Cranial anatomy of the predatory actinopterygian Brazilichthys macrognathus from the Permian (Cisuralian) Pedra de Fogo Formation, Parnaíba Basin, Brazil
| Autor: | Valéria Gallo, Matt Friedman, Rodrigo T. Figueroa |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
010506 paleontology biology Permian Cranial anatomy Parasphenoid Paleontology Anatomy Structural basin Acrolepis biology.organism_classification 010603 evolutionary biology 01 natural sciences Devonian Macrognathus Skull Taxon medicine.anatomical_structure Hyomandibula medicine Geology 0105 earth and related environmental sciences |
| DOI: | 10.1101/540310 |
| Popis: | Brazilichthys macrognathusis the only named actinopterygian from the Permain (Cisuralian) Pedra de Fogo Formation of northeastern Brazil, where it is represented by a single three-dimensionally preserved but incompletely described skull of unclear systematic placement. We used X-ray computed microtomography (μ-CT) to better document its anatomy and phylogenetic affinities. μ-CT reveals parts of the internal skeleton. We correct errors in original description, including the number of infraorbital bones and the misidentification of the dermosphenotic as sclerotic ossifications. These reinterpretations of external anatomy are joined by new data on internal structure, including the palate, parasphenoid, and branchial and hyoid arches. A maximum parsimony analysis of anatomical data resolvesBrazilichthysas a stem actinopterygian, crownward of all Devonian species. This placement is supported by the absence of a dermosphenotic posterior ramus and the presence of opercular process of the hyomandibula. A similar placement is suggested by a Bayesian analysis of this same dataset, although relationships throughout the tree are less resolved. Our results reject previous interpretations ofBrazilichthysas a relative of Birgeriidae, a Triassic group consistently placed within the actinopterygian crown. AlthoughAcrolepisis too poorly known to be included in our analysis, we also reject a close relationship between this taxon andBrazilichthys, as their only shared similarities appear to be broadly distributed among early actinopterygians. |
| Databáze: | OpenAIRE |
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