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Free Content A Generic Revision of the Stylasteridae (Coelenterata: Hydrozoa).

Part 3. Keys to the Genera

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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.

Document Type: Research Article

Publication date: September 1, 1991

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  • The Bulletin of Marine Science is dedicated to the dissemination of high quality research from the world's oceans. All aspects of marine science are treated by the Bulletin of Marine Science, including papers in marine biology, biological oceanography, fisheries, marine affairs, applied marine physics, marine geology and geophysics, marine and atmospheric chemistry, and meteorology and physical oceanography.
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