Reganella depressa and Hemiodontichthys acipenserinus?

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Reganella depressa

and

Hemiodontichthys acipenserinus

? It never occurred to me how similar they are. How do you tell these two species apart (other than maybe catch location). Is it the bulbous nose of Hemiodontichthys? Is it mouth parts?

Thanks, Eric

Reganella depressa

Hemiodontichthys acipenserinus

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There's this:
Isbrücker, I. J. H., & Nijssen, H. (1974). On Hemiodontichthys acipenserinus and Reganella depressa, two remarkable mailed catfishes from South America (Pisces, Siluriformes, Loricariidae). Beaufortia, 22(294), 193-222.
https://repository.naturalis.nl/pub/505 ... 294001.pdf

Hemiodontichthys acipenserinus

(Kner, 1854) is redescribed and figured after examination of 132 specimens from the Rio Amazonas, Essequibo River, and Rio Paraguai systems, including five syntypes, from which the lectotype is selected.

Reganella depressa

(Kner, 1854) is redescribed and figured after examination of 7 specimens from the Rio Amazonas system, including two syntypes, from which the lectotype is selected. Relationships of the monotypic genera Hemiodontichthys Bleeker, 1862, and Reganella Eigenmann, 1905 with other genera are briefly discussed.

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How short my own memory is...

See this article

The citation is:
Isbrücker, I. J. H., & Nijssen, H. (1974). On Hemiodontichthys acipenserinus and Reganella depressa, two remarkable mailed catfishes from South America (Pisces, Siluriformes, Loricariidae). Beaufortia, 22(294), 193-222.