Trigonotretidae is an extinct family of articulate brachiopods belonging to the order Spiriferida.
These stationary epifaunal suspension feeders lived in the Carboniferous and Permian periods, from 360.7 to 252.3 Ma.
Genera Aperispirifer Waterhouse, 1968 Betaneospirifer Gatinaud, 1949 Blasispirifer Kulikov, 1950 Brachythyrinella Cartorhium Cooper and Grant, 1976 Costatispirifer Archbold and Thomas, 1985 Crassispirifer Archbold and Thomas, 1985 Cratispirifer Archbold and Thomas, 1985 Fasciculatia Waterhouse, 2004 Frechella Fusispirifer Waterhouse, 1966 Gibbospirifer Waterhouse, 1971 Gypospirifer Cooper and Grant, 1976 Imperiospira Archbold and Thomas, 1993 Kaninospirifer Lepidospirifer Cooper and Grant, 1969 Neospirifer Fredericks, 1919 Occidalia Archbold, 1997 Pondospirifer Waterhouse, 1978 Quadrospira Archbold, 1997 Saltospirifer Cisterna and Archbold, 2007 Septospirifer Waterhouse, 1971 Sulciplica Waterhouse, 1968 Trigonotreta Koenig, 1825
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