A diverse cnidarian class whose life cycle, in most species, alternates between a colonial polyp stage and a free-swimming medusa stage, though many species have lost one stage or the other. Hydrozoa includes the freshwater Hydra used widely in developmental biology research, and the Portuguese man o' war, actually a colony of specialized individuals rather than a single organism.
Facts
Disputed
Member Species/Taxa CountApproximate described-species (or, for a genus, described-taxon) count; continually revised as species are newly described, reclassified or synonymized. Taxonomic Rank Scientific Name Classification
Living or Extinct Hydrozoa
Filter Results8 entries
Connections
Child Taxon Of
Parent Taxon Of
Source Wikidata: Aequorea victoria
Source Wikidata: Fire Coral
Source Wikidata: Freshwater Jellyfish
Source Wikidata: Immortal Jellyfish
Source Wikidata: Obelia Geniculata
Source Wikidata: Portuguese Man-of-War
Source Wikidata: Portuguese Man-of-War
In the Other Atlases
Found In
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "A few species occur in fresh and brackish water"Quote, Geographic Range: "A few species occur in fresh and brackish water"
A few species occur in fresh and brackish water on all continents except Antarctica.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "Hydrozoans are found in all the oceans, at all l"Quote, Geographic Range: "Hydrozoans are found in all the oceans, at all l"
Hydrozoans are found in all the oceans, at all latitudes.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "Hydrozoans are found in all the oceans, at all l"Quote, Geographic Range: "Hydrozoans are found in all the oceans, at all l"
Hydrozoans are found in all the oceans, at all latitudes.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "Hydrozoans are found in all the oceans, at all l"Quote, Geographic Range: "Hydrozoans are found in all the oceans, at all l"
Hydrozoans are found in all the oceans, at all latitudes.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "Hydrozoans are found in all the oceans, at all l"Quote, Geographic Range: "Hydrozoans are found in all the oceans, at all l"
Hydrozoans are found in all the oceans, at all latitudes.
Also in Geography Atlas: where this subject is found.
Source Animal Diversity Web: HydrozoaGeographic Range: "Hydrozoans are found in all the oceans, at all l"Quote, Geographic Range: "Hydrozoans are found in all the oceans, at all l"
Hydrozoans are found in all the oceans, at all latitudes.
Sources
1. Wikidata (taxon extant/extinct status)
Wikimedia Foundation / Wikidata contributorsQ181989, descriptionView the Source 2. Catalogue of Life
Wikidata: Hydrozoa
Wikidata Q181989, class allow-list match (w-wdresolver-0926)View the Source Wikidata: Portuguese Man-of-War
- Parent Taxon Of: Portuguese Man-of-War, Wikidata parent-taxon (P171) chain
- Parent Taxon Of: Portuguese Man o War, Wikidata parent-taxon (P171) chain
View the SourceWikidata: Immortal Jellyfish
Parent Taxon Of: Immortal Jellyfish, Wikidata parent-taxon (P171) chainView the Source Wikidata: Fire Coral
Parent Taxon Of: Fire Coral, Wikidata parent-taxon (P171) chainView the Source Wikidata: Freshwater Jellyfish
Parent Taxon Of: Freshwater Jellyfish, Wikidata parent-taxon (P171) chainView the Source Wikidata: Obelia Geniculata
Parent Taxon Of: Obelia Geniculata, Wikidata parent-taxon (P171) chainView the Source Wikidata: Aequorea victoria
Parent Taxon Of: Aequorea victoria, Wikidata parent-taxon (P171) chainView the Source Hydrozoa (Wikipedia)
In Group: Cnidarian Classes, LeadQuote, In Group: Cnidarian Classes, Lead
Hydrozoa (hydrozoans; from Ancient Greek ὕδωρ (húdōr) 'water' and ζώα (zóa) 'animals'), also called hydroids, are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water.
Hydra (genus) (Wikipedia)
Parent Taxon Of: Hydra, LeadQuote, Parent Taxon Of: Hydra, Lead
Hydra ( HY-drə) is a genus of small freshwater hydrozoans in the phylum Cnidaria.
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