Karyological differentiation between two Soriculus (Insectivora : Soricidae) from Taiwan

Abstract

The conventional karyotypes of two Soriculus species endemic to Taiwan, S. fumidus Thomas, 1913 and 5. sodalis (Thomas, 1913) were investigated. The autosomes of S. fumidus consist of 18 meta-or submetacentric, seven subtelocentric and five acrocentric pairs. The X and Υ chromosomes are large submetacentric and minute acrocentric elements, respectively. The diploid chromosome number is 64 and the fundamental number is 116, respectively. The karyotype of S. sodalis consists of 20 meta or submetacentric and two subteloccntric pairs, and the diploid chromosome number and fundamental number are 44 and 88, respectively. The sex chromosomes for this species were not identified. These two Soriculus species in Taiwan are different in chromosome number and fundamental number. The previous report of S. caudatus fumidus (= S. fumidus) from Taiwan as having 2n = 40 and FN = 56 karyotype is actually based on erroneously identified specimens of Crocidura attenuata.Resume. -Le caryotype conventionnel de deux especes de Soriculus endemiques de Taiwan, S. fumidus Thomas, 1913 et S. sodalis (Thomas, 1913 a etc obtenu. Les autosomes dc S. fumidus consistent en 18 paires meta ou submetacentriques, 7 paires subtelocentriques et 5 paires acrocentriques. Lc chromosome X est un grand submetacentriquc et le Υ un petit acrocentriquc. Le nombre diploi'de est de 64, et le nombre fondamental de 116. Le caryotype dc 5. sodalis consiste en 20 paires meta ou submetacentriques, et 2 paires subtelocentriques, soit un nombre diploi'de de 44 un nombre fondamental de 88. Les chromosomes sexuels de cettc espece n'ont pas identifies. Les 2 especes de Soriculus de Taiwan sont done claircment diffcrcntes quant leur nombre de chromosomes et leur nombre fondamental. Une precedente mention d'un caryotype de S. caudatus fumidus (= S. fumidus) de Taiwan a 2n = 40 et FN = 56 est en fait basee sur des specimens de Crocidura attenuata mal identifies.

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

“…Because the larger E. caudatus is separated from these three subspecies as a distinct species in this study, the three recognized subspecies become subspecies of E. sacratus following the nomenclatural priority rule, and the Nepalese subspecies should be E. sacratus soluensis. Therefore, This study This study This study Motokawa et al 1998Motokawa et al 1998Obara and Tada 1985Obara et al 1996;Motokawa et al 2006Motokawa et al 2006Fredga and Levan 1969Rimsa et al 1978;Ivanitskaya and Malygin 1985;Graphodatsky et al 1993;Zima et al 1998Meylan 1966Jiménez et al 1984;Zima et al 1998Sokolov and Tembotov 1989Graphodatsky et al 1993Motokawa et al 2004Harada and Takada 1985Motokawa et al 2004 we propose a revised species systematics of Episoriculus caudatus sensu Motokawa and Lin (2005) has not yet been determined; a more comprehensive systematic study of the genus Episoriculus should be conducted.…”

“…Their karyotypes differed and had larger 2n and FN values than other species in the tribe Nectogalini (Table 1; Meylan 1966;Fredga & Levan 1969;Rimsa et al 1978;Jiménez et al 1984;Harada & Takada 1985;Ivanitskaya & Malygin 1985;Obara & Tada 1985;Sokolov & Tembotov 1989;Graphodatsky et al 1993;Obara et al 1996;Zima et al 1998;Motokawa et al 1998Motokawa et al , 2004Motokawa et al , 2006. Episoriculus fumidus from Taiwan also has larger 2n and FN values (2n = 64, FN = 116; Motokawa et al 1998), but Chodsigoa sodalis from Taiwan has lower 2n and FN values (2n = 44, FN = 88; Motokawa et al 1998). These tendencies in 2n and FN might result from the evolutionary relationships among species.…”

“…These tendencies in 2n and FN might result from the evolutionary relationships among species. Soriculus, Episoriculus and Chodsigoa have been treated as the single genus Soriculus in many studies (Hoffmann 1986;Corbet & Hill 1992;Hutterer 1993;Motokawa et al 1997Motokawa et al , 1998Motokawa, 2003;Motokawa & Lin 2005), but monophyly of these three genera is not supported by molecular phylogeny (Ohdachi et al 1997(Ohdachi et al , 2006. Ohdachi et al (2006) …”

“…Many previous authors have included Soriculus, Episoriculus and Chodsigoa within the single genus Soriculus as subgenera or junior synonyms (Hoffmann 1986;Corbet & Hill 1992;Hutterer 1993;Motokawa et al 1997Motokawa et al , 1998Motokawa 2003;Motokawa & Lin 2005; but see also Lunde et al 2003); however, Hutterer (2005) recently reinstated each of these as a distinct genus and this is now the accepted classification. These three genera are classified into the tribe Nectogalini, subfamily Soricinae, family Soricidae and order Soricomorpha (Hutterer 2005), and are distributed in the Himalayan region, southern China, northern Vietnam and Taiwan.…”

“…These three genera include a single species in Soriculus, five species in Episoriculus and eight species in Chodsigoa (Hutterer 2005;Motokawa & Lin 2005). Karyotypes have been investigated for only two species, Episoriculus fumidus and Chodsigoa sodalis, both from Taiwan (Motokawa et al 1998).…”