Acutalamna

Acutalamna is an extinct genus of mackerel shark from the Cretaceous period. It contains a singular species, A. karsteni. The type locality is the La Luna formation of Venezuela, but teeth have been found in France, Peru, Ecuador, and Lithuania. It is possible these teeth represent new species within this genus. Teeth included in this genus were originally attributed to "Priscusurus adruptodontus". The holotype and some of type series of this species were found to be indeterminate Squalicorax teeth, thus rendering it a nomen dubium. Other teeth in the type series of "P. adruptodontus" are indeterminate members of Acutalamna. It bears resemblance to both Anacoracids and Cretoxyrhinids, but has yet to be confidently ascribed to any family.^[1][2]

Acutalamna Temporal range: Albian –Cenomanian PreꞒ Ꞓ O S D C P T J K Pg N
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Order:	Lamniformes
Genus:	†Acutalamna Guinot & Carrillo-Briceño, 2018

References

1. Guinot, Guillaume; Carrillo-Briceño, Jorge D. (February 2018). "Lamniform sharks from the Cenomanian (Upper Cretaceous) of Venezuela". Cretaceous Research. 82: 1–20. Bibcode:2018CrRes..82....1G. doi:10.1016/j.cretres.2017.09.021. ISSN 0195-6671. S2CID 135126387.
2. Kriwet, Jürgen (2006-09-11). "Biology and dental morphology of Priscusurus adruptodontus, gen. et sp. nov. (Chondrichthyes, Lamniformes) from the Albian (Early Cretaceous) of Peru". Journal of Vertebrate Paleontology. 26 (3): 538–543. doi:10.1671/0272-4634(2006)26[538:BADMOP]2.0.CO;2. ISSN 0272-4634. S2CID 86302119.