Hydra (/ ˈhaɪdrə / HY-drə) is a genus of small freshwater hydrozoans of the phylum Cnidaria.

Hydra oligactis: information (1) To cite this page: Myers, P., R. Espinosa, C. S. Parr, T. Jones, G. S. Hammond, and T. A. Dewey. 2025. The Animal Diversity Web (online). Accessed at …

Authorship, types, synonyms, homonyms, common names, taxonomic positions and number of subtaxa of Genus Hydra Linnaeus, 1758

Oct 1, 2010 · The taxonomy of hydra is centered on Eurasian and North American specimens (Chen and Wang, 2008, Forrest, 1963, Holstein, 1995). Hydra are reported from all continents …

THE NCBI Taxonomy database allows browsing of the taxonomy tree, which contains a classification of organisms.

Hydra are a genus of small, fresh-water organisms that are classified under the phylum Cnidaria. In addition to being related to such organisms as jellyfish, they are characterized by their tiny, …

For the latest taxonomy data, visit boldsystems.org. Collected from 14 countries.

Taxonomic hierarchy of Genus Hydra Linnaeus, 1758. Display of synonyms, alternative taxonomic positions, references, number of subtaxa, and phylogenetic/bibliographic position can be …

Feb 1, 2025 · Hydra, genus of invertebrate freshwater animals of the class Hydrozoa (phylum Cnidaria). The body of such an organism consists of a thin, usually translucent tube that …

Mar 1, 2025 · The four distinct groups: oligactis (stalked hydra), vulgaris (common hydra), viridissima (symbiotic green hydra), and braueri (gracile hydra); were identified primarily based …