Metacrininae Klikushin 1977

• Main Authors: Roux, Michel, Philippe, Michel
• Format: Text
• Language: unknown
• Published: Zenodo 2021
• Subjects: Biodiversity; Taxonomy; Animalia; Echinodermata; Crinoidea; Isocrinida; Isselicrinidae; Antarctic; Antarctic Peninsula; Argentino; Rasmussen; Seymour; Seymour Island; Hess; Marambio; Antarc*; Antarctica
• Online Access: https://dx.doi.org/10.5281/zenodo.5572102; https://zenodo.org/record/5572102

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. : Published as part of Roux, Michel & Philippe, Michel, 2021, Early Miocene stalked crinoids (Echinodermata) from the southern Rhodanian basin (southeastern France). Paleoenvironments and taxonomy, pp. 301-331 in Zootaxa 5052 (3) on page 317, DOI: 10.11646/zootaxa.5052.3.1, http://zenodo.org/record/5572077 : {"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."]}