C corrugatus 250px

Phylum: Mollusca
Class: Tentaculita
Order: Cornulitida (Boucek, 1964)
Cincinnatian Family: Cornulitidae

Geologic Range
Ordovician – ?Mississippian

Common Paleoecology
Cornulitida is an extinct order of stationary epifaunal suspension feeders.

Characteristics of the Order

  • Calcium carbonate tubes, can have circular cross section.
  • Rod-like tapering of cone shape.
  • Walls enclose central, usually circular, cavities.
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Treatise on Invertebrate Paleontology, Part W, Vol. 1 (1962) (Description of the family, Cornulitidae):

  • Flexuous, ringed, small to medium-sized tapering tubes of calcium carbonate, with circular cross section; rings dominant in specific stages of growth and longitudinal striae dominant in other stages. Relatively thick walls composed of large, rounded or oval cellular cavities, cells with thin walls and especially conspicuous in transverse rings which are narrower and closer together toward apex. Mold of internal cavity consists of rodlike tapering body of invaginated cones with apices directed toward aperture and is thus homeomorphic with internal molds of Tentaculitidae. Length 5 to 80 mm.

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