Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

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Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

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Rhyacoglanis rapp-pydanielae , new species

Oscar A. Shibatta, O.A., Rocha, M.S., & R.R. de Oliveira. (2021). New species of Rhyacoglanis (Siluriformes: Pseudopimelodidae) from rio Tocantins basin, northern Brazil. Neotrop. ichthyol., 19(04).

https://doi.org/10.1590/1982-0224-2021-0083
https://www.scielo.br/j/ni/a/HJYgMDJ4nD4WHF8vgzKJmRt/
Abstract
A new species of Rhyacoglanis is described from the rapids of Jatobal, Pará State, Brazil. This species differs from the congeners by fusing hypurals 3, 4, and 5 (vs. hypural 5 free). It also differs from the other species, except for Rhyacoglanis epiblepsis, by the color pattern with numerous dark spots on the body, short post-cleithral process, rounded pectoral and caudal fins, and incomplete lateral line. This species is known only from the type locality, which is currently flooded by the Tucuruí reservoir.
  • Keywords: Biodiversity; Bumblebee catfish; Ostariophysi; Systematics; Taxonomy
Resumo
Uma nova espécie de Rhyacoglanis é descrita das corredeiras de Jatobal, estado do Pará, Brasil. Essa espécie difere das congêneres pela fusão dos hipurais 3, 4 e 5 (vs. hipural 5 livre). Também difere das demais espécies, exceto de Rhyacoglanis epiblepsis, pelo padrão de colorido com inúmeras pintas escuras no corpo, processo pós-cleitral curto, nadadeiras peitoral e caudal arredondadas, e linha lateral incompleta. Essa espécie é conhecida apenas da localidade tipo, que atualmente se encontra inundada pelo reservatório de Tucuruí.
  • Palavras-chave: Bagrinho; Biodiversidade; Ostariophysi; Sistemática; Taxonomia
Diagnosis.Rhyacoglanis rapp-pydanielae is diagnosed from congeners by presenting the hypural bones 3, 4, and 5 fused (vs. hypural 5 free; Fig. 5). The new species also differs from its congeners, except for Rhyacoglanis epiblepsis, by the short post-cleithral process, with only a tiny visible tip after the opercular membrane (vs. elongated, more than half length visible after opercular membrane; Fig. 2), body scattered with numerous dark brown spots of diameter approximately equal to that of the eye (vs. few dark brown spots or absent), rounded pectoral and caudal fins (vs. pointed fins), and incomplete long lateral line (vs. complete). Rhyacoglanis rapp-pydanielae is distinguished from R. epiblepsis by the more tapered shape of the caudal peduncle’s dark brown band and the thin caudal fin’s dark brown band.
Attachments
FIGURE 1 Rhyacoglanis rapp-pydanielae, holotype, INPA 8060, 37.5 mm SL, rio Tocantins, state of Pará, Brazil.
FIGURE 1 Rhyacoglanis rapp-pydanielae, holotype, INPA 8060, 37.5 mm SL, rio Tocantins, state of Pará, Brazil.
FIGURE 2 Posterior cleithral process (red arrows) of A. Rhyacoglanis rapp-pydanielae, holotype, INPA 8060, 37.5 mm SL, and B. Rhyacoglanis seminiger, holotype, LIRP 12466, 74.2 mm SL.
FIGURE 2 Posterior cleithral process (red arrows) of A. Rhyacoglanis rapp-pydanielae, holotype, INPA 8060, 37.5 mm SL, and B. Rhyacoglanis seminiger, holotype, LIRP 12466, 74.2 mm SL.
FIGURE 3 Pectoral-fin spine: A. Left, ventral view of Rhyacoglanis rapp-pydanielae, paratype, INPA 7957, 33.3 mm SL, rio Tocantins, state of Pará, Brazil, scale bar = 1 mm; and B. Right, dorsal view of Rhyacoglanis seminiger, holotype, LIRP 12466, 74.2 mm SL, scale bar = 2.0 mm (after Shibatta, Vari, 2017).
FIGURE 3 Pectoral-fin spine: A. Left, ventral view of Rhyacoglanis rapp-pydanielae, paratype, INPA 7957, 33.3 mm SL, rio Tocantins, state of Pará, Brazil, scale bar = 1 mm; and B. Right, dorsal view of Rhyacoglanis seminiger, holotype, LIRP 12466, 74.2 mm SL, scale bar = 2.0 mm (after Shibatta, Vari, 2017).
FIGURE 5 Caudal-fin skeleton of Rhyacoglanis rapp-pydanielae, paratype, INPA 7957, 33.3 mm SL, rio Tocantins, state of Pará, Brazil. H1–5 = hypurals 1 to 5. Scale bar = 1 mm.
FIGURE 5 Caudal-fin skeleton of Rhyacoglanis rapp-pydanielae, paratype, INPA 7957, 33.3 mm SL, rio Tocantins, state of Pará, Brazil. H1–5 = hypurals 1 to 5. Scale bar = 1 mm.
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Re: Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

Post by Silurus »

The Code says you can’t have hyphens in the specific epithet for this case. Article 32.5.2.3 states “In a compound species-group name published as words united by an apostrophe or a hyphen, the words are to be united by removing the mark concerned”.
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Re: Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

Post by bekateen »

I wondered about that. Not something I've ever seen before, but I didn't know the rule.

So does this mean we can expect the species to be renamed? Is there some rapid-acting mechanism to correct improperly formed names?

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Re: Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

Post by Silurus »

The Code already indicated the corrective action, which is to remove the hyphen. Such corrective actions are to be automatically applied without the need for a publication explicitly stating so.
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Re: Rhyacoglanis rapp-pydanielae, new species from rio Tocantins basin

Post by bekateen »

Okay thank you.
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