Hydrozoa


Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
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]

Hydrozoa

the class of aquatic jellyfishes to which the Portuguese-man-of-war belongs.
References in periodicals archive ?
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).
Taxonomic redescription of the Portuguese man-of-war, Physalia physalis (Cnidaria, Hydrozoa, Siphonophorae, Cystonectae) from Brazil.
Neural condensation into the nerve rings may be associated with a more diverse behavioral repertoire in the Hydrozoa and Cubozoa, allowing more rapid and accurate behavioral adjustments.
Hydrozoa present higher average abundance and contributions to similarity in the selected group of samples with spat in both management sectors.
In the southwestern Atlantic Ocean, the Hydrozoa fauna have been widely studied in recent decades and its species richness is well known (see Migotto et al.
Lista de corales hermatipicos (Anthozoa, Scleractinia, Hydrozoa, Milleporina) a ambos lados del Istmos de Panama.
Belonging to the macro and mega-zooplankton, medusoid forms such as Hydrozoa, Scyphozoa and Cubozoa are only eventually registered in common zooplankton samples due to the size of individuals and their low density.
marchantioides (A) (B) Zosteraceae (A) (A) (B) (A) (B) (A) (B) Bacillariophyceae Terrestrial plant (A) (A) (B) Hydrozoa (A) (B) (A) Bryozoa (A) (B) (B) (A) (B) Gastropoda (B) (A) (B) Eumalacostraca (A) (B) (A) (B) (A) (B) Crustacea (A) (B) (A) (B) (A) (B) (A) (B) Feather of terrestrial insect Feather of bird (A) (A) Plastic (A) Others * (A) (B) (A) (B) (A) (B) (A) (B) 1998 Species Oct.
6 TAS mats around Site Site name code >50-75% (%) -100% (%) 13 m Las Redes LR13 60 [+ o -] 17 " 9 [+ o -] 16 76 [+ o -] 21 " 18 [+ o -] 17 66 [+ o -] 22 Morgan's Reef MR13 15 [+ o -] 12 39 [+ o -] 22 Media Luna ML13 31 [+ o -] 27 43 [+ o -] 34 " 18 [+ o -] 20 54 [+ o -] 26 Yal Ku YK13 21 [+ o -] 22 53 [+ o -] 32 Xaak XA13 32 [+ o -] 22 27 [+ o -] 16 19 m Las Redes LR19 20 [+ o -] 16 31 [+ o -] 22 Morgan's Reef MR19 25 [+ o -] 29 37 [+ o -] 24 Media Luna ML19 Yal Ku YK19 13 [+ o -] 13 28 [+ o -] 19 TABLE 2 Species-specific relative stony coral cover by depths (% [+ o -] standard deviations) in 2000, near Akumal, Mexico Species Percent relative coral cover (%) 13m 19m Hydrozoa, Milleporidae Millepora alcicornis 0.
Basic taxonomy of the Bougainvilliidae and its place within the Hydrozoa follow Marques & Collins (2004), Bouillon et al.
In regard to sperm chemotaxis, species- or genera-specificity was observed in hydrozoa (Miller, 1979) and echinoderms other than sea urchins (Miller.