Order Characiformes
Family Characidae (American Tetras)
Subfamily Aphyocharacinae
Genus Rachoviscus.
— Rachoviscus crassiceps [Myers, 1926]. Brazil. 4.5 cm, males are larger. Distantly resembles an ornate tetra. Body is deep, yellow-pink with a bluish-gray sheen. Dorsal, caudal, and pelvic fins are yellow in both sexes, acquiring reddish edges with age. Males have an anal fin with a larger surface area, colored reddish-brown on the lower margin. The male is brighter, larger, and more slender than the female.
Genus Xenagoniates.
— Xenagoniates bondi [Myers, 1942]. (Eng: Long Finned Glass Tetra). Colombia, Venezuela, Orinoco River basin. 6 cm. These fish are just as glassy and translucent, possessing an almost identical body contour to the glass catfish Kryptopterus bicirrhis, but lacking barbels. A coffee-golden stripe runs along the body. The female is plumper. Aggressive; these fish defend their territory against conspecifics. They nip the fins of other fish. During aquarium acclimatization, they hardly accept food and often perish.
Aphyocharax anisitsi, Aphyocharax alburnus, Aphyocharax dentatus.
Thayeria boehlkei, Thayeria ifati, Thayeria obliqua. 
