Tribodus limae is the first hybodont from the Early Cretaceous of Chapada do Araripe (North-East Brazil).
Description[]
The braincase of an additional Lower Cretaceous hybodont, Egertonodus basanus, is also digitally reconstructed and compared to Tribodus. A reconstruction of cranial nerves and blood vessels in Tribodus is presented on the basis of preserved foramina. The braincase of Tribodus shares many features with those of Egertonodus and neoselachians, providing further support for the sister-group relationship between hybodonts and extant elasmobranchs.
Hybodont fish Tribodus limae, from the Lower Cretaceous of northeastern Brazil, provides new information on the pectoral endoskeleton in this taxon. This allows for a revision of its pectoral morphology, which may be broadly applicable to other Hybodontoidei. Four new specimens of Tribodus with well-preserved pectoral girdles are described, including the first complete, three-dimensionally preserved hybodont scapulocoracoid and partial pectoral fin. These specimens permit examination of the posterior surface of the scapulocor-acoid, not visible in previously described hybodonts.
References[]
- https://shark-references.com/species/view/Tribodus-limae
- https://bioone.org/journals/American-Museum-Novitates/volume-39/issue-1/681.1/Morphology-of-the-Braincase-in-the-Cretaceous-Hybodont-Shark-Tribodus/10.1206/681.1.short
- https://www.mindat.org/taxon-4824440.html
- https://www.tandfonline.com/doi/abs/10.1080/02724634.2009.10010359
- https://www.researchgate.net/publication/232678700_Morphology_of_the_Braincase_in_the_Cretaceous_Hybodont_Shark_Tribodus_limae_Chondrichthyes_Elasmobranchii_Based_on_CT_Scanning
- https://bioone.org/journals/American-Museum-Novitates/volume-39/issue-1/681.1/Morphology-of-the-Braincase-in-the-Cretaceous-Hybodont-Shark-Tribodus/10.1206/681.1.short