723. EARLY CRETACEOUS BIVALVIA FROM THE CHOSHI DISTRICT, CHIBA PREFECTURE, JAPAN

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  • 723. 銚子地方産の前期白亜紀二枚貝類
  • 銚子地方産の前期白亜紀二枚貝類〔英文〕
  • チョウシ チホウサン ノ ゼンキ ハクアキ ニマイガイルイ エイブン

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Barremian and early Aptian bivalve fossils from the Choshi Group of central Honshu are examined mainly on the basis of newly collected material as a companion work to the paper on the coexistent gastropod fossils (KASE and MAEDA, 1980). Most specimens belong to already named species from the Lower Cretaceous marine strata of Kwanto mountains and the Outer Zone of Southwest Japan, but their diagnostic characters became clearer owing to the excellent state of preser vation. The following fifteen species are described in this article : Nuculopsis (Palaeonucula) ishidoensis, Portlandia sanchuensis, Mesosaccella (?) choshiensis sp. nov., Mesosaccella (?) sp., Solemya sp., Grammatodon (Nanonavis) yokoyamai, Pinna (Pinna) sp., Pterotrigonia (Pterotrigonia) pocilliformis, Astarte (Astarte) subsenecta, Laevicardium (?) sp. aff. L. (?) ishidoense, Rasatrix suzukii sp. nov., Caestocorbula shikamai sp. nov., Caestocorbula minima sp. nov., Corbulomima sp. cf. C. nuciformis and Plectomya aritagawana. Taxonomic comments are also given to several other bivalves which are not represented in the present collection but have been recorded from the Choshi Group in some previous works.

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