SEPIIDAE
*Nearly 20 species of sepiids have been reported from Japanese waters among which only 2 species are included in this key.
No species identification is possible using this key. A more comprehensive key may be offered with additional reference collection in future.
Rostral tip trapezoidal; wing shoulder projected・・・・Sepia esculenta
Rostral tip blunt traiangular; wing shoulder flat・・・Sepia kobiensis