Homocrinidae

Ectenocrinus simplex assemblage, copyright James St. John.

Belongs within: Inadunata.

The Homocrinidae are a group of crinoids with small, conical cups known from the Middle Ordovician to the Middle Silurian (Moore et al. 1978).

Characters (from Moore et al. 1978): Cup small, conical; B, C, and E radials compound: anal X incorporated in cup between C and D radials.

Homocrinidae [Homocrinacea, Homocrinicae, Homocrinida]
    |--Ibexocrinus Lane 1970 ML78
    |    `--*I. lepton Lane 1970 A98, ML78
    |--‘Ascocrinus’ Jaekel 1918 non Barrande 1887 (n. d.) J18
    |    `--*A. bohemicus Jaekel 1918 J18
    |--Daedalocrinus Ulrich 1925 ML78
    |    `--*D. kirki Ulrich 1925 ML78
    |--Drymocrinus Ulrich 1925 ML78
    |    `--*D. geniculatus (Ulrich 1879) [=Heterocrinus geniculatus] ML78
    |--Sygcaulocrinus Ulrich 1925 ML78
    |    `--*S. typus Ulrich 1925 ML78
    |--Homocrinus Hall 1852 ML78
    |    |--*H. parvus Hall 1852 ML78
    |    `--H. rhenanus Jaekel 1918 J18
    `--Ectenocrinus Miller 1889 ML78
         |--*E. simplex (Hall 1847) [=Heterocrinus simplex] ML78
         `--E. grandis ML78

*Type species of generic name indicated

REFERENCES

[A98] Ausich, W. I. 1998. Early phylogeny and subclass division of the Crinoidea (phylum Echinodermata). Journal of Paleontology 72 (3): 499–510.

[J18] Jaekel, O. 1918. Phylogenie und System der Pelmatozoen. Paläontologische Zeitschrift 3: 1–128.

[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).