WoRMS taxon details
Hyocrinus Thomson, 1876
Hyocrinus (Hyocrinus) Mironov & Sorokina, 1998 · unaccepted (change in rank)
- Species Hyocrinus bethellianus Thomson, 1876
- Species Hyocrinus foelli Roux & Pawson, 1999
- Subgenus Hyocrinus (Belyaevicrinus) Mironov & Sorokina, 1998 accepted as Belyaevicrinus (Mironov & Sorokina, 1998) (change in rank)
- Species Hyocrinus (Belyaevicrinus) latipinnulus Mironov & Sorokina, 1998 accepted as Belyaevicrinus latipinnulus (Mironov & Sorokina, 1998) (synonym)
- Subgenus Hyocrinus (Hyocrinus) Mironov & Sorokina, 1998 accepted as Hyocrinus Thomson, 1876 (change in rank)
- Species Hyocrinus (Hyocrinus) bethellianus Thomson, 1876 accepted as Hyocrinus bethellianus Thomson, 1876 (no subgenus)
- Species Hyocrinus biscoitoi Roux, 2004 accepted as Parahyocrinus biscoitoi (Roux, 2004) (basionym)
- Species Hyocrinus cyanae Bourseau, Améziane-Cominardi, Avocat & Roux, 1991 accepted as Parahyocrinus cyanae (Bourseau, Améziane-Cominardi, Avocat & Roux, 1991) (basionym)
- Species Hyocrinus giganteus Roux & Pawson, 1999 accepted as Parahyocrinus giganteus (Roux & Pawson, 1999) (basionym)
marine, brackish, fresh, terrestrial
Thomson, C.W. (1876). Notice of new living crinoids belonging to the Apiocrinidae. <em>Journal of the Linnean Society of London, Zoology.</em> 13: 47–109., available online at https://www.biodiversitylibrary.org/page/31597305 [details]
Messing, C.; Gondim, A.I.; Markello, K.; Poatskievick Pierezan, B.; Taylor, K.; Eléaume, M. (2025). World List of Crinoidea. Hyocrinus Thomson, 1876. Accessed through: World Register of Marine Species at: https://www.marinespecies.org/aphia.php?p=taxdetails&id=340805 on 2025-04-16
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Nomenclature
original description
Thomson, C.W. (1876). Notice of new living crinoids belonging to the Apiocrinidae. <em>Journal of the Linnean Society of London, Zoology.</em> 13: 47–109., available online at https://www.biodiversitylibrary.org/page/31597305 [details]
basis of record 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. [details]
basis of record 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. [details]
Other
Present Inaccurate Introduced: alien Containing type locality
From editor or global species database
Diagnosis Hyocrinidae with basals 3 or fused, forming a circlet without distinct sutures. Width of distal radial articular facet 33 to 44 percent of upper width of radial. No lateral spines or flattened projections on proximal brachials and pinnulars. Second and third nonmuscular articulations between brachials 3-4 and 5-6. First pinnule typically on brachial 6, rarely on 5. Successive series of 2-3 brachials united by synostosis in mid-arm, never successive muscular articulations. Expansion of genital pinnules with one row of H-shaped plates, but shape of cover plates very variable and useful at species level only (Roux, 2004, fig. 7). Cover plates consisting of 2-3 pairs corresponding to each pinnular. Tegmen typically low, sometimes inflated. Oral plates typically large, forming high oral cone where tegmen low. Anal cone low. Columnal symplexies with 6-10 crenular units of one crenula each, or more in larger species such as H. biscoitoi (number of crenular units and crenulae unknown in H. giganteus). [details]
