Mammalia, Soricomorpha, Soricidae) from Nepal were examined for the first time. Based on the karyotypes and overall differences in skull size, the current Episoriculus caudatus appeared to include two distinct species: the larger E. caudatus and the smaller Episoriculus sacratus. Episoriculus sacratus has three subspecies, E. s. soluensis in Nepal and Sikkim, E. s. umbrinus in Assam, Myanmar and the Yunnan Province of China, and E. s. sacratus in the Sichuan Province of China. Soriculus nigrescens had a diploid chromosome number (2n) and fundamental number (FN), including two X chromosomes, of 64 and 92, respectively, consisting of 11 metacentric or submetacentric, two subtelocentric and 18 acrocentric pairs of autosomes, a metacentric X and an acrocentric Y chromosome. Episoriculus sacratus soluensis had 2n = 74 and FN = 126, consisting of 12 metacentric or submetacentric, 13 subtelocentric and 11 acrocentric pairs of autosomes, a submetacentric X and an acrocentric Y chromosome. Episoriculus caudatus had 2n = 60 and FN = 118, consisting of 19 metacentric or submetacentric, nine subtelocentric and one acrocentric pair of autosomes, a subtelocentric X and an acrocentric Y chromosome. The karyotypes of these three species are characterized by their large 2n and FN values compared with other Soricidae.

[1]  A. Levan,et al.  NOMENCLATURE FOR CENTROMERIC POSITION ON CHROMOSOMES , 2009 .

[2]  A. Levan,et al.  The chromosomes of the European water shrew (Neomys fodiens). , 2009, Hereditas.

[3]  M. Hasegawa,et al.  Molecular phylogenetics of soricid shrews (Mammalia) based on mitochondrial cytochrome b gene sequences: with special reference to the Soricinae , 2006 .

[4]  Liang-kong Lin,et al.  Taxonomic study of the water shrewsChimarrogale himalayica andC. platycephala , 2006, Acta Theriologica.

[5]  Liang-kong Lin,et al.  Taxonomic status of Soriculus baileyi (Insectivora, Soricidae) , 2005 .

[6]  Liang-kong Lin,et al.  Geographic differences in karyotypes of the mole-shrew Anourosorex squamipes (Insectivora, Soricidae) , 2004 .

[7]  N. T. Son,et al.  A survey of small mammals from Mt. Tay Con Linh II, Vietnam, with the description of a new species of Chodsigoa (Insectivora: Soricidae) , 2003 .

[8]  J. Adachi,et al.  Phylogeny of Eurasian Soricine Shrews (Insectivora, Mammalia) Inferred from the Mitochondrial Cytochrome b Gene Sequences , 1997 .

[9]  J. Koseki,et al.  Heteromorphism of the No.1 homologue in the Japanese water shrew, Chimarrogale himalayica platycephala , 1996 .

[10]  J. Hill,et al.  The Mammals of the Indomalayan Region: A Systematic Review , 1992 .

[11]  M. Harada,et al.  Karyotypes of two species of insectivora from Taiwan (Insectivora, Soricidae) , 1985, Experientia.

[12]  R. Díaz de la Guardia,et al.  Meiotic behaviour of sex chromosomes and polymeiosis in three species of insectivores , 1984, Genetica.

[13]  M. Harada,et al.  Karyological study of four Japanese Myotis bats (Chiroptera, Mammalia) , 1978, Chromosoma.

[14]  H. Abe.  Variation and Taxonomy of Some Small Mammals from Central Nepal , 1977 .

[15]  H. Abe.  Small Mammals of Central Nepal , 1971 .

[16]  F.R.S. J. E. Gray Esq..  XXXVII.—Descriptions of some new Genera and fifty unrecorded Species of Mammalia , 1842 .

[17]  M. Motokawa,et al.  Soriculus minor Dobson, 1890, senior synonym of S. radulus Thomas, 1922 (Insectivora, Soricidae) , 2003 .

[18]  M. Harada,et al.  Karyological differentiation between two Soriculus (Insectivora : Soricidae) from Taiwan , 1998 .

[19]  M. Wolsan,et al.  Evolution of shrews , 1998 .

[20]  T. Tada,et al.  Karyotypes and Chromosome Banding Patterns of the Japanese Water Shrew, Chimarrogale platycephala platycephala , 1985 .

[21]  A. Meylan.  Données nouvelles sur les chromosomes des Insectivores européens (Mamm.) , 1966 .

[22]  G. M. Allen.  New Chinese insectivores , 1923 .