|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Rhombifera - Callocystitidae
It was assigned to Apiocystitinae by Ausich and Schumacher (1984); to Rhombifera by Sepkoski (2002); and to Callocystitidae by Paul and Rozhnov (2016).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|W. I. Ausich and G. A. Schumacher 1984||Apiocystitinid with open ra- dial circlet; five ambulacra of variable length, ambulacra I, II, V long, and ambulacrum III very short; four disjunct pectinirhombs (B2/ IL2, L1/R5, L4/R3, L3/R3) with one-half of chevron form and the other of half-moon form; IL4 and IL5 large and elongate; and a proximal column composed of two layers of plates.|