echinoderms
An echinoderm () is any member of the phylum Echinodermata (). The adults are recognisable by their (usually five-point) radial symmetry, and include starfish, brittle stars, sea urchins, sand dollars, and sea cucumbers, as well as the sea li ...
belonging to the family
Schizasteridae
Schizasteridae is a family of echinoderms belonging to the order Spatangoida.
Genera:
* ''Abatus'' Troschel, 1851
* '' Aceste'' Thomson, 1877
* ''Agassizia'' Agassiz & Desor, 1847
* '' Aguayoaster'' Sanchez Roig, 1952
* '' Aliaster'' Valdinu ...
.
The genus has almost
cosmopolitan distribution
In biogeography, cosmopolitan distribution is the term for the range of a taxon that extends across all or most of the world in appropriate habitats. Such a taxon, usually a species, is said to exhibit cosmopolitanism or cosmopolitism. The ext ...