TABLE 17 in New Eocene species of the crinoid genera Holopus and Cyathidium (Cyrtocrinida: Holopodidae) from north-eastern Italy

TABLE 17. Composition of the crinoid fauna of Cengio dell’Orbo quarry based on MCZ residues (585 ossicles). br: brachial, Nid: number of individuals, Nid/T’: ratio of number of individuals for each taxon to total number of individuals, No: number of ossicles, No/T: ratio of number of ossicles for each taxon to total number of ossicles, T: total number of ossicles (585) in the sample examined, T’: total number of individuals (98) in total crinoid assemblage. Sizes given relatively to the usual range in the genus (sm: smaller size, us: usual size). Our identifications are based on the discriminating characters adopted by Roux et al. (2019) and Améziane et al. (2023) for extant and fossil taxa, Cainocrinus sp. = Isocrinus archiaci in Manni (2022), Conocrinus fusus = Fabianicrinus fusus n. gen. sp. nov. in Manni (2022). See text for explanations.
TaxaNoNo/TNidNid/T’PreservationOssiclessizeCyathidium30.5%33.1%usually goodaboral cupssmHolopus fabianii sp. nov.12922%88.2%usually goodaboral cups, brusChiampocrinus lobatus478%4748.0%goodaboral cupssmCainocrinus sp.15326%~4~4%usually goodcolumnalssmConocrinus fusus112%1111.2%variable to wornaboral cupsusConocrinus veronensis40.7%44.1%variable to wornaboral cupsusParaconocrinus sp.101.7%1010.2%variable to wellaboral cupssmBourgueticrinina22138%~6~6%variable to worncolumnalsusIndetermined30.5%33.1%variable to goodencrusted discssm