Reteocrinidae
Classification
Phylum: Echinodermata
Class: Crinoidea
Order: Diplobathrida
Family: Reteocrinidae (Wachsmuth & Springer, 1885)
Cincinnatian Genera: Gaurocrinus
Geologic Range
Middle Ordovician – Late Ordovician
Common Paleoecology
Reteocrinidae is an extinct family of stationary upper-level epifaunal suspension feeders
Description of the Family
- Calyx obconical
- Thecal walls thin and weak
- Infrabasals five
- Basals large
- Tegmen low, slightly convex
- No anal tube
- Arms uniserial
- Stem pentagonal or round in cross section
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Treatise on Invertebrate Paleontology, Part T, Vol. 2(2) (1978):
Treatise on Invertebrate Paleontology, Part T, Vol. 2(2) (1978):
- Calyx obconical, with marked bilateral symmetry through midline of A radial and CD interray; thecal walls thin and weak, sustained by ray and anal plates plicated in strong externally rounded ridges; infrabasals five, projecting more or less beyond column; basals large; several secundibrachs incorporated in calyx; interprimibrachs depressed, small numerous, and irregular; CD interray with sagittal uniserial row of very prominent anal plates separating two depressed fields of very diminutive plates. Tegmen low, slightly convex, pliant, composed of minute irregular pieces forming a continuation of interbrachials; no anal tube. Arms uniserial. Stem pentagonal or round in cross section.
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Gaurocrinus
