pica_nuttalli
don't be a twit
Wikipedia: TetraA Tetra is any of a number of species of small South American freshwater fish belonging to the family Characidae and to its former subfamily Alestiidae ("African tetras").
Wikipedia: CharacidaeThe Characidae are a family of freshwater subtropical and tropical fish, belonging to the Characiformes (characins). They originate in the Americas from southwestern Texas and Mexico through Central and South America. They vary in length with the smallest growing to a maximum length of 0.5 in (13 mm).
To some extent the family serves as a junk-basket category and various forms have been, and probably will continue to be, removed into their own families. The tetras belong here, comprising the very similar genera Hemigrammus and Hyphessobrycon, as well as a few related forms. These include the cave and neon tetras. The larger piranhas also belong here.
Badman's: Tetras and Other CharacinsThis group contains some 1500 species
AquariaCentral: Exodon ParadoxusThe Bucktoothed Tetra is a unique and beautiful shoaling Characin from tropical South American rivers and tributaries.
The body shape is typical of all tetras, except the jaws and teeth are heavier and more well-developed. The coloring and pattern are striking and unusual. There are 2 pairs of huge, black occellatus spots - one covering the caudal penduncle, and one just under the upper-back. The rest of the body is white-silver which is tanged with either violet-blue or violet-red. The fins are often pigmented with red or yellow.
These fish shoal in groups of no less than a dozen and no more than 50. Larger schools are often comprised of younger fish. Insatiable insectivores, they will tear apart any invertebrate unfortunate enough to fall in the water or get in their way. The jaws are strong enough, and the teeth (particularly the enscissors) sharp enough to bite a clean hole out of most organisms. A nip from a larger individual is capable of drawing blood.