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

Published Descriptions

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 dimunitive 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.

Gaurocrinus