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hydrozoa    
n. 水螅虫类

水螅虫类

Hydrozoa
n 1: coelenterates typically having alternation of generations;
hydroid phase is usually colonial giving rise to the
medusoid phase by budding: hydras and jellyfishes [synonym:
{Hydrozoa}, {class Hydrozoa}]

Hydrozoa \Hy`dro*zo"a\, n. pl. [NL., fr. E. hydra Gr. zo^,on
an animal.] (Zool.)
The Acaleph[ae]; one of the classes of c[oe]lenterates,
including the Hydroidea, Discophora, and Siphonophora.
[1913 Webster]


Hydrozoon \Hy`dro*zo"["o]n\, n.; pl. L. {Hydrozoa}, E.
{Hydrozo["o]ns}. [NL.] (Zool.)
One of the Hydrozoa.
[1913 Webster]


{Molluscoidea}, including Brachiopoda and Bryozoa. {Mollusca},
including Cephalopoda, Gastropoda, Pteropoda, Scaphopoda,
Lamellibranchiata or Acephala. {Echinodermata}, including
Holothurioidea, Echinoidea, Asterioidea, Ophiuroidea, and
Crinoidea. {C[oe]lenterata}, including {Anthozoa} or {Polyps},
{Ctenophora}, and {Hydrozoa} or Acalephs. {Spongiozoa} or
{Porifera}, including the sponges.
{Protozoa}, including {Infusoria} and {Rhizopoda}. For
definitions, see these names in the Vocabulary.
[1913 Webster] Animalcular


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  • Hydrozoa - Wikipedia
    Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr; "water") and ζώα (zóa; "animals")) is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water
  • Hydrozoa | INFORMATION | Animal Diversity Web - ADW
    The Hydrozoa is a subgroup of cnidarians containging approximately 3700 species It is a diverse group with a variety of life cycles, growth forms, and specialized structures Like many cnidarians, hydrozoans have both polyp and medusa stages in their life cycle
  • Hydroid | Characteristics Life Cycle | Britannica
    Hydroid, any member of the invertebrate class Hydrozoa (phylum Cnidaria) Most hydroids inhabit marine environments, but some hydroids have invaded freshwater habitats Hydroids may be either solitary or colonial, and there are about 3,700 known species
  • Hydrozoa - The World Hydrozoa Database - World Register of Marine Species
    The World Hydrozoa Database includes all extant hydrozoan species and is intended to act as a tool for anyone looking for taxonomic information, both specialists and non-specialists alike
  • Hydrozoa - an overview | ScienceDirect Topics
    Hydrozoa refers to a class of predominantly marine and some freshwater organisms that are capable of metabolizing polyunsaturated fatty acids (PUFAs) via lipoxygenase (LO) pathways, leading to the production of bioactive hydroxyacids involved in processes such as tentacle regeneration and metamorphosis
  • Introduction to the Hydrozoa - University of California Museum of . . .
    Perhaps the best-known hydrozoan, familiar to most students of introductory biology, is Hydra, pictured at left Hydra never goes through a medusoid stage and spends its entire life as a polyp However, Hydra is not typical of the Hydrozoa as a whole
  • What are the characteristics of Hydrozoa? - The Institute for . . .
    What are the Characteristics of Hydrozoa? Hydrozoa are a diverse class of predominantly marine, colonial cnidarians characterized by their diploblastic tissue organization, often exhibiting both polyp and medusa stages in their life cycle and possessing specialized stinging cells called nematocysts
  • Hydrozoa - Animalia
    Hydrozoa(hydrozoans; from Ancient Greek ὕδωρ(húdōr)'water', and ζῷον(zôion)'animal') is a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water
  • 28. 2D: Class Cubozoa and Class Hydrozoa - Biology LibreTexts
    Hydrozoa includes nearly 3,200 species; most are marine, although some freshwater species are known Animals in this class are polymorphs: most exhibit both polypoid and medusoid forms in their lifecycle, although this is variable
  • Hydroids (Cnidaria, Hydrozoa): A Neglected Component of Animal Forests
    Hydroids, one of the dominant components of the zoobenthic communities, share comparable growth patterns with higher plants because of their modular body organization, high potential of asexual reproduction, and phenotypic plasticity





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