Nerocrinus petri n. gen. n. sp. is described from mid Early Jurassic sediments of the Umbro-marchean succession (Central Apennines, Italy). It shares some characters with dadocrinids and cyrtocrinids, respectively. The cup is composed of RR and BB and the presence of arficular facets for the arms, of a very advanced type, deeply enclosed between high interradial projections. The new genus is ascribed to the new family Nerocrinidae, and included in the suborder Cyrtocrinina, even if an attribution to Dadocrinina cannot be ultimately excluded due to the presence of BB. In either case, Nerocrinus petri is, at the moment, the most likely link between basal dadocrinid and cyrtocrinid crinoids.
The oldest cyrtocrinid, Nerocrinus petri n. gen. n. sp., and the Nerocrinidae n. fam / Manni, Riccardo Pier Celestino; Nicosia, Umberto. - STAMPA. - (1999), pp. 327-331. (Intervento presentato al convegno Echinoderm Research 1998 tenutosi a Milano nel 7-12 settembre 1998).
The oldest cyrtocrinid, Nerocrinus petri n. gen. n. sp., and the Nerocrinidae n. fam.
MANNI, Riccardo Pier Celestino;NICOSIA, Umberto
1999
Abstract
Nerocrinus petri n. gen. n. sp. is described from mid Early Jurassic sediments of the Umbro-marchean succession (Central Apennines, Italy). It shares some characters with dadocrinids and cyrtocrinids, respectively. The cup is composed of RR and BB and the presence of arficular facets for the arms, of a very advanced type, deeply enclosed between high interradial projections. The new genus is ascribed to the new family Nerocrinidae, and included in the suborder Cyrtocrinina, even if an attribution to Dadocrinina cannot be ultimately excluded due to the presence of BB. In either case, Nerocrinus petri is, at the moment, the most likely link between basal dadocrinid and cyrtocrinid crinoids.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
