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A new species of rockling fish genus Gaidropsarus is described based on six specimens collected in Galicia and Porcupine Banks, in Atlantic European waters. An analysis of morphological characters has confirmed the specific status of specimens of a previously described clade by comparison of DNA sequences. Gaidropsarus gallaeciae sp. nov. it is distinguished from congeners by the following combination of characters: 43-44 vertebrae; 54-60 third dorsal fin rays; 44-52 anal fin rays; 21-23 pectoral fin rays; head length 21.1-25.2% of standard length (SL); length of the pelvic fin 16.2-19% SL; length of the first dorsal fin ray 15.8-27% of head length (%HL); eye diameter 15.8-20.5% HL; and interorbital space 21.7-28% HL. Using the nucleotide sequence of the 5' end of the mitochondrial COI gene as a molecular marker, the genetic p-distance between the new species and its congeners far exceeds the usual 2%, granting the former the status of an independent taxon, which is in accordance with the morphological identification. A comparison with the other 12 valid species of the genus is presented. The study also highlights the morphological diversity resulting from the meristic and biometric variability of Gaidropsarus species and lays the groundwork for future taxonomic studies on this genus.

Gaidropsarus gallaeciae (Gadiformes: Gaidropsaridae), a New Northeast Atlantic Rockling Fish, with Commentary on the Taxonomy of the Genus