Page last updated Wed 05 Feb 2020


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Use the links to navigate the hierarchy of invertebrate classification.

  Family Hydridae

Genus Hydra (+ Chlorohydra, + Pelmatohydra)

    Species H. vulgaris -- Wisconsin!
    Species H. canadensis -- midwestern North America.
    Species H. oligactis -- midwestern North America.
    Species H. viridissima -- midwestern North America.
    Species H. cauliculata -- North America.
    Species H. circumcincta -- North America.
    Species H. hymanae -- North America.
    Species H. oregona -- North America.
    Species H. utahensis -- North America.
    Species H. baikalensis
    Species H. beijingensis
    Species H. daqingensis
    Species H. ethiopiae
    Species H. hadleyi
    Species H. harbinensis
    Species H. iheringi
    Species H. intaba
    Species H. intermedia
    Species H. japonica
    Species H. javanica
    Species H. liriosoma
    Species H. madagascariensis
    Species H. magellanica
    Species H. mariana
    Species H. minima
    Species H. mohensis
    Species H. oxycnida
    Species H. paludicola
    Species H. paranensis
    Species H. parva
    Species H. plagiodesmica
    Species H. polymorpha
    Species H. robusta
    Species H. rutgersensis
    Species H. salmacidis
    Species H. sinensis
    Species H. thomseni
    Species H. umfula

Taxon Information

The Genus Hydra has been reported (or is assumed) to occur in fresh waters. This taxon has been reported from Wisconsin.

(These statements were generated automatically from the WInvertebrates database.)

Literature Records

  • Hydra, (Pechenik, 2015).
  • Hydra, [North America] (Slobodkin & Bossert, 2010).
  • Hydra, (Jankowski et al., 2008).
  • Hydra, common throughout the U.S., about 16 species [North America] (Smith, 2001).
  • Hydra, [North Central United States] (Underhill et al., 1982).
  • Chlorohydra, [North Central United States] (Underhill et al., 1982).
  • Hydra, [Lake Michigan, Milwaukee Area, Wisconsin] (Batha, 1974).
  • Hydra, (Hyman, 1959).
  • Chlorohydra, (Hyman, 1959).
  • Pelmatohydra, (Miller, 1936).
  • Hydra, (Welch & Loomis, 1924).


  • Pechenik, J.A. 2015. Biology of the Invertebrates, 7th edition. McGraw-Hill, NewYork.. 606 pp.
  • Slobodkin, L.B. & P.E. Bossert. 2010. Cnidaria. [in] J.H. Thorp & A.P. Covich (eds.). Ecology and Classification of North American Freshwater Invertebrates, 3rd edition: 125-142.
  • Jankowski, T., A.G. Collins & R. Campbell. 2008. Global diversity of inland water cnidarians. Hydrobiologia 595: 35-40. [Available online]
  • Smith, D.G. 2001. Cnidaria (Hydroids, jellyfish). Pennak's Freshwater Invertebrates of the United States, 4th edition: 61-76.
  • Underhill, J.C., W.D. Schmid & D.E. Gilbertson. 1982. Taxonomic Keys to the Common Animals of the North Central States, exclusive of the parasitic worms, terrestrial insects, and birds, 4th edition. 205 pp.
  • Batha, J.V. 1974. The distribution and ecology of the genus Hydra in the Milwaukee area of Lake Michigan. Ph.D. Dissertation, University of Wisconsin, Madison. 172 pp.
  • Hyman, L.H. 1959. Coelenterata. [in] W.T. Edmondson (ed.). Ward & Whipple Fresh-Water Biology, 2nd edition: 313-322.
  • Miller, D.E. 1936. A limnological study of Pelmatohydra with special reference to their quantitative seasonal distribution. Transactions of the American Microscopical Society 55(2): 123-193. [Available online]
  • Welch, P.S. & H.A. Loomis. 1924. A limnological study of Hydra oligactis in Douglas Lake, Michigan. Transactions of the American Microscopical Society 43: 203-235. [Available online]

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