Belongs within: Medusozoa.
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 1967CS-P86 | H. intermedia Clausen 1967CS-P86 | H. sagarensis Rao & Misra 1980CS-P86 |--H. (Halammohydra)CS-P86 | |--H. (H.) octopodides Remane 1927CS-P86 | `--H. (H.) schulzei Remane 1927CS-P86 |--H. (Goulvenhydra Swedmark & Teissier 1967)CS-P86 | `--H. (*G.) vermiformis Swedmark & Teissier 1957CS-P86 `--H. (Skodenhydra Swedmark & Teissier 1967)CS-P86 |--H. (*S.) adherens Swedmark & Teissier 1958CS-P86 |--H. (S.) cauhani Rao 1975CS-P86 `--H. (S.) coronata Clausen 1967CS-P86 Nomina nuda: Halammohydra coronata var. reducta Clausen in Clausen &Salvini-Plawen 1986CS-P86 Halammohydra neglecta Clausen in Clausen & Salvini-Plawen 1986CS-P86
*Type species of generic name indicated
References
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: Botosaneanu, L. (ed.) Stygofauna Mundi: A Faunistic, Distributional, and Ecological Synthesis of the World Fauna inhabiting Subterranean Waters (including the Marine Interstitial) pp. 33–42. E. J. Brill/Dr W. Backhuys: Leiden.