Mastiglanis phylogeography

For the discussion of catfish systematics. Post here to draw our attention to new publications or to discuss existing works.
Post Reply
User avatar
Posts: 12252
Joined: Tue Dec 31, 2002 11:35 am
My articles: 55
My images: 871
My catfish: 1
My cats species list: 90 (i:0, k:0)
Spotted: 410
Location 1: Singapore
Location 2: Moderator Emeritus

Mastiglanis phylogeography

Post by Silurus »

Gales, SM, JS Ready, MH Sabaj, MJ Bernt, DJF Silva, C Oliveira, G Oliveira & JBL Sales, 2021. Molecular diversity and historical phylogeography of the widespread genus Mastiglanis (Siluriformes: Heptapteridae) based on palaeogeographical events in South America. Biological Journal of the Linnean Society, blab150, doi: 10.1093/biolinnean/blab150.


The catfish family Heptapteridae, endemic in the Neotropical region, is composed of small- to medium-sized species. The genus Mastiglanis was monotypic until very recently and is often misidentified as Imparfinis because of similarities in diagnostic characters, including the length of maxillary barbels and limited pigmentation. We provide the first molecular inference of diversity for samples identified as Mastiglanis. Partial 16S and COI sequences were produced for 84 samples identified morphologically as Mastiglanis from the Amazon, Orinoco and Essequibo river basins. Species delimitation and phylogenetic methods recovered the genus as monophyletic, but samples assigned to the species Mastiglanis asopos yielded 21 distinct operational taxonomic units, often in sympatry. The first cladogenesis event, at ~12 Mya, was associated with marine incursions and/or vicariance events between the northward-flowing systems in the west and the rivers that drain to the east. Subsequent diversification during the Miocene and Pliocene was inferred to have resulted from environmental changes associated with Andean orogeny, whereas recent diversification in the late Pliocene and Pleistocene was inferred to result from environmental changes during glacial cycles. Despite the many probable cryptic species found across the large geographical distribution of the genus, further sampling is expected to increase taxonomic richness in this genus.
Post Reply