Relationship between relative length (CL1) and relative position (CL2) of the crest (A), and the relationship between CL1 and latitude (B) and altitude (C, D). (A, B, C) Red triangles represent specimens with D. galeata mtDNA. Blue circles represent specimens with D. dentifera mtDNA. (D) Green triangles and purple circles represent specimens occurred in the presence and absence of fish predators, respectively.
Ishida et al. BMC Evolutionary Biology 2011 11:209 doi:10.1186/1471-2148-11-209