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Previously given the CW number of 32. Description: Dorsal spines (total): 2; Dorsal soft rays (total): 7-8; Anal soft rays: 7 - 9. Corydoras knaacki (now Hoplisoma knaacki)is distinguished from its congeners by having the following combination of characters: a longitudinal black stripe along midline of flank; short mesethmoid, with anterior portion smaller than 50% of the bone length; serrations on posterior margin of pectoral spine directed towards the tip of the spine; dorsal fin with the region of the first branched ray, including membrane, with black pigmentation, the remaining areas with irregular black blotches; lacking a vertically elongated black blotch across the eyes; snout with conspicuously rounded moderately-developed black spots; and ventral expansion of infraorbital 1 moderately developed. A small species that is similar in appearance to Hoplisoma sp. (C120) but lacks the black in the dorsal fin. Lineage: Placed in Lineage 9, the "short-snouted" species with the designated type species: C. punctatus. A revision in the future would constitute the resurrection of the genus name Hoplisoma (Agassiz, 1846). As of the latest revision (Dias et al 2024) Corydoras knaacki 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 tank mates such as Tetras, Rasboras and Danios or in a species tank for breeding purposes. Diet: A good quality flake food and tablet food for adults with sporadic feedings of frozen or live food will keep your Corydoras in good health. Etymology: The specific name knaacki: Named for the late Dr. Joachim Knaack (2 January 1933 – 5 December 2012), German physician and biologist. He was an amateur ichthyologist and aquarist who devoted more than 60 years of his life for the study of South American catfishes, especially Corydoras. Remarks: This species is still found on some online sources as Corydoras knaacki.

CW032

Corydoras knaacki

Callichthyidae

South America: Peru, Madre de Dios.

Male: 5.0cm (2ins) Female: 5.5cm (2¼ins)

22-26°C (71-79°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.
Fuller, I.A.M. & Evers, H-G: 2005 Identifying Corydoradinae Catfish Ian Fuller Enterprises. 384 p.
Ian A. M. Fuller & Hans-Georg Evers (2011). Identifying Corydoradinae Catfish Supplement 1. Ian Fuller Enterprises.
Tencatt, L.F.C. and H.-G. Evers, 2016. A new species of Corydoras Lacépède, 1803 (Siluriformes: Callichthyidae) from the río Madre de Dios basin, Peru. Neotrop. Ichthyol. 14(1) e150019:1-14.
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