F I G U R E 1 in Heterochrony and the evolution of the longjaw mudsucker (Gobiidae, Teleostei)

F I G U R E 1 Photos of a preserved Gillichthys mirabilis (a) unlabeled and (b) with labeled landmarks used in geometric morphometric analysis (in blue): (1) anterior tip of nasal bone, (2) first dorsal-fin spine insertion, (3) insertion of first element of second dorsal fin, (4) upper tip of dorsal hypural plate, (5) lower tip of ventral hypural plate, (6) first anal-fin spine insertion, and (7) pelvic-fin spine base. Additional measurements used in geometric morphometric analysis (in green): (1) head length from snout to farthest posterior point of the operculum, (2) head length from snout to dorsal operculum insertion, (3) total upper jaw length, (4) free maxilla length or the posterior portion of the maxilla that is not attached to the head, (5) maximum maxilla depth, and (6) body depth at the origin of the anal fin.