- among the calicles that shield the hydrants in some Hydroidea (Thecaphora).
- one of many calicles which, in some Hydroidea (Thecaphora), shield the hydrants. See Illust. of hydroidea, and campanularian.
- In zoology, a little chitinous cup where each polypite for the Sertularidia and Campanularida is protected; a calycle. See cut-under Campanularia.
Definition for "hydrotheca"
- among the calicles that shield the hydrants in…
Variant for "hydrotheca"