Cnidaria


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Cnidaria

 [ni-dar´e-ah]
a phylum of marine invertebrates that includes sea anemones, hydras, jellyfish, and corals. See also coelenterata.

Cnidaria

a subphylum of the phylum Coelenterata in some classifications, where the Ctenophora (sea gooseberries) form the other subphylum (see COELENTERATE). However, in more modern classifications the Ctenophora are given the status of a phylum, so that the organisms classified in the Cnidaria (hydroids, jellyfishes, sea anemones and corals) are the only organisms in the new phylum Coelenterata, thus making the term Cnidaria obsolete.
References in periodicals archive ?
Phylogeny and biogeography of Hydra (Cnidaria: Hydridae) using mitochondrial and nuclear DNA sequences.
Jellyfish (Chrysaora lactea, Cnidaria, Semaeostomeae) aggregations in southern Brazil and consequences of stings in humans.
Zagal CJ (2008) Morphological abnormalities in the stauromedusa Haliclystus auricula (Cnidaria) and their possible causes.
Year and Month July October January Species Phyla 2004 2004 2005 Cliona celata Porifera - - - Unidentified hydroid Cnidaria - + + Diadumene lineata Cnidaria - + + Unidentified bryozoan Bryozoa - + + Membranipora tenuis Bryozoa - + + Boonea impressa Mollusca - + + Brachidontes exustus Mollusca + + + Crassostrea virginica Mollusca + + + Crepidula maculosa Mollusca - + + Geukensia demissa Mollusca - + + Littorina meleagris Mollusca + + + Nassarius obsoletus Mollusca + + + Sphenia antillensis Mollusca - - + Hydroides sp.
This specimen from the Arctic is probably a new species of comb jelly, (Unlike true jellyfish, in the phylum Cnidaria, comb jellies don't have stinging cells.) Census participants have lamented the current shortage of experts able to classify the vast numbers of organisms that have been pulled from the seas in the past decade.
Frequency Number (stomachs) %F (counts) Phylum Cnidaria Class Hydrozoa Family Sertulariidae Sertularia sp.
Lagoons USX Reach Taxa NPS1 NPS2 FWS1 Phylum Porifera Phylum Cnidaria Hydridae Hydra Phylum Platyhelminthes Turbellaria Phylum Nematoda Phylum Bryozoa Plumatella unidentified bryozoans Phylum Annelida Oligochaeta Lumbricidae Lumbriculidae Tubificidae Limnodrilus Limnodrilus cervix Limnodrilus hoffmeisteri Potamothrix vejdovskyi Quistadrilus multisetosus immature w/o capil.
which have the most elaborate nervous systems within Cnidaria. Cubozoans have rhopalia similar to those of the scyphozoans, but those of cubozoans are more complex, in that each of their four rhopalia contains a brain-like structure (Garm et al, 2006).