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. While this adipose fin is generally considered the distinguishing feature, some tetras lack this appendage. Greek see k w etwer- in Indo-European roots. This adipose fin represents the fourth unpaired fin on the fish, lending to the name tetra, which is Greek for four. Containing four of a specified kind of atom, radical, or group: tetrachloride. 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. rahedron te-tr-h-drn plural tetrahedrons or tetrahedra te-tr-h-dr : a polyhedron that has four faces Illustration of tetrahedron Did you know The simplest tetrahedron is made of four equal-sided triangles: one is used as the base, and the other three are fitted to it and each other to make a pyramid. TETRA is targeted primarily at the mobile radio needs of public security & safety, public transportation, oil & gas, utilities, government, etc. They ordinarily possess a homocercal caudal fin and a tall dorsal fin characterized by a short connection to the fish’s body. Tetras generally have compressed, fusiform bodies and are typically identifiable by their fins. For example, payara is occasionally known as the "sabretooth tetra" or "vampire tetra". What does TETRA mean as an abbreviation 27 popular meanings of TETRA abbreviation: 50 Categories. 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. 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. Tetras come from Africa, Central America, and South America, belonging to the biological family Characidae and to its former subfamilies Alestidae and Lebiasinidae. Random sequences of tetrominoes, or tetrads, fall onto a playing field. Tetra is the common name of many small freshwater characiform fishes. ( Tetra is also any of the tropical freshwater fishes of the genus Hemigrammus.) The premise of the game is fairly simple. The Characidae are distinguished from other fish by the presence of a small adipose fin between the dorsal and caudal fins. Tetra is a Greek numerical prefix meaning four, and tennis was the game designer’s sport of choice. 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.
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