A Generic Revision of the Stylasteridae (Coelenterata: Hydrozoa).
Part 3. Keys to the Genera
Dichotomous and tabular keys to the 23 genera, 2 subgenera, and 5 species groups of the Stylasteridae are presented. The keys stress easily recognized external skeletal characters, most of which can be seen using a dissecting microscope, such as: coordination of dactylopores and gastropores, presence or absence of gastro- and dactylostyles, cyclosystem orientation, dactylopore spine shape, ampullar position, gastropore tube shape, dactylopore tube length, and coenosteal texture. Each of these characters is briefly discussed in the context of its discriminating power and its phylogenetic value. Two new terms are introduced to characterize dactylopore tubes: axial and peripheral. Numbers of valid species for each genus and their geographic and bathymetric ranges are listed. Two hundred twenty-four stylasterid species are considered to be valid, including 24 exclusively fossil species. Stylasterids are cosmopolitan, but insular, in distribution, ranging from 0–2,789 m.
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Document Type: Research Article
Publication date: September 1, 1991
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