Corydoras are from the Callichthyidae family of armoured catfishes, having a hard, armoured body. The name ‘Corydoras’ actually comes from the Greek for helmet (kory) and skin (doras)
The Corydoras genus contains over 180 species, with hundreds more unclassified specimens which are assigned ‘C numbers’. In addition to this, there are also variants of many species, which are sometimes a matter of debate as to whether they are different species, or just geographical variations. Corydoras range in size from 2.5cm (1 Inch) to 12cm (5 Inches), with most reaching between 4-8cm.