Pseudohaploceras

Pseudohaploceras; Temporal range: Early Cretaceous; ~145–109 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Cephalopoda
Order:	Ammonitida
Family:	Desmoceratidae
Subfamily:	Pizosiinae
Genus:	Pseudohaploceras; Hyatt, 1900
Species
	P. liptoviense; P. matheroni; P. portaeferreae; P. reesidei; P. tachthaliae;

Pseudohaploceras is a genus of desmosceratid ammonites from the Early Cretaceous; Valanginian to Albian epochs. The genus is distinguished by its moderately involute, slightly to moderately compressed shell with convex sides and regular straight or sinuous constrictions between which are fairly fine, distinct, sharp or rounded branching ribs extending from the umbilical edge and crossing the venter, the outer rim.

Pseudohaploceras is considered an offshoot of early Valdedorsella, which differ in having a more broadly rounded whorl section and generally straight radial constrictions. It is included in the subfamily Pizosiinae.

Distribution

Fossils of Pseudohaploceras have been found in Austria, China, Colombia (Tibasosa Formation, Santa Rosa de Viterbo and Yuruma and Apón Formations, La Guajira), Egypt, Italy, Japan, Mexico, Serbia and Montenegro, Spain, Tanzania, and the former USSR.[1]

gollark: They are part of the weekend. They occur at the end of the week. After the end of the week, it is a new week, and also Monday.

gollark: I think it's conventionally Monday here. Sunday would be silly.

gollark: I think in a thousand years you might struggle to find working playback hardware, but oh well.

gollark: Fancier blu-ray discs which allegedly last a thousand years.

gollark: > implying OOP good

References

Pseudohaploceras at Fossilworks.org

Pseudohaploceras

Distribution

References

Further reading