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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
  • 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
  • What Are Hydrozoans? Life Cycle, Colonies, and Species
    Hydrozoans are a diverse class of invertebrates within the phylum Cnidaria, inhabiting marine environments worldwide, with a few species adapted to freshwater This group shares its phylum with jellyfish, corals, and sea anemones Hydrozoans exhibit unique complexity in their life cycles and colonial structures
  • What Is a Hydrozoan? Forms, Life Cycle, and Examples
    Hydrozoans are a diverse group of aquatic animals, comprising approximately 3,700 known species within the phylum Cnidaria These invertebrates share ancestry with creatures like jellyfish, sea anemones, and corals While many are small, their forms, sizes, and habitats vary greatly
  • 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
  • Hydrozoa - an overview | ScienceDirect Topics
    Hydrozoa is defined as a class of approximately 3000 species that includes both marine and freshwater organisms, characterized by a life cycle that alternates between polyp and medusa stages, with various patterns of asexual reproduction occurring in both stages
  • 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
  • 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
  • Hydrozoa: Aquatic Invertebrates Explained | Earth Life
    Hydrozoa is a class of aquatic invertebrates that are closely related to corals, jellyfish, and sea anemones They belong to the phylum Cnidaria, which also includes other gelatinous zooplankton like jellyfish and box jellies





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