Kalmar "Genus Tetrapurus" tana nufin rarrabuwa taxonomic da ake amfani da ita a ilmin halitta don haɗa wani takamaiman nau'in nau'in kifin. nau'in billfish. Jinsunan da ke cikin jinsin Tetrapurus an fi sanin su da "marlins," kuma ana siffanta su da tsayin siffar jikinsu, kaifi, da halayen ƙaura sosai.Saboda haka, ma'anar ƙamus na "Genus Tetrapurus" zai kasance. wani abu kamar: "Rukunin nau'in kifayen kifaye na dangin Istiophoridae, waɗanda aka fi sani da marlins, waɗanda aka san su don tsayin surar jikinsu, lissafin kaifi, da halayen ƙaura."