Elaphognathia discolor - Biological Information System for Marine Life

Infauna of terebellid polychaete tubes. Males are refered to be harem-formers and an adult male forms a breeding aggregation consist of a male and several females in a polychaete tube (Tanaka & Nishi, 2008) . There are two male phenotype, large and small, in the gnathiid, and small males are suggested to be sneakers intruding harems of large males (Tanaka & Nishi, 2011).

Size

Body length: 3-6 mm in males (excluding mandibles).

Depth

1-5 m.

Distribution, biogeography

Sea off Ibaraki Prefecture; Shizugawa Bay, Miyagi, Japan (38 deg 38.519 min N, 141 deg 29.020 min E).

Elaphognathia discolor (Nunomura, 1988) of literature

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Cohen, B. F. and G. C. B. Poore (1994) Phylogeny and biogeography of the Gnathiidae (Crustacea: Isopoda) with descriptions of new genera and species, most from south-eastern Australia. Memoirs of the Museum of Victoria 54: 271-397.

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Nunomura, N. (1988) A new species of Gnathia (Crustacea, Isopoda) from the sea off Ibaragi, central Japan. Bulletin of the Toyama Science Museum 12: 27-28.

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Nunomura, N. (1995) Isopoda. In: Nishimura, S. (ed.), Guide to Seashore Animals of Japan with Color Pictures and Keys, vol. II. Hoikusha, Osaka, 205-233 (in Japanese).

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Tanaka, K. and E. Nishi (2008) Habitat use by the gnathiid isopod Elaphognathia discolor living in terebellid polychaete tubes. Journal of the Marine Biological Association of the United Kingdom 88: 57-63.

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Tanaka, K. and E. Nishi (2011) Male dimorphism in the harem-forming gnathiid isopod Elaphognathia discolor (Crustacea: Isopoda). Zoological Science, 28, 587-592.

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