Hadwenius seymouri Price, 1932 accepted as Synthesium seymouri (Price, 1932) Marigo, Vicente, Valente, Measures & Santos, 2008
Neophasis burti Bray & Gibson, 1991
Neophasis oculata (Levinsen, 1881) Miller, 1941
Neophasis pusilla Stafford, 1904
Stephanostomum baccatum (Nicoll, 1907) Manter, 1934
Stephanostomum californicum Manter & Van Cleave, 1951
Stephanostomum microstephanum Manter, 1934 (uncertain > taxon inquirendum )
Stephanostomum tenue (Linton, 1898) Linton, 1934
Stephanostomum tristephanum McFarlane, 1936 (uncertain > taxon inquirendum )
Synthesium seymouri (Price, 1932) Marigo, Vicente, Valente, Measures & Santos, 2008