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Doppellagige Kronenplatten: Ein neues anatomisches Merkmal paläozoischer Crinoiden und Revision der Familie Cupressocrinitidae (Devon)
Abstract and Figures
Based on material from the Middle Devonian of Germany (Eifel, Rheinisches Schiefergebirge), a clearly separated skeletal layer covering the plates of cup and arms is described in the crinoid family Cupressocrinitidae C.F. ROEMER, 1854. It is termed exoplacoid layer. Morphology, microstructure and geochemical signal of the layer are described, its functional morphology is discussed. Due to the structure of the exoplacoid layer, the new genera Robustocrinites n. gen. and Abbreviatocrinites n. gen. are erected within the hitherto monotypic family Cupressocrinitidae C.F. ROEMER, 1854. Robustocrinites n. gen. and Cupressocrinites GOLDFUSS, 1831, show a monolamellar exoplacoid layer and differ by additional morphological features from the new genus Abbreviatocrinites n. gen., which is characterised by a multilamellar exoplacoid layer. Several species of Cupressocrinites with developed multilamellar exoplacoid layer are transferred into the new genus. Abbreviatocrinites geminatus n. gen. n. sp. with an extensively developed multilamellar exoplacoid layer is new.
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