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| Bryozoa (Moostierchen) Bryozoa |
Moostiers usually form colonies (zoarium) from several single animals (zooids). The single zooid consists of a soft body and a protective shell, the surrounding, extrazooidal, skeleton (zooecium). The soft body consists of the polypid (the front body, free-moving parts) and the cystid (= the rear body, into which the polypid can be drawn completely by means of retraction muscles). The polypid is formed from the cystide. The digestive system is divided into the mouth, middle, rectum and anus. The anus is not terminated, but comes through the U-shaped intestine near the mouth outside the tentacle crown (called Lophophor). The mouth surrounds tentacles, which sit on a circular or two-part Lophophor. The intestinal canals of the single animals are not connected with each other as in the case of the nettle colonies.
Within the colonies there are workings. Strongly formed animals form stalk members, tendrils or root threads. Other single animals form sex cells, while others are aminated or avicular-like avicularia or vibracularia, which prevent the detection of foreign organisms on the colony. In the specialized animals of the colony, both the tentacle crown and usually the intestine are formed. |
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Bryozoa (Moostierchen) Bryozoa |
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