Ancistrus megacanthus, new species and redescription of Ancistrus brevipinnis

[bekateen]

Ancistrus megacanthus

, new species

Widholzer RL, Borsoi J, Reis RE, Lehmann A. P. 2023. A new species of Ancistrus (Siluriformes: Loricariidae), with a redescription of

Ancistrus brevipinnis

and further evidence of hidden diversity in the laguna dos Patos system, Brazil. Neotrop. Ichthyol., 21(4):e230078. https://doi.org/10.1590/1982-0224-2023-0078

https://www.scielo.br/j/ni/a/9Yxq6w7Xvj ... j/?lang=en
https://doi.org/10.1590/1982-0224-2023-0078

Abstract
A new species of

Ancistrus

is described from the rio Vacacaí drainage, rio Jacuí basin, laguna dos Patos system, southern Brazil. The new species differs from A. brevipinnis, the common species in the laguna dos Patos system, by having a dark brown to black background body color and dorsal and caudal fins plain dark, without lighter spots or bands. A morphometric and molecular comparison of different populations of A. brevipinnis from the laguna dos Patos system suggests that previously undetected species diversity is present in that basin. The type-locality of A. brevipinnis, originally described as Rio Grande do Sul State, is herein restricted to the rio Camaquã sub-basin of the laguna dos Patos system, and a redescription of A. brevipinnis is provided based on that population.

Keywords:
Biodiversity; Fish; Morphometrics; Systematics; Taxonomy