zurück

Arch, Protistenk. Bd. 112, S. 30-64 (1970)

I. Zoologisches Institut der Universität Erlangen-Nürnberg (Vorstand: Prof. Dr. R. SIEWING)

Epistylis galea EHRENBERG, ein polymorphes Peritrich

Von DIETER MATTHES ünd JÖRG SCHEUBEL

Mit 30 Abbildungen

Summary

In the fully developed colony of Epistylis galea, macrozooids and microzooids occur in addition to the normal animals. During the division of the daughter animals, plasma bridges remain. Zooid units are formed, which have up to 16 separate individuals. Through this building of units, a mutual influence of the zooids is possible. Most of the macrozooids leave the colony (mainly in the night) as telotrochs and build an new colony as primary zooid. In the early morning hours the microzooids leave their stalks and conjugate as minrogamonts with the primary zooid. After the fourth division the zooids remain joined by means of the plasma bridges. The colony obtains a fan-shaped structure and consists of 8 main fans as a rule. The differentation to macrozooids and microzooids beginns three division steps before the final state of a portion fan. Some of the macrozooids of the fully developed colony encyst themselves. We found E. galea in a carp pond on Iris and Typha. The spreading of E. galea is strongly dependent upon the pH value.