BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA Vol 60, Núm.. 1, 2008, p. 101-110 http://dx.doi.org/10.18268/BSGM2008v60n1a7

New records for Crustacea from the Arida Formation (Lower Cretaceous, Barremian) of Japan

Nuevos registros de Crustacea en la Formación Árida (Cretácico Inferior, Barremiano) de Japón

Hiroaki Karasawa^1,*, Masaaki Ohara², and Hisayoshi Kato³

¹ Mizunami Fossil Museum, Yamanouchi, Akeyo, Mizunami, Gifu 509–6132, Japan.
² Wakayama Prefectural Museum of Natural History, Funao, Kainan, Wakayama 642–0001, Japan.
³ Natural History Museum and Institute, Chiba, 955–2, Aoba–cho, Chiba 260–8682, Japan.

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Abstract

Four new species of decapods and one new species of isopod are described from the Barremian (Lower Cretaceous) Arida Formation in Wakayama Prefecture, Japan. Xanthosia sakoi new species (Brachyura, Etyidae) and Palaega yamadai new species (Isopoda, Cirolanidae) represents the first record of each genus from the North Pacific realm. Xanthosia sakoi is the oldest member of this genus. Eryma nippon new species (Astacidea, Erymidae) is the first Cretaceous record for the genus Eryma from the North Pacific realm. Hoploparia natsumiae new species (Astacidea, Nephropidae) comprises the second record of this genus from the Barremian of Japan. Eomunidopsis kinokunica new species (Anómala, Galatheidae) represents the oldest record from the North Pacific realm. The systematic position of the family Etyidae is discussed and the Etyidae is elevated to full superfamily status.

Key words: Cretaceous, Crustacea, Decapoda, Isopoda, Etyidae, Japan.