Description of Nassellaria

Polycystines, body plan typically not spherical, actinopodia arise from a pore plate at one pole of the central capsule, skeleton when present composed of spicules, rings, other geometric shapes or single or multi-segmented latticed chambers. A feature of primary importance for the classification of the Nassellaria is the internal skeleton. The internal skeleton consists of a complex set of spines and connecting bars enclosed in the cephalis, which allow comparison of homologous structures in forms differing widely in their external morphology.