Five New Species of Bathyal Atlantic Ascothoracida (Crustacea: Maxillopoda) from the Equator to 50° N Latitude
Five new species of Ascothoracida are described from the Atlantic Ocean at depths of 700–3,500 m: Synagoga paucisetosa new species, host unknown, from 3,459 m in the equatorial Atlantic, based on a male; Synagoga bisetosa new species, host unknown, from about 2,000 m outside the Strait of Gibraltar, based on an immature ?female; Thalassomembracis atlanticus new species, host Chrysogorgia quadriplex Thomson, from about 1,450 m SW of the British Isles, based on a female; Zoanthoecus scrobisaccus new species, host Epizoanthus fatuus (M. Schultze), from 927 m near the Azores, based on females, a male, and nauplii; Dendrogaster deformator new species, host Novodinia antillensis (A. H. Clark), from 711 m in the Bahamas, based on females. New specimens of Cardomanica longispinata (Grygier), host Chrysogorgia elegans (Verrill), are recorded from the Lesser Antilles. Both new species of Synagoga have a pair of Waginella-like pits on the front inner surfaces of the carapace valves. Synagoga bisetosa has a unique thoracopod segmentation and is intermediate between other Synagoga species and Waginella in some features. Fouling organisms associated with some specimens of Cardomanica longispinata bring into question the nature of the relationship with the host. Naupliar antennule segmentation in Zoanthoecus scrobisaccus seems to be different from that of other ascothoracidans, with implications for maxillopodan systematics. Dendrogaster deformator is morphologically and ecologically intermediate between other species of Dendrogaster and the closely related genus Bifurgaster.
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Document Type: Research Article
Publication date: 1990-05-01
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