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Article: A new dercetid fish (Neoteleostei: Aulopiformes) from the Turonian of the Pelotas Basin, southern Brazil

Publication: Palaeontology
Volume: 49
Part: 2
Publication Date: March 2006
Page(s): 445 456
Author(s): Francisco J. de Figueiredo and Valéria Gallo
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How to Cite

DE FIGUEIREDO, F. J., GALLO, V. 2006. A new dercetid fish (Neoteleostei: Aulopiformes) from the Turonian of the Pelotas Basin, southern Brazil. Palaeontology49, 2, 445–456.

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Dercetid fishes are common in Tethyan marine deposits of Europe, Asia and Africa. In this paper, we describe a South American dercetid fish, Brazilodercetis longirostris gen. et sp. nov., based on juvenile and adult specimens found in core samples at c. 4000 m sediment depth in the Atlantida Formation (Pelotas Basin, southern Brazil). Brazilodercetis longirostris is a slender, elongate fish recognized on the basis of the following features: prominent snout; contact between mesethmoid and frontals very anterior to the orbit; mesethmoid separating the premaxillae for half of their length; juvenile specimens bearing wedge-like teeth on the anterior third of maxilla; long and shallow crest crossing epioccipital, parietal and posterior border of frontal; a pipe-like preopercle; and reduced neural spine at the middle point of neural arch. Brazilodercetis shares a number of features with the other dercetids, including a pointed snout that is longer than the lower jaw (with Rhynchodercetis and Hastichthys), a medioparietal skull roof (with Cyranichthys and Benthesikyme), an unroofed posttemporal fossa (with Dercetoides, Rhynchodercetis and Pelargorhynchus), a flange on the anguloarticular (with Dercetoides, Hastichthys, Rhynchodercetis and Cyranichthys), untoothed premaxillae (with Hastichthys and probably Rhynchodercetis), and a single row of teeth on the maxillae (with Dercetis, Benthesikyme, Rhynchodercetis, Pelargorhynchus, Dercetoides and Hastichthys).
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