Shell outline triangular to oval, cephalis partly submerged into thorax. Shell-wall thick. Antarctissa strelkovi (types of cephalis, left picture; A. denticulata group? intro) and Antarctissa longa differ from Antarctissa denticulata by having thinner and spinier shell-walls. Shell height: 100-160 µm.
Ref.: Petrushevskaya (1967).