Dorsal spines (total): 2; Dorsal soft rays (total):
7-8; Anal soft rays: 7 - 9. Corydoras 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
developedA small species that is similar in appearance
but lacks the black in the dorsal fin. 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 Hoplosopma (Agassiz, 1846).
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.
Remarks:CW032 has now been
described by Tencatt & Evers, 2016 as Corydoras
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
Peru, Madre de Dios.
Male: 5.0cm (2ins) Female:
www.corydorasworld.com www.gowildperu.com 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. Fuller, I.A.M. &
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. Alexandrou, Markos
& Taylor, Martin. (2011). Evolution,
ecology and taxonomy of the Corydoradinae revisited.