Delocrinus sp., from the Pennsylvanian Atlas of Ancient Life.

Belongs within: Erisocrinacea.

The Catacrinidae are a group of crinoids with a tall, cylindrical crown known from the Upper Carboniferous and Permian periods (Moore et al. 1978).

Characters (from Moore et al. 1978): Crown tall, cylindrical. Cup low bowl-shaped, smooth plated or rugose, with moderately deep and narrow basal concavity, proximal tips of radials above basal plane of cup or barely reaching it; articular facets of radials subhorizontal, occupying full width of plates; single upright anal plate (X) in cup extending above radial summits and distally recumbent inward in some genera. Anal sac cylindrical, not reaching above arms, composed of small polygonal plates in vertical rows, pointed at summit. Arms ten, biserial, branching isotomously on primibrachs 1, which uncommonly is produced laterally as stout long spine, pinnulate. Stem transversely round, homeomorphic.

Catacrinidae [Arrectocrininae, Catacrininae, Palmerocrininae]
    |--Lobalocrinus Knapp 1969 ML78
    |    `--*L. wolforum (Moore & Plummer 1940) [=Delocrinus wolforum] ML78
    |--Palmerocrinus Knapp 1969 ML78
    |    `--*P. comptus Knapp 1969 ML78
    |--Paraplasocrinus Moore & Plummer 1938 ML78
    |    `--*P. transitorius (Wanner 1916) [=Cibolocrinus transitorius] ML78
    |--Pyndaxocrinus Knapp 1969 ML78
    |    `--*P. separatus (Strimple 1949) [=Delocrinus separatus] ML78
    |--Subarrectocrinus Knapp 1969 ML78
    |    `--*S. perexcavatus (Moore & Plummer 1940) [=Delocrinus perexcavatus] ML78
    |--Arrectocrinus Knapp 1969 [incl. Metarrectocrinus Knapp 1969] ML78
    |    |--*A. abruptus (Moore & Plummer 1940) [=Delocrinus abruptus] ML78
    |    `--‘Delocrinus’ major Weller 1909 [=*Metarrectocrinus major] ML78
    |--Endelocrinus Moore & Plummer 1940 ML78
    |    |--*E. fayettensis (Worthen in Meek & Worthen 1873) [=Eupachycrinus fayettensis] ML78
    |    |--E. matheri ML78
    |    `--E. solus ML78
    `--Delocrinus Miller & Gurley 1890 (see below for synonymy) ML78
         |--*D. hemisphericus (Miller & Gurley 1890) (see below for synonymy) ML78
         |--D. malaianus Wanner 1916 [=*Asaccocrinus malaianus] ML78
         |--D. ponderosus Strimple 1949 [=*Palmatocrinus ponderosus] ML78
         |--D. stullensis Strimple 1947 [=*Cathetocrinus stullensis] ML78
         `--D. wewokaensis Strimple 1940 [=*Wewokacrinus wewokaensis] ML78

Delocrinus Miller & Gurley 1890 [=Catacrinus Knapp 1969; incl. Asaccocrinus Wanner 1949, Cathetocrinus Knapp 1969, Palmatocrinus Knapp 1969, Wewokacrinus Knapp 1969] ML78

*Delocrinus hemisphericus (Miller & Gurley 1890) [=Poteriocrinus hemisphericus, D. subhemisphericus Moore & Plummer 1940, *Catacrinus subhemisphericus] ML78

*Type species of generic name indicated


[ML78] Moore, R. C., N. G. Lane, H. L. Strimple, J. Sprinkle & R. O. Fay. 1978. Inadunata. In: Moore, R. C., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt T. Echinodermata 2. Crinoidea vol. 2 pp. T520–T759. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

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