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| Pogonias courbina (Lacepède, 1803)
in Azpelicueta, Delpiani, Cione, et al., 2019.
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Abstract
The family Sciaenidae comprises about 300 species. The black drum Pogonias cromis was the only valid species of the genus. Herein, Pogonias courbina Lacepède 1803 is redescribed based on morphological and molecular evidence and a neotype is designated. Pogonias courbina is distinguished by the following characters: the occurrence of characteristic thickening of the dorsal spines VII to XI in all specimens larger than 250 mm SL; all pterygiophores in the dorsal-fin laminar, thin; anal-fin pterygiophores slender excluded those of spines; lateral projections of gas bladder with few finger-like projections; genetic distance between both species 1%; exclusive occurrence of characters in six informative sites of COI (58 G; 214 G; 328 A; 331 A; 553C; 580 G). The method Automatic Barcode gap Discovery detected gaps in nucleotid distance congruent with the NJ, MP, and ML tree analysis. Also, advertisement calls are three times shorter in duration in P. courbina than in P. cromis. In addition, two monophyletic groups for P. cromis and P. courbina appear in trees obtained with different methodologies, emphasizing the absence of shared haplotypes. A gap of about 8000 km occurs in the distribution of both species along coastal areas of the Atlantic Ocean.
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| Fig 1. Pogonias courbina. Neotype. Argentina, Provincia de Buenos Aires, San Clemente del Tuyú, 488 mm SL. Scale bar = 10 cm. |
Pogonias courbina (Lacepède, 1803)
Pogonathus courbina Lacepède 1803: 120.
Type locality: Rio de la Plata
Diagnosis: Pogonias courbina is distinguished from P. cromis by the characteristic hyperostoses in the spines of the central part of dorsal fin of all specimens over 250 mm SL (vs hyperostose absent); by having all pterygiophores in the dorsal fin always laminar and thin (vs dorsal-fin pteygiophores broad); pterygiophores of anal fin slender excluded those of the anal spines (vs anal.fin pterygiophores broad); gas bladder with lateral processes simple (vs anterior and lateral processes complex); advertisement call short,120–200 milliseconds (vs advertisement call long, 600±22 ms). Genetic distance between P. cromis and P. courbina 1%. A compound nucleotide diagnostic discriminates between P. cromis and P. courbina by the exclusive occurrence of characters in six informative sites of COI (58 G; 214 G; 328 A; 331 A; 553C; 580 G).
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María de las Mercedes Azpelicueta , Sergio Matías Delpiani, Alberto Luis Cione, Claudio Oliveira, Alexandre Pires Marceniuk and Juan Martín Díaz de Astarloa. 2019. Morphology and Molecular Evidence support the Validity of Pogonias courbina (Lacepède, 1803) (Teleostei: Sciaenidae), with A Redescription and Neotype Designation. PLoS ONE. 14(6): e0216280. DOI: 10.1371/journal.pone.0216280
