Pseudoconocrinus, Roux & Eléaume & Améziane, 2019

Roux, Michel, Eléaume, Marc & Améziane, Nadia, 2019, A revision of the genus Conocrinus d’Orbigny, 1850 (Echinodermata, Crinoidea, Rhizocrinidae) and its place among extant and fossil crinoids with a xenomorphic stalk, Zootaxa 4560 (1), pp. 51-84 : 79

Genus Pseudoconocrinus n. gen.

Type species. Conocrinus doncieuxi Roux, 1978c .

Diagnosis. Cup shape highly variable but never inverted conical, except in some juveniles; sutures between cup ossicles often conspicuous at least at base of basal circlet. Distal face of radial circlet with small central depression (ratio to radial ring diameter 0.20–0.30), long conspicuous interradial crests separating large subtrapezoidal synarthries about as wide as radials, muscular areas moderately concave with inner side slightly erect or not at all. Arms divided at IBr2ax, two kinds of axillaries found in association with cups, the larger wider than tall and the smaller substantially taller than wide, suggesting change through ontogeny or possible additional branching. Articulation IBr1+2 without trifascial pattern.

Included species. Conocrinus doncieuxi Roux, 1978 (Ypresian) , Democrinus maximus Brünnich Nielsen, 1915 (Danian) , Conocrinus tauricus Klikushin, 1982 (Thanetian) .

Remarks. The Thanetian species Conocrinus tauricus is known from a single aboral cup with distal face poorly preserved, columnals and primibrachials including one axillary that is as tall as it is wide; this may belong to Pseudoconocrinus n. gen. However, its syzygy of a radiate crenularium at IBr1+2 contrasts with the smooth synostosis observed in Eocene Conocrinus, Paraconocrinus n. gen. and Pseudoconocrinus n. gen.