Hamulina

Hamulina is an extinct ammonoid cephalopod genus belonging to the family Hamulinidae.[1] These cephalopod were fast-moving nektonic carnivores. They lived during the Cretaceous period, Barremian age. The type species is Hamulina astieriana.

Hamulina
Temporal range: Cretaceous (Barremian),
Hamulina astieri
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Subclass: Ammonoidea
Order: Ammonitida
Suborder: Ancyloceratina
Family: Hamulinidae
Genus: Hamulina
d'Orbigny, 1850

Description

It may be large. The whorl section generally is increasing rapidly. The short final shaft is generally straight or curved. The main shaft is with dense, fine, prorsiradiate minor ribs and distant, periodic, weakly trituberculate major ribs. The minor ribs are weakened or disappearing on hook and final shaft. The major ribs are strengthened and approximating. The ammonitic suture is finely divided.

Distribution

Fossils of these cephalopods have been found in rocks of Cretaceous of Bulgaria, Colombia (Santa Rosa de Viterbo, Boyacá), Hungary, Italy, Mexico, Spain, Trinidad and Tobago.[2]

References

  1. Wright, C. W. with Callomon, J.H. and Howarth, M.K. (1996), Mollusca 4 Revised , Cretaceous Ammonoidea, vol. 4, in Treatise on Invertebrate Paleontology, Part L (Roger L. Kaesler ed.), Boulder, Colorado: The Geological Society of America & Lawrence, Kansas: University of Kansas Press, pp. 231, 232.
  2. "Hamulina". Fossilworks. Retrieved 2 May 2022.

Further reading


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