hydrotheca


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Related to hydrotheca: perisarc

hydrotheca

(ˌhaɪdrəˈθiːkə)
n, pl -cae (-siː)
(Zoology) a cuplike depression or cavity which protects an individual animal in some marine invertebrate colonial animals
References in periodicals archive ?
The main diagnostic characters of Lovenella are the medusae with indefinite number of statocysts and polyp with hydrotheca well demarcated by a basal line, separating it from the operculum (Fraser, 1944; Kramp, 1959; Bouillon et al.
margin of the hydrotheca, number of annulations throughout the colony, and abundance of certain types of nematocyst) can be taxonomically frustrating and make identifications difficult.
The distal annulated zone is not stained, whereas in the hydrotheca the staining is intense again.