basicranium length basicranium length from synsphenion The length of a skull from synsphenion to basion. The measurement number and genus from von den Driesch (1979): 6 Cervus, 4 Canis and Ursus, 4 Felis. basicranial axis to synphenion length Canis Ursus Felis Cervus to be replaced with external ontology term Helena Machado