Paradelocrinidae

Posterior (top), oral and aboral (bottom) views of cup of Atokacrinus obscurus, from Moore et al. (1978).

Belongs within: Erisocrinacea.

The Paradelocrinidae are a group of relatively small crinoids known from the Upper Carboniferous and the Permian (Moore et al. 1978).

Characters (from Moore et al. 1979): Base of cup broadly to narrowly concave, moderate in depth or shallow; infrabasals five, downflared steeply or gendy, mostly covered by stem; proximal part or all of basals included in concavity; radials wide, with planate facets occupying full width of radials; anal X in notch between posterior radials, generally not visible from side. Arms ten, biserial except in lower portions, branching on axillary first primibrachs. Stem transversely round.

Paradelocrinidae [Atokacrininae]
    |--Paradelocrinus Moore & Plummer 1938 ML78
    |    `--*P. aequabilis Moore & Plummer 1938 ML78
    |--Lopadiocrinus Wanner 1916 ML78
    |    `--*L. granulatus Wanner 1916 ML78
    |--Neocatacrinus Knapp 1969 ML78
    |    `--*N. protensus (Moore & Plummer 1940) [=Paradelocrinus protensus] ML78
    |--Sublobalocrinus Knapp 1969 ML78
    |    `--*S. iolaensis (Strimple 1949) [=Paradelocrinus iolaensis] ML78
    `--Atokacrinus Knapp 1969 ML78
         |--*A. obscurus Knapp 1969 ML78
         `--A. decorus ML78

*Type species of generic name indicated

REFERENCES

[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).