Ampelocrinidae

Armenocrinus collinsi, copyright University of Iowa.

Belongs within: Articulata.

The Ampelocrinidae are a group of crinoids with a relatively low base to the cup known from the Carboniferous and Permian periods (Moore et al. 1978).

Characters (from Moore et al. 1978): Crown tall, subcylindrical or expanding. Cup low to medium bowl shaped or truncate conical, with upflared infrabasals, visible from side, or infrabasals in shallow basal concavity and not visible from side; radials large, articular facet wide, plenary, short, sloping outward-upward; one dominant anal plate in cup. Anal sac slender, maybe recurved or straight. Arms usually ten but may branch twice or not at all; primibrachs 2–4 axillary except that in younger forms primibrachs 1 and 2 may fuse and become nonaxillary; long pinnules on opposite sides of alternate brachials unless syzygial pairs are present. Stem transversely round, subpentagonal, or decidedly pentagonal, with or without cirri.

<==Ampelocrinidae [Ampelocrininae]
|--Ampelocrinus Kirk 1942ML78
| `--*A. bernhardinae Kirk 1942ML78
|--Arroyocrinus Lane & Webster 1966ML78
| `--*A. popenoei Lane & Webster 1966ML78
|--Moundocrinus Strimple 1939ML78
| `--*M. osagensis Strimple 1939ML78
|--Polusocrinus Strimple 1951ML78
| `--*P. avanti Strimple 1951ML78
|--Proampelocrinus Gupta & Webster 1974ML78
| `--*P. himalayaensis Gupta & Webster 1974ML78
|--Spheniscocrinus Wanner 1937ML78
| `--*S. spinosus Wanner 1937ML78
|--Chlidonocrinus Strimple & Watkins 1969ML78
| |--*C. echinatus Strimple & Watkins 1969ML78
| `--C. ornatusML78
|--Halogetocrinus Strimple & Moore 1971ML78
| |--*H. paucus (Strimple 1951) [=Aesiocrinus paucus]ML78
| `--H. tumidusML78
`--Armenocrinus Strimple & Horowitz 1971ML78
|--*A. watersi Strimple & Horowitz 1971ML78
|--A. collinsiML78
`--A. neglectusML78

*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).

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