Description of a new aspidorhynchid fish, Belonostomus lamarquensis sp. nov. (Halecostomi, Aspidorhynchiformes), from the continental Upper Cretaceous of Patagonia, Argentina
Bogan, S.; Taverne, L.; Agnolin, F.L. (2011). Description of a new aspidorhynchid fish, Belonostomus lamarquensis sp. nov. (Halecostomi, Aspidorhynchiformes), from the continental Upper Cretaceous of Patagonia, Argentina. Bull. Kon. Belg. Inst. Natuurwet. Aardwet. = Bull. - Inst. r. sci. nat. Belg., Sci. Terre 81: 235-245
In: Bulletin van het Koninklijk Belgisch Instituut voor Natuurwetenschappen. Aardwetenschappen = Bulletin de l'Institut Royal des Sciences Naturelles de Belgique. Sciences de la Terre. KBIN: Brussel. ISSN 0374-6291, meer
Some braincases, a predentary, a few vertebrae and scales of a new aspidorhynchid species, Belonostomus lamarquensis sp. nov., are described from the Upper Cretaceous (Campanian-Maastrichtian) Allen Formation of Patagonia, Argentina. The new species differs from the other Belonostomus species by its flank scales having an anterior smooth region separated by a vertical groove from a posterior region bearing a series of numerous and closely spaced subparallel ridges that end in a deeply crenulated posterior margin. The dermal bones are ornamented with ridges and tubercles, a rare character in Belonostomus. The endocranial bones are completely fused together, except the basisphenoid. Within the Belonostomus species, B. lamarquensis seems closely related to B. hooleyi from the English Lower Cretaceous, which also exhibits dermal bones with ridges and tubercles, and scales morphologically somewhat similar to those of B. lamarquensis.
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