Centroceratidae

The Centroceratidae is the basic, central family of the Trigoncerataceae from which the other four families are directly or indirectly derived; gave rise to the Grypoceratidae and Trigonoceratidae early in the Mississippian. The origin of the Centroceratidae is uncertain, but may be in either the Rutoceratidae or Tetragonoceratidae.

Shells are variously coiled, gyroconic, evolute, or involute. Whorl sections are commonly quadrangular with sides converging from the wider dorsum on the inner curvature to the narrower venter on the outer curvature. Siphuncles are tubular, close to but not in contact with the venter.

Genera assigned to the Centroceratidae include Centroceras, Strophioceras, Phacoceras, and Homaloceras.