Grain is oblong to ellipsoidal free within the glume and its palea.
Central capsules ovate or ellipsoidal, its longer diameter twice to three times as large as the shorter.
Occupying most of it were three grey, ellipsoidal objects, smooth and featureless.
Therefore Phatnaspis repeats the characteristic formation of Coscinaspis, from which it differs in its ellipsoidal shell.
The nucleus is large and ellipsoidal, with characteristic longitudinal markings of chromatin.
