Anatomical, taxonomic, and phylogenetic reappraisal of a poorly known ghost knifefish, Tembeassu marauna (Ostariophysi: Gymnotiformes), using X-ray microcomputed tomography


Autoři: Luiz A. W. Peixoto aff001;  Aléssio Datovo aff001;  Ricardo Campos-da-Paz aff002;  Carlos D. de Santana aff003;  Naércio A. Menezes aff001
Působiště autorů: Museu de Zoologia da Universidade de São Paulo, Seção de peixes, São Paulo, SP, Brazil aff001;  Universidade Federal do Estado do Rio de Janeiro, Centro de Ciências Biológicas e da Saúde, Instituto de Biociências, Rio de Janeiro, RJ, Brazil aff002;  National Museum of Natural History, Smithsonian Institution, Division of Fishes, Department of Vertebrate Zoology, Washington, DC, United States of America aff003
Vyšlo v časopise: PLoS ONE 14(11)
Kategorie: Research Article
doi: 10.1371/journal.pone.0225342

Souhrn

A detailed osteological study of the poorly known and critical endangered ghost knifefish, Tembeassu marauna, from the rio Paraná, Brazil, was conducted using X-ray microcomputed tomography (μCT scan). A redescription of the external anatomy was performed, including the unusual presence of a rostral patch of extra teeth on the region of the upper lip anterior to the premaxilla and the prominent anterior fleshy expansions in both upper and lower lips. The newly surveyed characters were included and analyzed in light of a recent morphological data matrix for Gymnotiformes. In spite of some uncertainties that remains as to phylogenetic allocation of the genus, the most probable hypothesis is that Tembeassu is the sister group of a clade that includes Megadontognathus and Apteronotus sensu stricto. The phylogenetic analysis also supports that Tembeassu is considered a valid genus of Apteronotidae. An amended diagnosis for the genus is also provided.

Klíčová slova:

Computed axial tomography – Dentition – Jaw – Ossification – Osteology – Phylogenetic analysis – Teeth – Vertebrae


Zdroje

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2019 Číslo 11