Some genera have been moved to a new subfamily, while others are now (temporarily) assigned to a specific clade within the family pending further phylogenetic study. Marcos Mirande (2009) proposed several revisions to the family Characidae based upon phylogenetic diagnosis. (2010) proposed that the subfamily Tetragonopterinae should only be used for species within the genus Tetragonopterus. The genus Nematobrycon was previously considered within the subfamily Tetragonopterinae, but this classification, as indeed that of the entire Characidae family, has for some time been deemed incertae sedis. palmeri (Pavanelli in Reis et al., 2003). In some writings the subject species in incorrectly identified as Nematobrycon amphiloxus, a name now considered invalid as a distinct species and designated as a synonym for N. palmeri) in 1911 the name is derived from the Greek for "Brycon with threads," a reference to the extended filaments of the caudal fin. Eigenmann initially erected the genus (for N. This species was described in 1971 by S.H. Males are very aggressive to other fish, especially when enticing females to spawn, and this seems almost continual. This species is a prolific spawner, and some fry will often survive in well-planted tanks. Adults will readily eat the eggs after spawning. Will easily spawn in a tank planted with fine leaved plants, very dimly lit, and very soft and acidic water. Males are larger, more colourful, and develop extended dorsal, caudal and anal fins both sexes have the red iris. Neither species in this genus has an adipose fin. Needs to be in groups but frequently swims individually. Prefers the middle and upper levels in the water column. In a well-planted aquarium with low light (aided by floating plants) and a dark substrate, their colours truly sparkle. This species does not like brightly-lit or sparse environments. palmeri, but the iris of the eye is blue in that species and a bright red in N. Though less often available, this species is the more colourful of the two "Emperor" tetra. Soft (hardness less than 12 dGH) acidic (pH below 7.0) water, temperature 23-27C/73-81F. Water parameters for Rainbow Emperor Tetra In nature it feeds on worms and crustaceans readily accepts most prepared foods including flake and frozen foods like daphnia and bloodworms. Not suitable with quieter tankmates as this is an active fish. Suitable in community tanks with angelfish, other characins, dwarf cichlids, small catfish and loaches, gourami, rasbora and danios. Must be in a group, preferably nine or more so that the aggressiveness of some males will be spread out and not directed at lone fish. Other characins (tetras) in the tank may also be chased by boistrous males. Occurs in sluggish tributaries and quiet small rivers and streams.Ĭompatibility/Temperament: Peaceful, though males can be territorial but rarely causing damage to each other. Origin and Habitat: Rio San Juan basin in western Columbia, South America. Common Name: Rainbow Emperor Tetra, Red Eye Emperor Tetra
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