Lethenia

Lethenia Temporal range: Late Eocene–Early Oligocene PreꞒ Ꞓ O S D C P T J K Pg N
Holotype of Lethenia carranzaensis
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Chondrichthyes
Subclass:	Elasmobranchii
Division:	Selachii
Order:	Lamniformes
Family:	Lamnidae
Genus:	† Lethenia Baut & Génault, 1999
Species
L. carranzaensis Otero, 2025 L. vanderbroecki Baut & Génault, 1999 (Type)

Lethenia is an extinct genus of mackerel shark from the Eocene and Oligocene epochs. ^[1] It contains two species; the type species L. vanderbroecki is from the early Oligocene (Rupelian age) of Belgium, ^{[2] [3]} while L. carranzaensis is from the late Eocene to early Oligocene of Chile. ^[1] It is considered closely related to Isurolamna and sometimes included within it. It differs in the morphology of its teeth, which are much more gracile than Isurolamna and has larger spacing between its crown and lateral cusps. ^[3]

References

1. Otero, R. A. (2025). "New Paleogene records of cartilaginous fishes (Chondrichthyes) from central Chile, including the oldest lamnid diversity from the southeastern Pacific". PeerJ. 13 e19996. doi: 10.7717/peerj.19996 .
2. BAUT, J.-P. & GENAULT, B. (1999) Les Elasmobranches des Sables de Kerniel (Rupélien), à Gellik, Nord Est de la Belgique, Memoirs of the Geological Survey of Belgium, 45: 1–61
3. Henri, Cappetta. (2012). Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. Handbook of Paleoichthyology. 3.