Statoblast
As statoblast refers to the serving to wintering and dissemination permanent stage at bryozoans ( bryozoans ). These brood buds have a solid cover and some swimming organelles and barbs; they are formed in autumn on the funiculus ( mesodermal connecting cord between the intestine and body wall) and are therefore also referred to as winter buds . Some species of bryozoa also use statoblasts to survive dry seasons.
Statoblasts are only found in the Phylactolaemata ( freshwater moss ). There are three types of them:
- Flottoblasts (free statoblasts with a swimming ring; they are released to the outside),
- Sessoblasts (sitting statoblasts with a ring reduced to a wreath; they are connected to the substrate with cement),
- Piptoblasts (statoblasts without a ring, but also not fixed; they remain in the tubes; only present in Fredericella ).
The sessoblasts serve to maintain and intensify the settlement of a narrower area, while the flottoblasts, which can be carried over long distances by currents, wind and animals, ensure extensive distribution. The latter is also the case for the piptoblasts, which can be spread through fragments of colony branches.
Species of the subclass Gymnolaemata form analogous but differently structured hibernacles . Both types belong to the buds in zoology.
Individual evidence
- ↑ Senckenberg Natural History Museum : What are bryozoa? ( Memento of the original from December 16, 2005 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ a b Science-Online-Lexica: Entry on statoblasts in the Lexicon of Biology
- ↑ See p. 40ff, E. Wöss: Biology of the freshwater moss animals (Bryozoa). In: Denisia 16 (2005): 21-48.
- ^ F. Wiebach: Bryozoa . In: P. Brohmer et al. (Ed.): Die Tierwelt Mitteleuropas , 1 (8): 1–56, plates 1–19. Quelle & Meyer in Leipzig (1960).
