Lethenia

Lethenia is an extinct genus of mackerel shark from the Rupelian age of the Oligocene epoch.[1] It is a monotypic genus, containing only L. vandenbroeki.[2] 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. Lethenia is rare and only known from isolated teeth. It is best known from the Boom Clay Formation of Belgium and the Uzunbas Formation of Kazakhstan.[3][4]

Lethenia
Temporal range: Early Oligocene
Lethenia vandenbroeki from the Early Oligocene of Belgium
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Order: Lamniformes
Family: Lamnidae
Genus: †Lethenia
Baut & Génault, 1999
Species
  • Lethenia vandenbroeki

References
  1. Henri, Cappetta. (2012). Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth. Handbook of Paleoichthyology. 3.
  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. "elasmo.com". www.elasmo.com. Retrieved 2020-09-01.
  4. "www.somniosus.be". somniosus.be. Retrieved 2020-09-01.


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