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Free Content Ascothoracida (Crustacea: Maxillopoda) Parasitic on Chrysogorgia (Gorgonacea) in the Pacific and Western Atlantic

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Seven new species in two genera (one new) of bathyal, gorgonian-infesting ascothoracid crustaceans are described: Isidascus longispinatus new species on Chrysogorgia cf. elegans north of the Bahamas; Thalassomembracis conquistador new genus and species on Chrysogorgia sp. in the Moluccas; T. tetraedos new genus and species on C. papillosa in the Macassar Strait; T. bilobus new genus and species on C. cf. papillosa from Hawaii; T. orientalis new genus and species on Chrysogorgia sp. from the Philippines; T. acanthosphaericus new genus and species on same host specimen as I. longispinatus; T. bayeri new genus and species on C. desbonni in the Yucatan Channel. All species are represented by at least one mature female; a putative male is described of T. conquistador, and also nauplii of I. longispinatus, T. conquistador, and T. acanthosphaericus. Isidascus and Thalassomembracis are closely related to Gorgonolaureus Utinomi, and like that genus are classified in the Synagogidae. Most of the new species are attached to their host's axis by single or paired, anterior protrusions of the sometimes bizarrely shaped carapace, and, except for a posteroventral opening, are covered over with host coenenchyme. Thalassomembracis species have small, grapnel-like projections over parts of their carapaces; the four Pacific species may form a monophyletic unit within the genus. I. longispinatus and T. bilobus are often infested with cryptoniscid isopods, and T. tetraedos shares its host with an endoparasitic pycnogonid.

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Document Type: Research Article

Publication date: 1984-01-01

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