.... gen. n. sp. is a member of the paraphyletic Rhodocrinitidae of the Diplobathrida and most closely related to Paradiabolocrinus from the Late Ordovician (Sandbian) of Laurentia. Goryeocrinus pentagrammos n. gen. n. sp. is characterized by having a pentameral, flat bowl-shaped calyx, a conspicuous...

... dimerocrinosus n. sp. Based upon calyx plate morphology a new Rhodocrinitidae species was erected, Monstrocrinus incognitus n. sp. The genera Exaesiodiscus, Laudonomphalus, and Monstrocrinus were previously described from the Devonian of Amazonas Basin. Exaesiodiscus dimerocrinosus is also identified from...

... included in this group are currently classified as belonging to the Rhodocrinitidae. The characters uniting this clade are: (1) the presence of 15–20 arm openings, and (2) a maximum of two bifurcations in the fixed and free brachials, both of which are synapomorphies ( Fig. 2 , Node H). Other clades have...

... venation and a defensive adaptation 380 William I. Ausich and Nikki E. Zehler Recovery of Laurentian cyclocystoids following Late Ordovician extinctions (Brass eld Formation, Llandovery; southwestern Ohio) 386 Hyeonmin Park and Dong-Chan Lee Goryeocrinus pentagrammos n. gen. n. sp. (Rhodocrinitidae...

.... These two genera form a clade with Goyacrinus , Anthracocrinus , and Rheocrinus , all of which are assigned to the family Anthracocrinidae. Although Cotylacrinna is currently assigned to Rhodocrinitidae rather than Anthracocrinidae, it has been advocated that this genus be reassigned...

...Table 2 —Character matrix of diagnostic characters of the Ordovician diplobathrid camerates Rhodocrinitidae and Archaeocrinidae ...

... & Roemer, 1855 sensu   Kolata, 1982 Family Rhodocrinitidae Roemer in   Bronn & Roemer, 1855 sensu   Kolata, 1982 Genus Diabolocrinus   Wachsmuth and Springer, 1897 Type species . Rhodocrinus vesperalis   White, 1880 , p. 252, pl. 1, figs 11, 12, a senior synonym of Diabolocrinus...

... spinosus . Tegmens of Devonian and Mississippian diplobathrids are only known from the Rhodocrinitidae. Rhipidocrinus crenatus crenatus (Goldfuss, 1831) (Devonian) has a large, multiplated tegmen with undifferentiated plating ( Fig. 11 .8, 11 .9). Gilbertsocrinus Phillips, 1836 has a highly...

..., and uniserial brachials. Fombuenacrinus also shares many similarities with Visocrinus Ausich et al., 2002 from the Katian of Spain. Visocrinus is currently assigned to Rhodocrinitidae but possesses most diagnostic features of Anthracocrinidae. Thus, family reassignment may be in order for this genus...

... elsewhere. Table 1 lists the distribution of crinoid taxa by family for known Rhuddanian faunas worldwide. Families with two or more occurrences in the Rhuddanian include the diplobathrid families Rhodocrinitidae and Dimerocrinitidae; the monobathrid family Patelliocrinidae; the cladid family...

... monobathrid affinities. The monobathrid assignment for Proexenocrinus was questioned in the Treatise on Invertebrate Paleontology (Ubaghs, 1978 , p. T441). Later, Proexenocrinus was revised, redescribed, and reassigned to the Rhodocrinitidae Roemer, 1855 , within the Diplobathrida Moore and Laudon...

... brachiopods (particularly Gigantoproductus sp.) and various crinoid columnals (compare with Aitkenhead et al. 1985 , p. 57). Class CRINOIDEA Miller, 1821 Subclass CAMERATA Wachsmuth & Springer, 1885 Order DIPLOBATHRIDA Moore & Laudon, 1943 Family RHODOCRINITIDAE Roemer...

... the Paleozoic among various clades through time. Distal coil holdfasts are most common among camerate crinoids, but they have also been reported for cladids and disparids. Gilbertsocrinus is a Rhodocrinitidae diplobathrid camerate crinoid, and distal coil holdfasts are known from additional rhodocrinitids...

... species at Trearne Quarry and occurs in only one blue-stained shale bed. Subclass Camerata   Wachsmuth and Springer, 1885 Order Diplobathrida   Moore and Laudon, 1943 Family Rhodocrinitidae Roemer in   Bronn and Roemer, 1855 , sensu   Kolata, 1982 Genus Cribanocrinus   Kirk, 1944...

.... Crenularium depressed in nodals. Internodals lack epifacets.’ Remarks . Donovan & Clark ( 1992 , p. 28) originally suggested that these crinoids were a member of the diplobathrid camerate family Rhodocrinitidae Roemer. This may be correct; the crinoid is probably a camerate or, less likely, a cladid...

.... The radial plates are not in contact around the entire calyx, placing the specimen in the Rhodocrinitacea. The morphology of Lutocrinus is included within the morphological disparity known for the Rhodocrinitidae. It is differentiated from similar genera as noted below. The bowl shape and height...

... Wachsmuth & Springer, 1885 Order Diplobathrida Moore & Laudon, 1943 Family Rhodocrinitidae Roemer, 1855 Genus Gilbertsocrinus Phillips, 1836 Type species. Gilbertsocrinus calcaratus Phillips, 1836 , by the subsequent designation of Bassler (1938 , p. 102) ( Ubaghs 1978...