Apical system weekly disjunct, semi-intercalary with an enlarged madreporite separating oculars II and IV; ... [details]

Endocyclic or exocyclic Atelostomata with a disjunct apical system; protosternous, meridosternous or amphisternous ... [details]

Endocyclic Atelostomata with weakly developed floscelle and nondisjunct apical system. [details]

Exocyclic Atelostomata with a typical disjunct and fused (to varying degrees) apical system, and a meridosternous ... [details]

Apical system strongly to weakly disjunct, ocular plates II and IV fused with genital plates 1 and 4 respectively; ... [details]

As defined by Mintz (1968: p. 1287), the order Disasteroida would include the genera Disaster L. Agassiz, 1836 and ... [details]

Originally Mintz (1968: p. 1286) included the following taxa: Galeropygus Cotteau, 1856, Hyboclypus L. Agassiz, ... [details]

Based on a unique poorly preserved specimen that has never been figured. It co-occurs with as Tithonia and agrees ... [details]

Mintz (1968: p. 1287-1288) elevated the Pourtalesiidae to ordinal rank "in recognition of their unique morphology ... [details]