to the species pairC. obscurus/C. galapagensisand 99.8–100%
to the species pair C. tilstoni/C. limbatus. The former two species
are very similar to one another morphologically and genetically,
the latter two form part of a trio of species (the third one being
C. amblyrhynchoides) which are also very closely related to one
another (Ward et al., 2008)