Article Dans Une Revue (Article De Synthèse) Geological Magazine Année : 2026

A new genus of lonchidiid hybodontiform sharks from the Cretaceous of North Africa and South America

Résumé

Minute hybodont shark teeth from uppermost Albian–lower Cenomanian (mid-Cretaceous) continental deposits of Djebel Amour (Saharan Atlas, Algeria) are described. They are assigned to a new genus and species of Lonchidiidae, Lonchidionoides trifurcatum . Similar teeth recently reported from the Early Cretaceous of Brazil are here referred to as Lonchidionoides sp. The heterodont dentition of Lonchidionoides is characterized by clutching anterior teeth with a tricuspid crown and larger crushing posterior teeth with less individualized cusps. Lateral teeth show an intermediate morphology. The two occurrences of this non-marine hybodontiform genus may reflect the existence of a large ancestral distribution area that was divided during the opening of the South Atlantic, as previously suggested for several groups of cartilaginous and bony fishes.

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insu-05476138 , version 1 (26-01-2026)

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Romain Vullo, Léo Galvão Carnier Fragoso, Jonathas S Bittencourt, Adán Pérez-García, Imad Bouchemla, et al.. A new genus of lonchidiid hybodontiform sharks from the Cretaceous of North Africa and South America. Geological Magazine, 2026, 163, pp.e6. ⟨10.1017/S0016756825100484⟩. ⟨insu-05476138⟩
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