Hydrozoa

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Related to hydrozoans: anthozoans, scyphozoans

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]

Hydrozoa

the class of aquatic jellyfishes to which the Portuguese-man-of-war belongs.
References in periodicals archive ?
Pattern in intertidal hydrozoan distribution along the coast of Sao Paulo State, Southeastern Brazil.
In various other hydrozoan species, however, physiological studies have shown that cnidocytes receive synaptic input from neurons and sensory cells in the tentacle (Thurm et al, 1998b, 2004; Price and Anderson, 2006; Oliver et al, 2008) and, moreover, function as primary sensory receptors for mechanical (Brinkmann et al.
Increase in intracellular cAMP is a prerequisite signal for initiation of physiological oocyte meiotic maturation in the hydrozoan Cytaeis uchidae.
An example of this type of seasonal variation is found in the species composition of the population of hydrozoan medusas on the eastern coasts of Papua New Guinea.
Around 100 species (polyps and medusae) are reported from the state of Parana, of which 89 are hydrozoans (including hydromedusae, solitary and colonial hydroids), nine are scyphozoans (typical jellyfish) and two are cubozoans (box jellyfish) (Marques et al.
Limpet stomachs contained 78 taxa, including filamentous cyanobacteria, diatoms, brown and red algae, marine seagrass, foraminifera, hydrozoans, bryozoans, nematodes, bivalves, gastropods, crustaceans, and tunicates.
Our investigation is the first statistical account of nematocyst sizes in hydrozoans, and the first full account of enidom in C.
The basal stratum contains many sponges, madrepores, bryozoans, sea squirts, polychaetes, and hydrozoans.
33 millisecond (ms), beating out other record movements such as the release of stingers by hydrozoans (jellyfish) at 0.
Sessile epibiont organisms such as hydrozoans, sponges and particularly epiphytic algae influence the abundance and diversity of phytal fauna (Kangas, 1978; Leite & Turra, 2003), because they increase the complexity of the macrophytes on which they develop (Bell et al, 1984; Hall & Bell, 1988).
Such experimental designs are routine in studies of hydrozoans, and random effects (e.