sea nettle

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sea nettle,

any one of several species of stinging jellyfish, common along coasts and much feared by swimmers. Most stings are painful but are not dangerous to man; however, certain jellyfish of the order Cubomedusae and especially an Australian species, Chironex fleckeri, have caused many deaths. The sting, produced by nematocysts located in the tentacles, is used to kill or stun prey. Sea nettles are classified in the phylum CnidariaCnidaria
or Coelenterata
, phylum of invertebrate animals comprising the sea anemones, corals, jellyfish, and hydroids. Cnidarians are radially symmetrical (see symmetry, biological).
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, class Scyphoza.
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Changes in the lower Chesapeake Bay food chain in the presence of the sea nettle Chrysaora quinquecirrha (Scyphomedusa).
Semaeostomeae traditionally is composed of three families of pelagic jellyfish, including some of the best-known species: Cyaneidae (e.g., the lion's mane, Cyanea capillata), Pelagiidae (e.g., the sea nettle, Chrysaora quinquecirrha), and Ulmaridae (e.g., the moon jellyfish, Aurelia aurita).
This pattern is similar to, but less pronounced than, that for another semaeostome medusa, Chrysaora quinquecirrha, which possesses many fewer, more widely spaced tentacles (Ford et al., 1997).
Specimens of Chrysaora quinquecirrha (Desor, 1848) (Class Scyphozoa), Physalia physalis (Linnaeus, 1758), Porpita porpita (Linnaeus, 1758) Cladonema (sp.) (Class Hydrozoa), Chiropsalmus (sp).
Comparison by one of us (JWB) of nematocyst measurements of recent and long-preserved specimens of Chrysaora quinquecirrha and also the hydrozoan Physalia indicate great variation in measured size due to fixation; sizes given here for C.