Uruguay Tetra

Cheirodon interruptus has a fusiform shaped body with a maximum standard length of 5.8 cm (2.3 in). The dorsal fin has a single spine and 10 soft rays, while the anal fin has two spines and 18 soft rays.

Cheirodon interruptus is found in South America. It is native to the Uruguay River system, the lower Paraná basin, and coastal rivers in southern Brazil, Uruguay and northern Argentina. It has been introduced to Central Chile. The Uruguay tetra is found in eutropic areas of streams, lagoons and flooded areas where there is abundant aquatic vegetation.

Cheirodon interruptus is classified in the genus Cheirodon, a name which is a combination of the Greek cheír, which means "hand", and odon, meaning "tooth". This refers to the teeth of the type species of the genus, C. pisciculus, which are dilated at their tips with at least five subconoical points on each tooth, with the middle point being longer than the others, showing a resemblance to a hand. The specific name, interruptus, means "interrrupted" in Latin, a reference to the short lateral line of this species.