A new species of the genus Squalius (Leuciscidae, Actinopterygii) from the Sado basin in Portugal

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Resumen

A new species, Squalius caetobrigus sp. nov. is described on the basis of morphological and genetic traits. Squalius caetobrigus sp. nov. can be distinguished from other Squalius species through a combination of morphometric, meristic and genetic characters: 39-42 (=40.7; =41) canaliculate scales on the lateral line; 6-7 (=7; =7) scales above the lateral line; 3-4 (=3.1; =3) scales below the lateral line; preorbital distance short HL/PrOL is 4.2-6.2 (= 5); fourth infraorbital bone without contact with preopercular; dentary short with very developed coronoid process; posterior process of the maxilla long and thin; the lower branch of the pharyngeal bone is long and thin; pharyngeal plate of the pharyngeal bone small and 5 autapomorphies in the mitochondrial cytochrome b gene. Squalius caetobrigus is restricted to the Sado drainage in southern Portugal.

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2025-06-06

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Research Paper