Teeth morphology and dental sexual dimorphism of three species of the sandskate genus Psammobatis Günther, 1870 from the Brazilian coast (Rajiformes, Arhynchobatidae)

Authors

  • Alvaro Brum-Neto Pontifícia Universidade Católica do Rio Grande do Sul https://orcid.org/0000-0003-1783-4485
  • Carlos Alberto Santos de Lucena Pontifícia Universidade Católica do Rio Grande do Sul

DOI:

https://doi.org/10.5007/2175-7925.2020.e70290

Abstract

Sets of jaws of the sandskates Psammobatis extenta (n = 10), P. lentiginosa (only adult specimens, n = 8) and P. rutrum (only adult specimens, n = 10) were examined by scanning electron microscopy. Female teeth of the three species and those of the immature P. extenta did not show differences, all having monocuspid crushing teeth, with a small, unpronounced or absent cusp. Monognathic heterodonty was observed in adult specimens in both sexes of the three species analyzed. Immature P. extenta and females of the three species differed from the adult males in having a crushing as opposed to a clutching dentition, implying gynandric heterodonty. Teeth of males of P. extenta have pointed, well-pronounced, rounded cusps, whereas males of P. rutrum and P. lentiginosa have elliptical and similar cusps. Immature specimens of P. extenta have small cusps. Teeth of P. lentiginosa have a longitudinal sulcus on their labial face, a character herein hypothesized as a derived condition.

Author Biographies

Alvaro Brum-Neto, Pontifícia Universidade Católica do Rio Grande do Sul

Possui graduação em Curso de Ciências Biológicas - Bacharelado pela Pontifícia Universidade Católica do Rio Grande do Sul (2012) e mestrado em Biociências (Zoologia) pela Pontifícia Universidade Católica do Rio Grande do Sul (2018). Tem experiência na área de Zoologia, com ênfase em Morfologia dos Grupos Recentes. Atuando principalmente nos seguintes temas:Filogenia, Arhynchobatini

Carlos Alberto Santos de Lucena, Pontifícia Universidade Católica do Rio Grande do Sul

Graduado em Licenciatura Plena em Ciências Biológicas pela Pontifícia Universidade Católica do Rio Grande do Sul em 1976. Obteve o título de Mestre em Biociências (Zoologia) em 1985 pela mesma Universidade e de Doutor em Ciências em 1993 pela Universidade de São Paulo (1993). Está no cargo de Curador II do Museu de Ciências e Tecnologia da Pontifícia Universidade Católica do Rio Grande do Sul. Em 2018 foi empossado Diretor do Museu de Ciências e Tecnologia da PUCRS. Tem experiência na área de Zoologia, com ênfase em Morfologia e Taxonomia dos Grupos Recentes. Atua principalmente com peixes neotropicais.

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2020-05-25

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Vol. 33 No. 2 (2020)

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