Plakinidae
Plakinidae | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Oscarella lobularis , a member of the Plakinidae. |
||||||||||||
Systematics | ||||||||||||
|
||||||||||||
Scientific name of the subclass | ||||||||||||
Homoscleromorpha | ||||||||||||
Bergquist , 1978 | ||||||||||||
Scientific name of the order | ||||||||||||
Homosclerophorida | ||||||||||||
Dendy , 1905 | ||||||||||||
Scientific name of the family | ||||||||||||
Plakinidae | ||||||||||||
Schulze , 1880 |
The Plakinidae are a family from the class of horned silica sponges (Demospongiae). They are the only family of the order Homosclerophorida, which is the only order of the subclass Homoscleromorpha ( Gr .: uniformly hard). A total of 11 species are counted among the Plakinidae.
Members of the Plakinidae have a membrane between the epidermis and the layers further inside. This means that the epithelial and flagellum cells on the outside are no longer directly connected to the mesohyl , and a direct exchange of substances or cells is probably no longer possible.
Furthermore, the Plakinidae have only small, but very evenly formed spicules . The larvae of the Plakinidae appear as free-swimming, two-part blastula (so-called amphiblastula).
Individual evidence
- ↑ http://www.biolib.cz/en/taxon/id301817/
- ↑ http://palaeos.com/metazoa/porifera/homoscleromorpha.html
Web links
- van Soest, R. (2010). Homosclerophorida. In: Van Soest, RWM, Boury-Esnault, N., Hooper, JNA, Rützler, K, de Voogd, NJ, Alvarez, B., Hajdu, E., Pisera, AB, Vacelet, J. Manconi, R., Schoenberg, C., Janussen, D., Tabachnick, KR, Klautau, M. (Eds) (2010). World Porifera database. Homosclerophorida