BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA Vol 61, Núm. 2, 2006, P.. 199-202 http://dx.doi.org/10.18268/BSGM2009v61n2a6

Ponotus shirahamensis, a new genus and species of raninid crab (Decapoda, Brachyura) from the Miocene Tanabe Group of Japan

Ponotus shirahamensis, un nuevo género y especie de cangrejo ranínido (Decapoda, Brachyura) del Grupo Tanabe del Mioceno en Japón

Hiroaki Karasawa¹*, Masaaki Ohara²

¹ Mizunami Fossil Museum, Yamanouchi, Akeyo, Mizunami, Gifu 509–6132, Japan.
² Wakayama Prefectural Museum of Natural History, Funao, Kainan, Wakayama 642–0001, Japan.

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Abstract

Ponotus shirahamensis, a new genus and species of the crab family Raninidae (Decapoda: Brachyura) is described from the lowermost middle Miocene Tanabe Group in Wakayama Prefecture of central Japan. Ponotus shirahamensis represents the second record for the family Raninidae from the Miocene deposits of Japan. Ponotus is most similar to Notopus, an extant monotypic genus of the Notopodinae, but is characterized by the absence of a spinose transverse ridge between the hepatic spines on the dorsal carapace.

Keywords: Crustacea, Decapoda, Japan, Miocene, Raninidae.