Ridge Group
Jaw edge nearly straight; posterior corner of lateral wall curves inward・・・・・・OCTOPOTEUTHIDAE
Jaw edge gently curved to jaw angle・・・・・・・MASTIGOTEUTHIDAE / ENOPLOTEUTHIDAE
Jaw edge sharply curved at rostral tip・・・・・・HISTIOTEUTHIDAE / ONYCHOTEUTHIDAE
All Right Reserved Kubodera, 2000