![]() We’ll tell you about what causes it and how it’s diagnosed, as well as why you need to be skeptical of online tests. Ichthyologists debate the function of the adipose fin, doubting its role in swimming due to its small size and lack of stiffening rays or spines. Tetrachromacy is a rare eye condition that allows for increased color vision. While this adipose fin is generally considered the distinguishing feature, some tetras lack this appendage. This adipose fin represents the fourth unpaired fin on the fish, lending to the name tetra, which is Greek for four. Additionally, tetras possess a long anal fin stretching from a position just posterior of the dorsal fin and ending on the ventral caudal peduncle, and a small, fleshy adipose fin located dorsally between the dorsal and caudal fins. Technology, Aerospace Engineering, Astronautical Engineering. Containing four of a specified kind of atom. They ordinarily possess a homocercal caudal fin and a tall dorsal fin characterized by a short connection to the fish’s body. Any of a number of brightly colored, tropical American, characin fishes, often kept in aquariums. Known by such trademarks as Teflon, Fluon, Hostaflon, and Polyflon, PTFE is distinguished by its slippery surface, high melting point, and resistance to attack by almost all chemicals. Tetras generally have compressed, fusiform bodies and are typically identifiable by their fins. polytetrafluoroethylene (PTFE), a strong, tough, waxy, nonflammable synthetic resin produced by the polymerization of tetrafluoroethylene. For example, payara is occasionally known as the "sabretooth tetra" or "vampire tetra". Even vastly different fish may be called tetras. It is short for Tetragonopterus, a genus name formerly applied to many of these fish, which is Greek for "square-finned".īecause of the popularity of tetras in the fishkeeping hobby, many unrelated fish are commonly known as tetras, including species from different families. ![]() Tetra is no longer a taxonomic, phylogenetic term. tetra-, four Farlex Partner Medical Dictionary © Farlex 2012 tetra- Combining form meaning four. Consequently, they are extremely popular for home aquaria. ![]() ![]() Many of these, such as the neon tetra, are brightly colored and easy to keep in captivity. The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal and caudal fins. Freebase Rate this definition: 0.0 / 0 votesĪ tetra is one of several species of small freshwater fish from Africa, Central America and South America belonging to the biological family Characidae and to its former subfamilies Alestidae and Lebiasinidae. tetrahedron / ( ttrhidrn) / noun plural -drons or -dra (-dr) a solid figure having four plane faces. ![]()
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