Clathrospira

Classification
Phylum: Mollusca
Class: Gastropoda
Order: Murchisoniina
Family: Eotomariidae
Genus: Clathrospira Ulrich and Scofield, 1897
Cincinnatian Species: Clathrospira conica,
Clathrospira subconica

Taxonomic Details

Formerly: Previousley Pleurotomaria(Hall 1847), now known as Clathrospira(Ulrich and Scofield, 1897)

Geologic Range
Mid-Ordovician – Silurian

Common Paleoecology
Clathospira is an extinct genus of facultatively mobile, epifaunal suspension feeders

Identification in Hand Sample:

  • Turbiniform
  • Moderatly spired
  • Prosocline growth lines
  • Sutures shallow
  • Growth lines lean toward the growth direction when above the selenizone and lean away from the direction of growth below it

Geographic Occurrences

Published Description

Rohr (1996):

  • The conical spire and the presence of a shallow slit and selenizone at the periphery are characteristic of Clathrospira,… the weak spiral threads are considered diagnostic by Ulrich and Scofield (1897) and Knight (in Knight et al., 1960) …

Fossils of Ohio (1996):

  • Shell moderately spired

Treatise on Invertebrate Paleontology, Part I, Vol. 1 (1960) :

  • Turbiniform with conical spire and shallow sutures, narrowly phaneromphalus; growth lines strongly prosocline above selenizone and strongly opisthocline below it, but rounding to gently proscline on base, outlining a moderately deep labral sinus that culminates in a short slit; selenizone bordered by fine threads; growth lines and lunulae periodically strengthened, very fine spiral threads numerous.

Ulrich & Scofield (1897):

  • Shell in all respects like Eotomaria except that the band is nearly vertical and situated upon the periphery of the whorls, and the surface beautifully cancellated.

C. conica


C. subconica