A new species of the genus ocadia (Testudines: Geoemydidae) from the middle miocene of tanegashima island, southwestern Japan and its paleogeographic implications

Akio Takahashi, Kimihiko Oki, Takahiro Ishido, Ren Hirayama

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

A new geoemydid turtle, Ocadia tanegashimensis (Testudines: Geoemydidae) is described on the basis of a relatively well-preserved shell from the lower middle Miocene of Tanegashima Island, Kagoshima Prefecture, southwestern Japan. This species is clearly distinguished from two congeneric species (extant O. sinensis and O. nipponica from the middle Pleistocene of eastern Japan) due to the presence of the following character states: length of the entoplastron as long as the interhyoplastral suture, the costals dovetailed with one another in outline, the third pleural overlapping only the sixth and seventh peripherals. The present study suggests that the initial intrageneric diversification of Ocadia began not later than the early Miocene in eastern Asia.

Original languageEnglish
Pages (from-to)527-540
Number of pages14
JournalZootaxa
Volume3647
Issue number4
DOIs
Publication statusPublished - 2013 May 13

Keywords

  • Kawachi formation
  • Kukinaga group
  • Miocene
  • Ocadia tanegashimensis sp. nov.
  • Paleogeography
  • Reptilia

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology

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