The squaretails are a genus, Tetragonurus, of scombriform ray-finned fishes, the only genus in the family Tetragonuridae.
They are found in tropical and subtropical oceans, and feed on jellyfish and ctenophores.
Species The three species are: Bigeye squaretail, T. atlanticus Lowe, 1839 Smalleye squaretail, T. cuvieri Risso, 1810 Pacific squaretail, T. pacificus Abe, 1953 Synonyms Tetragonurus simplex accepted as Ruvettus pretiosus
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