Acmaea oblongata Yokoyama, 1926 accepted as Siphonacmea oblongata (Yokoyama, 1926) (original description)
Bela candida Yokoyama, 1926 † accepted as Oenopota candida (Yokoyama, 1926) (original description)
Bela dissoluta Yokoyama, 1926 † accepted as Granotoma dissoluta (Yokoyama, 1926) † (original description)
Bela exquisita Yokoyama, 1926 accepted as Curtitoma exquisita (Yokoyama, 1926) (original description)
Bela yanamii Yokoyama, 1926 † accepted as Retifusus virens (Dall, 1877) (original description)
Crenella delicatula Yokoyama, 1926 accepted as Crenella decussata (Montagu, 1808) (original description)
Leda sadoensis Yokoyama, 1926 accepted as Nuculana pernula (O. F. Müller, 1779) (original description)
Minolia hilarula Yokoyama, 1926 † accepted as Conotalopia hilarula (Yokoyama, 1926) † (original description)
Ocenebra lumaria Yokoyama, 1926 accepted as Ocinebrellus lumarius (Yokoyama, 1926) (original description)
Odostomia (Egilina) marielloides var. gracilis Yokoyama, 1926 † accepted as Parthenina gracilis (Yokoyama, 1926) accepted as Egilina gracilis (Yokoyama, 1926) (original description)
Odostomia (Odostomia) suboxia Yokoyama, 1922 accepted as Odostomia suboxia Yokoyama, 1922 (additional source)
Pecten foedus Yokoyama, 1926 † accepted as Azumapecten foedus (Yokoyama, 1926) † accepted as Chlamys foeda (Yokoyama, 1926) † (original description)
Pecten heteroglyptus Yokoyama, 1926 † accepted as Chlamys cosibensis (Yokoyama, 1911) † (original description)
Pecten intuscostatus var. multicostata Yokoyama, 1926 † accepted as Parvamussium alaskense (Dall, 1871) (original description)
Pecten plebejus Yokoyama, 1926 † accepted as Yabepecten tokunagai (Yokoyama, 1911) † (original description)
Rissoa (Apicularia) sadoensis Yokoyama, 1926 † accepted as Rissoa sadoensis Yokoyama, 1926 † (original description)
Rissoa (Cingula) mundana Yokoyama, 1926 accepted as Falsicingula mundana (Yokoyama, 1926) (original description)
Rissoa akibai Yokoyama, 1926 † accepted as Alvania akibai (Yokoyama, 1926) (original description)
Rissoa asura Yokoyama, 1926 † accepted as Frigidoalvania asura (Yokoyama, 1926) (original description)
Rissoa dharma Yokoyama, 1926 † accepted as Cingula dharma (Yokoyama, 1926) † (original description)
Rissoa lusoria Yokoyama, 1926 † (original description)
Rissoa maya Yokoyama, 1926 † (original description)
Rissoa sitta Yokoyama, 1926 accepted as Frigidoalvania sitta (Yokoyama, 1926) (original description)
Rissoina (Morchiella) [sic] accepted as Moerchiella G. Nevill, 1885 (basis of record)
Rissoina fortunata Yokoyama, 1926 † (original description)
Rissoina occulta Yokoyama, 1926 † (original description)
Rissoina sawanensis Yokoyama, 1926 † (original description)
Rissoina tabatai Yokoyama, 1926 † (original description)
Thyasira ozawai Yokoyama, 1926 † (original description)
Trophon acharya Yokoyama, 1926 † accepted as Trophonopsis acharya (Yokoyama, 1926) † (original description)
Trophonopsis acharya (Yokoyama, 1926) † (original description)
Turbonilla (Cingulina) morsei Yokoyama, 1926 † accepted as Acirsa morsei (Yokoyama, 1926) (original description)
Turbonilla yanamii Yokoyama, 1926 † accepted as Tachyrhynchus yanamii (Yokoyama, 1926) (original description)

Japan for Minolia hilarula Yokoyama, 1926 † 
Sado Island for Bela dissoluta Yokoyama, 1926 † 
Sado Island for Pecten foedus Yokoyama, 1926 † 
Sado Island for Pecten heteroglyptus Yokoyama, 1926 † 
Sado Island for Pecten plebejus Yokoyama, 1926 †