Synonyms: Scymnodon ishiharai, Zameus ichiharai
Common name: Japanese velvet dogfish
Original description species: Yano & Tanaka, 1984
Genus: Scymnodon Barbosa Du Bocage & De Brito Capello
Family: Somniosidae Jordan, 1888
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Centrophorus plunketi, Centrophorus waitei, Centrophorus (Proscymnodon) plunketi, Centroscymnus macracanthus, Centroscymnus plunketi, Centroscymnus waitei, Etmopterus paessleri, Proscymnodon macracanthus, Proscymnodon plunketi, Proscymnodon waitei, Scymnodon plunketi, Spinax paessleri
Common name: Largespine velvet dogfish
Original description species: (Regan, 1906)
Genus: Scymnodon Barbosa Du Bocage & De Brito Capello
Family: Somniosidae Jordan, 1888
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii

Synonyms: Centrophorus ringens, Scymnodon cf. ringens
Common name: Knifetooth dogfish
Original description species: Barbosa Du Bocage & De Brito Capello, 1864
Genus: Scymnodon Barbosa Du Bocage & De Brito Capello
Family: Somniosidae Jordan, 1888
Order: Squaliformes
Superorder: Squalomorphii
Subcohort: Neoselachii
Cohort: Euselachii
Subclass: Elasmobranchii