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Ian Fuller (1) Chris Ralph (3) Allan James (3) Hans-Georg Evers (1) Graham Ramsay (3) Joakim Schön (1)

Corydoras diphyes (now Hoplisoma diphyes) belongs to the family Callichthyidae or Armoured Catfishes from South America; namely Paraguay, and is documented as being restricted to the tributaries of the Río Monday, Río Acaray, the right bank tributaries of the Río Paraná and a small stream at Estancia María Balén. It is also documented as being found in Brazil. It is a recently described species of Corydoras (2003). In its natural habitat Hoplisoma diphyes usually occurs in areas which have sandy substrates with bank vegetation entering the water. The water in which they are found varies from dark (stained with tannins) to clear or slightly turbid. This particular catfish is documented as being mimicked by Otocinclus mimulus. Lineage: Placed in Lineage 6. This group was always classified under Corydoras so when a new revision is carried out a new genus would have to be described alongside a new type species. As of the latest revision (Dias et al 2024) Corydoras diphyes has now been placed in Lineage 9 and has the new genus name of Hoplisoma. Aquarium Care: This is akin to most of this genus, very peaceful, and would be best housed with small to medium sized tankmates such as Tetras, Rasboras and Danios or in a species tank for breeding purposes. Best to purchase 6 individuals or more as they will be happier in a group. Diet: Readily accepts a mixed and varied diet which includes granular foods, tablet food, frozen bloodworm and a good quality flake. Etymology: The specific name diphyes: From the Greek word meaning double nature which refers to the unique colour patterns observed in this species – spotted and striped. Remarks: This species is still found on some online sources as Corydoras diphyes.

None

Corydoras diphyes

Callichthyidae

South America: Monday River and Acaray River, Paraná River basin, Paraguay. Type locality: Paraguay: Departamento Caaquazú: río Paraná drainage, small sream (arroyo) at Estancia María Belén, 8 km from Colonel Patricio Colman, 25º40'13"S, 55º5'52"W.

Male: 4.5cm (1¾ins) Female: 5.0cm (2ins)

23-26°C (73-79°F)

6.0-7.2.

Alexandrou, Markos & Taylor, Martin. (2011). Evolution, ecology and taxonomy of the Corydoradinae revisited.
Angelica C Dias, Luiz F C Tencatt, Fabio F Roxo, Gabriel de Souza da Costa Silva, Sérgio A Santos, Marcelo R Britto, Martin I Taylor, Claudio Oliveira, Phylogenomic analyses in the complex Neotropical subfamily Corydoradinae (Siluriformes: Callichthyidae) with a new classification based on morphological and molecular data, Zoological Journal of the Linnean Society, 2024;, zlae053.
Ferraris, C.J. Jr., 2007. Checklist of catfishes, recent and fossil (Osteichthyes: Siluriformes), and catalogue of siluriform primary types. Zootaxa 1418:1-628.
Ian A. M. Fuller & Hans-Georg Evers (2011). Identifying Corydoradinae Catfish Supplement 1. Ian Fuller Enterprises.
ScotCat Factsheet no. 142. April 2008.