Jérôme,
the frontal carina well developed with four tooth-like tubercles medially is more evident in
C. terminata than in other species of the
ignita group.
However, when the tubercles are clearly distinct ... well ... very likely you're looking at
C. terminata.
A combination of different diagnostic characteristcs should guide you to
C. terminata. In this case the frontal carina is similar to that of
C. terminata, but other characters not...
Cheers
Paolo