903. TAXONOMIC AND PALEOZOOGEOGRAPHIC SIGNIFICANCE OF CENOZOIC HUNCH-BACK LIKE VENERIDS : PART 1. GIGANTOCALLISTA, GEN. NOV. (MOLLUSCA : BIVALVIA), A NEW ENDEMIC VENERID GENUS FROM THE PLIOCENE TATSUNOKUCHI FORMATION, SENDAI CITY, MIYAGI PREFECTURE, NORTHEASTERN JAPAN

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  • 903. Gigantocallista, 宮城県仙台市の鮮新世竜ノ口層 Veneridae 科 (二枚貝綱) の一新属
  • Gigantocallista,宮城県仙台市の鮮新世竜ノ口層Veneridae科(2枚貝綱)の1新属〔英文〕
  • Gigantocallista ミヤギケン センダイシ ノ センシンセイ タツ

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A new genus of hunch-back like Bivalvia, Gigantocallista, is proposed and Pitar sendaica Nomura is designated as the type-species. The genus is monotypic and may have evolved from the Miocene genus Neogenella. Gigantocallista sendaica occurs only in the Pliocene Tatsunokuchi Formation, and may reflect localized zoogeographic or paleoecological conditions within the Pliocene Paleo-Sendai Bay.

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