Anatomical and molecular studies reveal several cryptic species of the endemic genus Mandarina (Pulmonata: Helicoidea) in the Ogasawara Islands

Satoshi Chiba, Angus Davison

研究成果: Article査読

17 被引用数 (Scopus)

抄録

The endemic genus Mandarina from the Ogasawara Islands in the north-western Pacific has undergone a significant adaptive radiation, and so is of interest in understanding speciation in land snails. While the majority of Mandarina species are easily recognized because underlying morphological differences in genital characters are mirrored by differences in the shell and ecology, we show here that the genus also includes several cryptic species. On the basis of anatomical characters described here, and supported by previously published phylogenies using mitochondrial rRNA sequences, we conclude that five distinct species were previously included in two nominal species: Mandarina hayatoi n. sp., and M. kaguya n. sp., both previously M. hahajimana, are a morphologically variable, allopatric/parapatric species complex on the Hahajima archipelago; M. tomiyamai n. sp. is conchologically similar to M. hirasei on Chichijima, but with distinct genital morphology. Populations of these cryptic species may have similar shells because of convergent evolution, a result of adaptation to similar arboreal lifestyle, so divergence of sexual organs must have occurred independently of habitat preference. These findings therefore support the assertion that sexual selection is an additional factor in the radiation of Mandarina.

本文言語English
ページ(範囲)373-382
ページ数10
ジャーナルJournal of Molluscan Studies
74
4
DOI
出版ステータスPublished - 2008 11月

ASJC Scopus subject areas

  • 水圏科学
  • 動物科学および動物学

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