Lichenocrinus crateriformis

Classification
Phylum: Echinodermata
Class: Crinoidea
Holdfast
Genus: Lichenocrinus
Species: Lichenocrinus crateriformis (Hall, 1866)

L.craterifromis_paleoeco

Stratigraphic Occurrences

L.crateriformis_strat

Geographic Occurrences

Map point data provided by iDigBio.

Stratigraphic Description

Sequences (Formations)

  • C5 (Waynesville)

Identification in Hand Sample

  • Crater plates polygonal, irregular in size.
  • Pentagonal column occupies about one-third the crater area
  • Body plates are flat or slightly convex, pentagonal and hexagonal, nearly uniform in size and arranged in alternating series

Lichenocrinus crateriformis from the Southgate Formation of Cincinnati, Ohio (CMC 3284)

Published Description

Faber (1929):

  • Basal body small, depressed convex with a comparatively large crater; crater plates polygonal, somewhat irregular in size and arranged in one or two series. The small pentagonal column occupies about one-third the crater area. The body plates are flat or slightly convex, pentagonal and hexagonal, nearly uniform in size and arranged in alternating series; 2 to 3 plates can be counted along a radius from the crater to the margin. A few small plates are seen at the margin.

Cumings (1908):

  • “Body small, distinctly subpentagonal, subdiscoid, with an elevated margin and strongly depressed center; composed of medium-sized polygonal plates. Proboscis minute, central. This species differs from the preceding [L. dyeri] in its more elevated margin, and in the absence of the five prominences of the disc; the proboscis is much smaller in proportion to the size of the body, and the whole is composed of a smaller number of larger sized plates.”-Hall, loc. cit.

Meek (1873):

  • Body discoid, with a sub-pentagonal or nearly circular outline; elevated and rounded near the margin, and broadly and distinctly concave in the middle; composed of alternating ranges of moderate sized, generally hexagonal smooth plates as wide as long, around the convex outer part, and of much smaller pieces within the central concavity, that diminish in size inward to the base of the central appendage; internal rays slender, about one hundred, only a few of which quite reach the central point, the others ending at different and somewhat regularly arranged distances in from the periphery. Column-like appendage very long, slender, and tapering very gradually through its whole length, so as to end in an extremely slender mucronate point at the free extremity; more or less distinctly pentagonal, and composed of about five equal ranges of small, regularly and alternately arranged, interlocking pieces; but gradually becoming more rounded, with the pieces nearly or quite opposite, farther from the body: perforation small and pentagonal.
  • Diameter of the largest specimen seen, 0.35 inch, with a concavity of 0.08 inch. Diameter of another individual with a portion of the column attached, 0.15 inch; height of do., 0.05 inch; thickness of column-like appendage, near body, 0.04 inch; length of same to the broken free end, nearly three inches, with a diameter at same of 0.02 inch.