This member of the Callichthyidae family is a well known favourite amongst Corydoras lovers. The 'Skunk' or 'Arched Cory' is sometimes difficult to pick up in the shops and seems to come and go in periods so you have to snap them up when seen and of course the recently unfolding story of the true C. arcuatus is told below.
This species is sometimes confused with its longer nosed ‘cousin’ Corydoras narcissus, but the length of the snout is the main difference, and also the stripe in narcissus tends to be longer, running into the lower lobe of the caudal fin.
This species was given the CW-number (Corydoras World) of 36 as it had not previously been given a C-number. It is now thought (Grant, S. 2014) that this species, CW036, is the true Corydoras arcuatus instead of the shorter nosed C020