126 resultados para Crocidura russula


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The Zarudny's rock shrew, Crocidura zarudnyi Ognev, 1928, is found in very few localities in Afghanistan, Pakistan and Iran. Therefore, a record of the occurrence of additional populations of this species is very interesting. During surveys in Zabol (Iran), we caught three adult males of Crocidura sp. Based on external, dental and cranial measurements as well as genetic analyses, the individuals were identified as C. zarudnyi, which represents the first record of this species in this area.

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To the origins and evolution of Indomalayan shrews, we investigated the chromosomal variations of 14 species of Crocidura from SE Asia. Intraspecific polymorphism was mainly due to variation in the number of short chromosomal arms but C. lepidura and C. hutanis showed a polymorphism due to a centric fusion. The undifferentially stained karyotypes were similar in 9 species, all possessing 2n = 38 and FN = 54-56 (68); C. fuliginosa had 2n = 40 and FN = 54-58. These karyotypes are close to the presumed ancestral state for the genus Crocidura. Four species from Sulawesi had a reduced diploid number (2n = 30-34), a trend not observed among other SE Asian species but present in few Palaearctic taxa. Compared to the apparent stasis of karyotypic evolution observed among other SE Asian species, the high degree of interspecific differences reported among Sulawesian shrews is unusual and needs further investigation. Stasis and reduction in diploid number found in both Indomalayan and Palaeractic species suggest that these two groups share a common ancestry. This is in sharp contrast to most Afrotropical species which evolved towards higher diploid and fundamental numbers. The zoogeographical implications of these results are discussed.

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An original karyotype (2n=34) of 3 shrews from two localities on Crete is described. It confirms the specific status of Crocidura zimmermanni Wettstein, 1953.

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The karyotype, morphology and biology of Crocidura from Fuerteventura (Canary Islands) are described. The species has a diploid chromosome number of 2n = 36, thus differing from all other species of the genus. A detailed morphological comparison of the shrews from Fuerteventura, Lanzarote and other islets with C. russula from Morocco revealed specific characters for both taxa. Differences were also observed in biological parameters. It is concluded that the Canary Island populations of Crocidura form a biological species which is consequently named Crocidura canariensis sp. nov.

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von F. Kaufmann