Family DAJIDAE Sars, 1882

Holophryxus acanthephyrae

© Copyright from Jones & Smaldon 1986.

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Introduction

Dajids are parasitic in the incubatory chamber or dorsal surface of euphausiaceans, mysidaceans and caridans (rarely in Brachyura). About 50 species are known. Jones & Smaldon (1986) and Wasmer (1988) reviewed the systematics and biology of one of the larger genera, Holophryxus. Taberley (1954a, 1954b) summarised information about juvenile stages. The diagnosis is adapted from Sars (1898), Richardson (1905) and Naylor (1972).{47973:a}{47974:b}

Diagnosis

Female: Symmetrical, somites visible only mid-dorsally if at all. Oral cone (mandible and lamellar maxilliped only) produced anteriorly or posteriorly. Pereopods of 4 or 5 pairs, crowded around mouth. Oostegites small, few, brood pouch bilateral. Pleopods small or absent. Uropod distinct or absent. Male: Narrow, with pereonite 1 fused to head.

General References

Jones, M.B. & Smaldon, G. 1986. On the genus Holophryxus (Isopoda: Epicaridea), with description of the male and redescription of the female of Holophryxus acanthephyrae. Journal of the Marine Biological Association of the United Kingdom 66: 303-314

Naylor, E. 1972. British Marine Isopods. Keys and Notes for the Identification of the Species. Synopses of British Fauna No. 3. London : Linnean Society of London 86 pp.

Richardson, H. 1905. A monograph on the isopods of North America. Bulletin of the United States National Museum 54: I-LIII, 1-727

Sars, G.O. 1882. Oversigt af Norges Crustaceers med forlobige Bemaerkninger over de nye eller mindre bekjendte Arter. Forhandlinger i Videnskabs-Selskabet i Christiania 1882(18): 1-124

Sars, G.O. 1898. Parts 11, 12. Oniscidae (concluded), Bopyridae, Dajidae. 185-232, pls 89-96 in Sars, G.O. (ed.). An Account of the Crustacea of Norway with short descriptions and figures of all the species. Isopoda. Bergen : Bergen Museum Vol. 2 270 pp.

Wasmer, R.A. 1988. The parasitic isopod Holophryxus acanthephyrae Stephensen (Epicaridea: Dajidae) from the subantarctic South Pacific, with notes on its synonymy and host. Proceedings of the Biological Society of Washington 101: 20-30

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