Hydrozoa


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Related to Hydrozoa: Scyphozoa, Anthozoa, class Hydrozoa, Staurozoa

Hy·dro·zo·a

(hī-drō-zō'ă),
A class of coelenterates or jellyfish, including Hydra, a freshwater polyp, Physalia, the "Portuguese man-of-war," Millepora, a stinging coral, and the sea wasps, Chironex heckeri and Chiropsalmus quadrigatus, the stings of which can cause severe wheals, pain, skin necrosis, and occasionally, rapid death from respiratory and cardiac depression.
[hydro- + G. zōon, animal]
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References in periodicals archive ?
A search for predators and food selectivity of two native species of Hydra (Cnidaria: Hydrozoa) from Brazil.
Arthropoda had the highest number of taxa (161 taxa; mostly Crustacea), followed by Annelida (122; mostly Polychaeta), Mollusca (114; mostly Bivalvia and Gastropoda), Bryozoa (50), Echinodermata (43), Cnidaria, both Anthozoa and Hydrozoa (27), and other phyla with one to three taxa (Brachiopoda, Cephalorhyncha, Entoprocta, Nemertea, Platyhelminthes, Porifera, Sipuncula).
Brinkmann-Voss A (1970) Anthomedusae/Athecatae (Hydrozoa: Cnidaria) of the Mediterranean.
The class Hydrozoa has been rated quite tolerant of certain natural phenomena, such as high alkalinity, sulfate concentrations, sedimentation, and low stream gradients (USDA Forest Service 1989) (Table 2).
Species commonly recorded included Polychaeta (Spirorbis sp., Galeolaria hystrix, Pomatoceratos carniferus), Bryozoa (Beania sp., Bitectipora sp., Schizomittina, Platonea sp., Tubulipora sp., Smittoidea maunganuiensis, Cellaria sp.), Hydrozoa (Family Sertularidae), and Ascidiacea (Didemnum sp.).
Transmission genetics of allorecognition in Hydractinia symbiolongicarpus (Cnidaria: Hydrozoa).
First record of the invasive medusa Blackfordia virginica (Hydrozoa: Leptomedusae) in the Rio de la Plata estuary, Argentina-Uruguay.
Se identificaron 229 especies correspondientes a 11 Filos: Annelida (Polychaeta), Arthropoda (Pycnogonida, Malacostraca, Ostracoda), Bryozoa, Chordata (Ascidiacea), Cnidaria (Anthozoa, Hydrozoa), Echinodermata (Echinoidea, Ophiuroidea, Holothuroidea, Asteroidea), Mollusca (Gastropoda, Bivalvia, Polyplacophora, Cephalopoda, Scaphopoda), Nemertea (Anopla, Enopla), Platyhelminthes, Porifera y Sipuncula, todos son grupos representativos de comunidades bentonicas costeras (Tabla 1, Apendice I).