Species
Hydractiniidae
IUCN
NCBI
EOL Text
recent & fossil
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Source | http://www.marinespecies.org/aphia.php?p=taxdetails&id=1601 |
Hydroids sessile, hydranths often polymorphic, usually epizootic; hydrorhiza either perisarc-covered stolonal tubes, or as an encrusting mat resulting from the coalescence of the stolonal system, either covered by a common layer of perisarc or with naked coenosarc; in some genera the hydrorhizal mat is reinforced by a calcareous skeleton; frequently with chitinous or calcareous spines forming sometimes pillars and branches, sometimes with protective tubes overarching the hydranths; gastrozooids either with one or several whorls of filiform tentacles beneath hypostome, or with scattered tentacles on the upper half of the body, exceptionally with one or two tentacles only; dactylozooids, when present, with no tentacles. Gonophores typically borne on gonozooids, these with one or more whorls of filiform tentacles or without tentacles and mouth (= blastostyles), giving rise to fixed sporosacs, eumedusoids, or free medusae. Medusa umbrella more or less bell-shaped, with or without slight apical process; manubrium tubular to sac-shaped, not extending beyond bell margin; with or without gastric peduncle; mouth with four simple or branched oral lips drawn out to form arms with terminal nematocyst clusters; four, eight, or more, solid, marginal tentacles, tentacles not in groups; four radial canals and circular canal; gonads on manubrium, interradial, sometimes extending along basal, perradial protrusions of the manubrium; with or without ocelli.
License | http://creativecommons.org/licenses/by/4.0/ |
Rights holder/Author | This work is licensed under a Creative Commons Attribution-Share Alike 4.0 License |
Source | http://www.marinespecies.org/aphia.php?p=taxdetails&id=1601 |
Hydractiniidae is a cnidarian family of athecate hydroids.
Genera[edit]
References[edit]
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Source | http://en.wikipedia.org/w/index.php?title=Hydractiniidae&oldid=595547081 |