| German | German Das marine, stockbildende Hydrozoon wächst auf Schneckengehäusen, die von Einsiedlerkrebsen bewohnt sind. Nähr-, Geschlechts-, Tentakel- und Wehrpolypen und ihre Funktionen; entodermales Kanalsystem der Stoffverteilung als Kommunikationssystem des Stockes. Nahrungstransport durch peristaltische Pulsationen. |
| English | English The colony of the marine hydroid Hydractinia echinata grows symbiontically on shells of hermit crabs. It develops four types of hydranths: gastrozooids, gonozooids, spiralzooids, tentaculozooids. These polyps and their main behavioural reactions are demonstrated. The hydranths represents "organs" of a suprapersonal individual, that is the whole colony, and are interconnected by a system of endodermal channels through which fluid and food are distributed. Pulsations of the hydranths and of the stolonial endodermal tubes provide forces for the transport. |
