hydrotheca

the cup-like part of the perisarc of colonial COELENTERATES which surrounds and protects the polyp.

Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005

References in periodicals archive

Oddly, the polyp of Lovenella gracilis Clarke, 1882 is defined by the operculum being a continuation of the hydrothecal wall, therefore lacking a basal line separating operculum and hydrotheca (Calder, 1971, 1975).

Posicion taxonomica de Lovenella gracilis Clarke, 1882 (Lovenellidae, Hydrozoa): nuevas evidencias de microanatomia justifican su permanencia en el genero Lovenella Hincks, 1868

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.

Shallow-water Campanulariidae (Hydrozoa, Leptothecatae) from Northern Bahia, Brazil

The distal annulated zone is not stained, whereas in the hydrotheca the staining is intense again.

Shaping of colony elements in laomedea flexuosa hinks (Hydrozoa, Thecaphora) includes a temporal and spatial control of skeleton hardening

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