A reappraisal of phylogenetic relationships among auchenipterid Centromochlinae catfishes

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Sarmento-Soares, L. M., & Martins-Pinheiro, R. F. (2020). A reappraisal of phylogenetic relationships among auchenipterid catfishes of the subfamily Centromochlinae and diagnosis of its genera (Teleostei: Siluriformes). Proceedings of the Academy of Natural Sciences of Philadelphia, 167(1), 85-146. https://doi.org/10.1635/053.167.0108

https://bioone.org/journals/proceedings ... 0108.short

Abstract
A hypothesis of phylogenetic relationships is presented for species of the South American catfish subfamily Centromochlinae (Auchenipteridae) based on parsimony analysis of 133 morphological characters in 47 potential ingroup taxa and one outgroup taxon. Of the 48 species previously considered valid in the subfamily, only one,

Centromochlus steindachneri

, was not evaluated in the present study. The phylogenetic analysis generated two most parsimonious trees, each with 202 steps, that support the monophyly of Centromochlinae composed of five valid genera:

Glanidium

,

Gephyromochlus

,

Gelanoglanis

,

Centromochlus

and

Tatia

. Although those five genera form a clade sister to the monotypic

Pseudotatia

, we exclude Pseudotatia from Centromochlinae. The parsimony analysis placed Glanidium (six species) as the sister group to all other species of Centromochlinae. Gephyromochlus contained a single species,

Gephyromochlus leopardus

, that is sister to the clade Gelanoglanis (five species) + Centromochlus (eight species). Based on the new taxonomic arrangement herein,

Balroglanis

Grant 2015 and

Sauronglanis

Grant 2015 are placed in the synonymy of Centromochlus. Tatia is the most diverse genus within Centromochlinae, with twenty-six species in three monophyletic clades. The species composition of Tatia differs from that of Calegari et al. (2019).

Duringlanis

Grant 2015 and

Ferrarissoaresia

Grant 2015 are considered synonyms of Tatia. All generic taxa within Centromochlinae are diagnosed based on synapomorphic morphological characters. An identification key for Centromochlinae is provided.

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From the paper:

KEY TO GENERA OF CENTROMOCHLINAE

• 1. Large sinuous mouth, extending past vertical through eye; opening for posterior nare large, olfactory rosette well developed; eye small, diameter less than 4% HL; one pair of chin barbels .......
  Gelanoglanis
  • 1’. Short straight mouth, not reaching vertical through eye; opening for posterior nare small, olfactory rosette normally developed; eye medium to large, diamter greater than 6% HL; two pairs of chin barbels .......2
• 2. Latero-posterior margin of sphenotic distinctly concave (Figs. 9A,B); 8 to 11 (rarely 7) branched anal-fin rays; male modified anal fin with 20 to 43 segments along third unbranched ray .......3
  • 2’. Latero-posterior margin of sphenotic straight to slightly concave (Fig. 9C,D); 5 to 7 (rarely branched anal-fin rays; male modified anal fin with 6 to 15 segments along third unbranched ray .......4
• 3. Anterior margin of pectoral spine rugose or with very small serrations, tip of spine pungent (Fig. 18C, 19E); 10 or 11 branched anal-fin rays .......
  Gephyromochlus
  • 3’. Anterior margin of pectoral spine with well-formed serrations, tip of spine bifurcate (Fig. 18A, 19F); 8 or 9 branched anal-fin rays .......
    Glanidium
• 4. Mesethmoid short (compact), maximum width up to two times medial length; posterior nuchal plate reduced and curved (Fig. 8C); eye diameter less than 25% HL; three unbranched rays on male modified anal fin (Fig. 20B); color pattern spotted or reticulated .......
  Tatia
  • 4’. Mesethmoid generally longer, maximum width less than 1.5 times medial length; posterior nuchal plate large and straight (Fig. 8A); eye diameter ≥25% HL; two unbranched rays on male modified anal fin (Fig. 20A); color greyish with wavy pattern or contrasting colors .......
    Centromochlus

[Jools]

Will get onto the changes in here soon...

Jools

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Will get onto the changes in here soon...

I wouldn't recommend moving anything yet. Let's wait to see if it "bakes in" as they say.

Cheers, Eric