Abstract
Cyprinodon bobmilleri is a new species from Bano de San Ignacio, a saline, thermal spring in the San Fernando basin, Nuevo Le6n, Mexico. The nearest relative appears to be C. variegatus, the widespread, primarily coastal species. The two species are similar in meristic counts and overall shape and coloration. The new species is more rhombic in body shape, has a more acute snout, and has a slightly higher mouth. The adpressed pectoral fins in C. bobmilleri reach to the middle of the dorsal fin base, covering most of the pelvic length; they reach only to the origin of these fins in C. variegatus. The sides are spotted in C. bomillleri, obscured in adult mature males, and typically barred in C. variegatus. The dorsal fin in female C. bobmilleri has a weakly developed ocellus, which is pronounced in C. variegatus. It also has two rows of three to four dark spots that are absent in C. variegatus. The new species also differs from C. variegatus in several morphometrics.
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