Metacrininae Klikushin 1977
Creators
- 1. Muséum national d'Histoire naturelle, UMR 7205 ISYEB MNHN-CNRS-UPMC-EPHE, Département Systématique et Évolution, CP
- 2. Centre " Louis Lortet de conservation et d'étude des collections (Musée des Confluences, Lyon) 13 A, rue Bancel - 69007 Lyon, France. https: // orcid. org / 0000 - 0002 - 4582 - 8990
Description
Subfamily Metacrininae Klikushin, 1977
Remarks. Metacrininae differ from all other Isocrinida in having more than 2 IBr with IBr2 bearing the first pinnule, and a muscular synarthry at IIBr1+2. The primibrachitaxis has a synostose at IBr4+5 when the number of IBr is>4. Their stalk symplexies display closed ZP and axial grooves in ZIP (Roux 1977, 1981). Two genera with a synostosis at IBr1+2 are distinguished in extant Metacrininae (Améziane-Cominardi 1991, Bourseau and Roux 1989, Hess 2011, Roux 1981): Saracrinus with usually 3–6 IBr (mode 4) and <10 IIBr, and Metacrinus having usually>4 IBr (mode 7) and>10 IIBr. The Eocene species Metacrinus fossilis Rasmussen, 1980 and Eometacrinus australis Baumiller and Gazdzicki, 1996 have a proximal crown with 5 IBr and 9–10 IIBr. Such an arm pattern is intermediate between Saracrinus and Metacrinus. Eometacrinus differs in having an axial ligamentary synarthry at IBr1+2. Metacrinus seymouriensis Rasmussen, 1980 is only known from pluricolumnals found in the Maastrichtian.
Notes
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Linked records
Additional details
Identifiers
Biodiversity
- Family
- Isselicrinidae
- Kingdom
- Animalia
- Order
- Isocrinida
- Phylum
- Echinodermata
- Scientific name authorship
- Klikushin
- Taxon rank
- subFamily
- Taxonomic concept label
- Metacrininae Klikushin, 1977 sec. Roux & Philippe, 2021
References
- Klikushin, V. G. (1977) Sea lilies of the genus Isselicrinus. Paleontologicheskiy Zhurnal, 1, 87 - 95 [in Russian]
- Ameziane-Cominardi, N. (1991) Distribution bathymetrique des pentacrines du Pacifique occidental. Essai de modelisation et d'application aux faunes du Lias (problemes de tectono-eustatisme au cours du rifting tethysien). Documents du Laboratoire de Geologie, Lyon, 116, 1 - 253.
- Bourseau, J. P. & Roux, M. (1989) Echinodermes: Crinoides Pentacrinidae (MUSORSTOM 2 & CORINDON 2). Memoires du Museum National d'Histoire Naturelle, Paris, A 143, 113 - 201.
- Hess, H. (2011) Isocrinida. In Hess, H., Messing, C. G. & Ausich, W. I. (Eds.), Treatise on Invertebrate Paleontology, Part T, Echinodermata 2 Revised, Crinoidea. Vol. 3. University of Kansas Press, Lawrence, Kansas, pp. 42 - 69. https: // doi. org / 10.17161 / dt. v 0 i 0.5392
- Roux, M. (1981) Echinodermes: Crinoides Isocrinidae. Memoires O. R. S. T. O. M., Paris, 91, 477 - 543.
- Rasmussen, H. W. (1980) Crinodeos del Cretacico superior y del Terciario inferior de la isla Vicecomodoro Marambio (Seymour Island), Antarctica. Contribucion del Instituto Antarctico Argentino, 261 (4), 79 - 97.
- Baumiller, T. K. & Gazdzicki, A. (1996) New crinoids from the Eocene La Meseta formation of Seymour Island, Antarctic Peninsula. Palaeontologia Polonica, 55, 101 - 116.