Systematics
There are approximately 25 species, grouped into two genera in the single family Beroidae. The family and order were named in 1825 or 1829 by the German naturalist Johann Friedrich Eschscholtz.
- The genus Beröe includes nearly all types of class and is distributed worldwide. One of the best known is reflected in the North spread Melonenqualle (Beröe gracilis). In Beröe species is mundabgewandte (aboral) side down.
- The genus Neis is monotypical, containing only one species, Neis cordigera(Lesson 1824), and is found only in the waters around Australia. In this type are located on the aboralen page two bogenartige progress rates, so that the middle intermediate aborale Sinnespol unlike the Beroiden not at the extreme end of the body is located (Note Artname cordigera: heart). The bogenartigen Fort sentences extend along the flanks of the animal and are Längsverlauf divided so that the impression of two sides "double wings". At the edges of these four "wings" is one rib band. The remaining four ribs on the lost tapes (relative to the "side wings") "upper" and "lower" body half. The ctenophore typical eight ribs number of bands is obtained, even if the tapes because of the particular body shape into two different groups - long training.
Read more about this topic: Nuda