Holcodiscidae

Holcodiscidae is an ammonite family placed in the superfamily Desmoceratoidea.

Description
Moderately involute with rounded, rectangular, or depressed whorl section; straight or sinuous, fine, dense ribs typically continuing over venter and may be periodically truncated by oblique, enlarged ribs, with or without umbilical, lateral and ventrolateral tubercles. Suture rather simple.

Genera

 * Astieridiscus
 * Holcodiscus
 * Jeanthieuloyites
 * Parasaynoceras
 * Spitidiscus

Distribution
Fossils of species within this family have been found in the Cretaceous sediments in Argentina, Austria, Bulgaria, Chile, Colombia, the Czech Republic, Czechoslovakia, France, Hungary, Italy, Mexico, Morocco, Portugal, Romania, Slovakia, Spain and Russia.