Cymbiocrinidae

Reconstruction of Aesiocrinus magnificus, from Moore et al. (1978).

Belongs within: Dendrocrinida.

The Cymbiocrinidae are a group of Carboniferous crinoids characterised by a basally impressed or invaginated cup and an elongate anal tube.

Characters (from Moore et al. 1978): Cup ranging from basally impressed bowl of medium height to very low with deep basal invagination; five infrabasal usually confined to basal concavity; five large to small basal; five medium to large radials, with articular facets filling width of these plates, sloping inward and short (except Aesiocrinus with relatively long facets); one anal plate in line with radials normally extended above cup summit (except Aenigmocrinus with two subequal anal plates on CD basal), followed by two tube plates or by single tube plate in some later forms. Anal tube slender and recurved in older forms but usually long and straight in later forms. Arms usually ten (five in Allosocrinus), uniserial, primibrachs 2 normally axillary (primibrachs 1 and 2 may fuse in later forms), brachials may be cuneate, syzygial pairs not uncommon. Column transversely subpentagonal to pentagonal, may become round.

Cymbiocrinidae
    |--Aenigmocrinus Strimple 1973 ML78
    |    `--*A. anomalus (Wetherby 1880) [=Poteriocrinus anomalus, P. anomalos] ML78
    |--Allosocrinus Strimple 1949 ML78
    |    `--*A. bronaughi Strimple 1949 ML78
    |--Lecobasicrinus Strimple & Watkins 1969 ML78
    |    `--*L. kickapoensis Strimple & Watkins 1969 ML78
    |--Paracymbiocrinus Burdick & Strimple 1973 ML78
    |    `--*P. ormondi Burdick & Strimple 1973 ML78
    |--Proallosocrinus Moore & Strimple 1973 ML78
    |    `--*P. glenisteri Moore & Strimple 1973 ML78
    |--Cymbiocrinus Kirk 1944 ML78
    |    |--*C. romingeri Kirk 1944 ML78
    |    `--C. contentus ML78
    |--Oklahomacrinus Moore 1939 ML78
    |    |--*O. supinus Moore 1939 ML78
    |    `--O. loeblichi ML78
    `--Aesiocrinus Miller & Gurley 1890 (see below for synonymy) ML78
         |--*A. magnificus Miller & Gurley 1890 ML78
         |--A. dilatatus ML78
         |--A. konincki [=Phialocrinus konincki; incl. Pentadia corona Dana 1849] F71
         |--A. nodosus (Etheridge 1892) [=Phialocrinus nodosus] F71
         |--‘*Phialocrinus’ patens Trautschold 1879 ML78
         |--A. princeps (Etheridge 1892) [=Phialocrinus princeps] F71
         |--A. secundus Washburn 1968 [incl. Cymbiocrinus anatomus Washburn 1968, C. cuneatus Washburn 1968] ML78
         |--A. stephensi (Etheridge 1892) [=Phialocrinus stephensi] F71
         `--‘*Pentadelocrinus’ twinensis Strimple 1939 ML78

Aesiocrinus Miller & Gurley 1890 [incl. Pentadelocrinus Strimple 1939, Phialocrinus Trautschold 1879 non Eichwald 1856, Phyalocrinus Trautschold 1870 (n. n.)] ML78

*Type species of generic name indicated

REFERENCES

[F71] Fletcher, H. O. 1971. Catalogue of type specimens of fossils in the Australian Museum, Sydney. Australian Museum Memoir 13: 1-167.

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