Bothriembryon Pilsbry, 1894 (original description)
Mactroderma Dall, 1894 accepted as Mactrotoma Dall, 1894 (original description)
Mactrotoma Dall, 1894 (original description)
Micromactra Dall, 1894 accepted as Mactrella Gray, 1853 accepted as Mactrinula Gray, 1853 (original description)
Navanax Pilsbry, 1895 (original description)
Oldroydia Dall, 1894 (original description)
Perostylus Pilsbry, 1894 (original description)
Simomactra Dall, 1894 (original description)
Symmorphomactra Dall, 1894 accepted as Simomactra Dall, 1894 (original description)