Hyocrinidae with three basals with distinct sutures. Width of distal radial articular facet 40-50 percent of upper ... [details]
Hyocrinidae with structure of cup unknown. Second nonmuscular articulation between brachials 4-5; middle part of arm ... [details]
Hyocrinidae with Basals fused or with a few inconspicuous sutures, aboral side of basal circlet flanged. Arms ... [details]
Hyocrinidae with basals fused; aboral side of basal circlet flanged. Arms 5, exceptionally branching at brachial 4. ... [details]
Hyocrinidae with basals fused or basal circlet with 1-3 sutures. Arms moderately narrow. Width of distal radial ... [details]
Articulata with cup thin walled, hollow, formed by basals and radials; infrabasals absent; basals fused or with 1 ... [details]
Hyocrinidae with basals 3 or fused, forming a circlet without distinct sutures. Width of distal radial articular ... [details]
Hyocrinidae with basals 3 or fused. The most frequent proximal arm pattern with second nonmuscular articulation ... [details]