Diagnosis
provided by World Register of Marine Species
Hyocrinidae with Basals fused or with a few inconspicuous sutures, aboral side of basal circlet flanged. Arms irregularly branching, first branching between brachials 8 to 15, additional branching more distally. Second synostosis between brachials 5-6. Maximum number of consecutive muscular articulations ~9. Distribution of nonmuscular articulations along middle arm irregular. First pinnule on brachial 4. Expansion of genital pinnules with numerous, imbricated, small plates, never in rows. Tegmen inflated, with well developed anal cone. Columnal symplexies with 7-16 crenular units of 1-4 crenulae, depending on columnal diameter.
- license
- cc-by-4.0
- copyright
- WoRMS Editorial Board
- bibliographic citation
- Hess H. (2011). Hyocrinida. <em>In: Hess H, Messing CG, Ausich WI (Eds.), Treatise on Invertebrate Paleontology, Part T, Echinodermata 2 Revised, Crinoidea, vol. 3. University of Kansas Press, Lawrence, Kansas.</em> 172–179.
- contributor
- Messing, Charles, C.G.
