Specimen of Halammohydra, photographed by Allen G. Collins.

Belongs within: Hydrozoa.

Halammohydra is a genus of minute hydrozoans living interstitially between sand grains.

Characters (from Carlton 2007): Medusa only; polyp absent. Minute (0.5-2 mm), highly reduced; entirely ciliated; consisting mostly of a manubrium with two whorls of long, contractile tentacles; statocyst present between each pair of tentacles; aboral adhesive organ.

<==Halammohydra Remane 1927 [Halammohydridae] CS-P86
    |  i. s.: H. andamanensis Rao 1967 CS-P86
    |         H. intermedia Clausen 1967 CS-P86
    |         H. sagarensis Rao & Misra 1980 CS-P86
    |--H. (Halammohydra) CS-P86
    |    |--H. (H.) octopodides Remane 1927 CS-P86
    |    `--H. (H.) schulzei Remane 1927 CS-P86
    |--H. (Goulvenhydra Swedmark & Teissier 1967) CS-P86
    |    `--H. (*G.) vermiformis Swedmark & Teissier 1957 CS-P86
    `--H. (Skodenhydra Swedmark & Teissier 1967) CS-P86
         |--H. (*S.) adherens Swedmark & Teissier 1958 CS-P86
         |--H. (S.) cauhani Rao 1975 CS-P86
         `--H. (S.) coronata Clausen 1967 CS-P86

Nomina nuda: Halammohydra coronata var. reducta Clausen in Clausen &Salvini-Plawen 1986 CS-P86
             Halammohydra neglecta Clausen in Clausen & Salvini-Plawen 1986 CS-P86

*Type species of generic name indicated


Carlton, J. T. (ed.) 2007. The Light and Smith Manual: Intertidal Invertebrates from Central California to Oregon, 4th ed. University of California Press.

[CS-P86] Clausen, C., & L. v. Salvini-Plawen. 1986. Cnidaria. In Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) (L. Botosaneanu, ed.) pp. 33-42. E. J. Brill / Dr. W. Backhuys: Leiden.

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