Cromyocrinacea

Ulocrinus sp., from Ammonit.ru.

Belongs within: Dendrocrinida.
Contains: Cromyocrinidae.

The Cromyocrinacea are a group of crinoids with bowl-shaped cups and sparsely branching arms known from the Carboniferous and Permian periods (Moore et al. 1978).

Characters (from Moore et al. 1978): Cup bowl-shaped, with or without basal concavity, radials with plenary articular facets, two or three anals in cup. Anal sac not prominent. Arms uniserial or biserial, five to 20 or more, branching confined to primibrachs 1 and secundibrachs 1. Stem transversely circular.

Cromyocrinacea [Cromyocrinites]
    |  i. s.: Cadocrinus Wanner 1924 [Cadocrinidae] ML78
    |           `--*C. variabilis (Wanner 1916) [=Hydreionocrinus variabilis] ML78
    |--Eupachycrinidae ML78
    |    |--Eupachycrinus Meek & Worthen 1865 ML78
    |    |    `--*E. quatordecimbrachialis (Lyon 1857) [=Graphiocrinus quatordecimbrachialis] ML78
    |    `--Intermediacrinus Sutton & Winkler 1940 ML78
    |         |--*I. asperatus (Worthen 1882) [=Eupachycrinus asperatus] ML78
    |         `--I. davidsoni ML78
    `--+--Cromyocrinidae M01
       `--Ulocrinidae M01
            |--Ureocrinus Wright & Strimple 1945 ML78
            |    `--*U. bockschii (Geinitz 1845) [=Poteriocrinus bockschii] ML78
            |--Probletocrinus Strimple & Moore 1971 ML78
            |    `--*P. curtus Strimple & Moore 1971 ML78
            |--Tyrieocrinus Wright 1945 ML78
            |    `--*T. laxus Wright 1945 ML78
            `--Ulocrinus Miller & Gurley 1890 ML78
                 |--*U. buttsi Miller & Gurley 1890 ML78
                 |--U. convexus ML78
                 |--U. elongatus Strimple 1961 UL78
                 `--U. fistulosus U78

*Type species of generic name indicated

REFERENCES

[M01] McIntosh, G. C. 2001. Devonian cladid crinoids: families Glossocrinidae Goldring, 1923, and Rutkowskicrinidae new family. Journal of Paleontology 75 (4): 783–807.

[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).

[U78] Ubaghs, G. 1978. Skeletal morphology of fossil crinoids. In: Moore, R. C., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt T. Echinodermata 2. Crinoidea vol. 1 pp. T58–T216. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).

[UL78] Ubaghs, G., N. G. Lane, H. Wienberg Rasmussen & H. L. Strimple. 1978. Evolution. In: Moore, R. C., & C. Teichert (eds) Treatise on Invertebrate Paleontology pt T. Echinodermata 2. Crinoidea vol. 2 pp. T275–T316. The Geological Society of America, Inc.: Boulder (Colorado), and The University of Kansas: Lawrence (Kansas).