Plakinidae

Plakinidae
	Oscarella lobularis , a member of the Plakinidae.
Systematics
without rank:	Multicellular animals (Metazoa)
Trunk :	Sponges (Porifera)
Class :	Horned Silica Sponges (Demospongiae)
Subclass :	Homoscleromorpha
Order :	Homosclerophorida
Family :	Plakinidae
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

Web links

Commons : Plakinidae - collection of images, videos, and audio files

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

[1] ttp://www.biolib.cz/en/taxon/id301817/

[2] ttp://palaeos.com/metazoa/porifera/homoscleromorpha.html