Gymnolaemata

Reteporella grimaldii

The Gymnolaemata form a class of bryozoans ( Ectoprocta, also referred to as Bryozoa ), which is found in salt water (marine ) and freshwater ( limnic ). This class includes two trims, the Ctenostomata, with about 50 genera, and the Cheilostomata, with about 600 genera.

Construction

The largely marine Gymnolaemata form the most species-rich class with about 650 genera. The Cystide are usually box-or füllhornförmig. The animals in the colony are separated by partition walls having pores which are filled with tissue. There is no body wall muscles. The Gymnolaemata are again divided into two orders: The walls of the Ctenostomata (about 50 genera ) are membranous or gelatinous. You do not Ooecien or avicularia. The Cystidverschluss is accomplished by folding a membranous neck collar and the individual animals are largely isolated. The walls of the Cheilostomata (about 600 species ) are calcified, and the cystid has a lid lock on. Heterozoide are frequently encountered and the embryonic development takes place in brood chambers.

System

• Class: Gymnolaemata Order: Ctenostomata Subordination: Alcyonidiina
• Subordination: Flustrellidrina
• Subordination: Victorellina
• Subordination: Paludicellina
• Subordination: Vesicularina
• Subordination: Stoloniferina

• Subordination: Inovicellata
• Subordination: Scrupariina
• Subordination: Malacostega
• Subordination: Flustrina
• Subordination: Ascophora