Cyrtogomphoceratidae

Systematic Paleontology

Phylum Mollusca

Class Cephalopoda

Subclass Nautiloidea

Order Discosorida

Family Cyrtogomphoceratidae

The Cyrtogomphoceratidae is a family of discosorid nautiloid cephalopods from the middle and upper Ordovician, characterized by generally short (breviconic) shells with an endogastric curvature such that the ventral (or lower) side is concave in longitudinal profile. Body chambers are generally contracted, narrow toward the aperture. Chambers are short, sutures close spaced; siphuncles ventral.

The Cyrtogomphoceratidae has its derivation in the Reudemannoceratidae and is the source for the Phragmoceratidae of the Silurian.

Genera
Genera within the Cyrtogomphoceratidae include: Cyrtogomphoceras,

Kiaeroceras,

Konglungenoceras,

Landeroceras,

Parryoceras,

Strandoceras,

Ulrichoceras.