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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
  • 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
  • ADW: Hydrozoa: INFORMATION
    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
  • Hydrozoa - The World Hydrozoa Database - World Register of . . .
    The Class Hydrozoa is morphologically the most diverse group of cnidarians Although marine species vastly outnumber freshwater ones, the freshwater genus Hydra may nevertheless represent the best-known hydrozoan
  • Hydrozoans (Class Hydrozoa) - iNaturalist
    Hydrozoa (hydrozoans, from ancient Greek ὕδρα, hydra, "sea serpent" and ζῷον, zoon, "animal") are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most living in salt water
  • Introduction to the Hydrozoa - University of California . . .
    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
  • Hydrozoa - Encyclopedia. com
    Hydrozoa (phylum Coelenterata, class Hydrozoa) are coelenterates that are closely related to the hydra,sea anemones, corals, and jellyfish Although a large majority of these species are common and widespread, they are often overlooked, as they are all small animals





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