Carstenicrinus, 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 : 75

Genus Carstenicrinus n. gen.

Type species. Apiocrinus constrictus von Hagenow, in Quenstedt, 1876

Etymology. Genus dedicated to Carsten R. Kjaer (University of Aarhus), who provided Late Cretaceous and Danian crinoids from Denmark.

Diagnosis. Theca with proximale usually substantially taller than basals; distal face of aboral cup of Pseudoconocrinus - type (see below) without interradial process or thorn, large subtrapezoidal arm insertion on cup as wide as radials, brachial axillary at IBr2, articulation IBr1+2 without visible trifascial pattern. Campanian- Paleocene.

Included species. Apiocrinus constrictus von Hagenow, in Quenstedt, 1876 (= B. bruennichinielseni Ødum, in Jessen & Ødum, 1923 = Bourgueticrinus tenuis Rasmussen, 1961 ), Campanian-Maastrichtian; Bourgueticrinus baculatus Klikushin, 1982 , lower Campanian; B. danicus Brünnich Nielsen, 1913 , Danian.

Remarks. According to Kjaer & Thomsen (1999), B. bruennichinielseni corresponds to a thecal architecture that is intermediate between B. constrictus and B. danicus . Distinction between species is difficult using only external morphology, because of the wide range of variation in the relative height of thecal ossicles, as in Bourgueticrinus.