Fins - D1-VII, [6-8] first two rays elongate in Sonora and central Baja populations in spring, not so in other populations; D2-11[10-12]; pectoral - 18-19 [17-20], fin ovate with middle ray the longest; anal - 10[9-11]; segmented caudal 17[15-18] fin rounded; pelvic I,5 all rays branched, frenum complete, disk rounded extending almost to anus.
Head - No barbels present; maxilla reaching to under middle of pupil in females and young males, to end of pupilor eye in adult males; interorbital narrow - less than 1/2 eye diameter;
Papillae - A transverse pattern; three vertical rows in front of row b; row 5s connected to the anterior of row b and joining row 5i/61; row 1-3 extending from near lower orbit to row d; row 5i/6i extending below the level of row d. row n long, extending close to midline; row x in segments.
Color - Coloration of living and fresh individuals - Head with scattered white spots and reticulated green markings surrounded by brown pigment. Sides of head and throat yellowish green, darker in males than in females. Head bands dark green. interspaces light green. Body light green with vertical streaks of white, sometimes breaking up into a series of white spots; white bars and spots surrounded by orange pigment. Belly with guanine and scattered melanophores. Breast dusky in young and in mature males; with light green pigment in mature males; a triangular, bright yellow patch covering breast in mature females. First dorsal green at base, red on upper third, two black bands surrounded by orange pigment. Second dorsal reddish. Basal half of anal orange; tip white; a few scattered red spots on membrane. Pelvic greenish. Caudal with five to seven reddish bands (Hoese, 1971)
Coloration in alcohol - Background color of head and body brown or tan. Head and body with dark brown reticulated transverse bands. Dorsal surface of head with a single broad band in northern populations; other populations with two bands. A broad transverse band on dorsal surface of nape. Operculum with a black spot near center. Operculum and preoperculum with small scattered white spots. A longitudinal bar extending from end of jaw backward to middle of cheeks, sometimes obscure. Sides of body with 7 to 9 dark transverse bands; posterior bands faint and sometimes obscure; centers of bands along midside with a series of short black dashes, sometimes not discernible. End of caudal peduncle with a vertical dark bar. Pectoral base with an upper and lower spot, sometimes connected to form a bar. Breast densely covered with melanophores in males, in females smaller than 20 mm from the southern Gulf of California and in all females collected from early winter in northern populations; breast melanophores begin to disappear in females in February and are completely lost by April in northern populations. Females longer than 20 mm from southern populations lack breast melanophores. Dorsal fins with three longitudinal black bars. Caudal fin with five to seven sinuous transverse bands. Anal fin dusky near tip, white at tip. Pectoral fin clear to dusky. Pelvic dusky, darker in males. Urogenital papilla of males densely covered with melanophores except at tip; papilla either lacking melanophores or with a few scattered melanophores in females. (Hoese, 1971)
Distribution - Found only in the Gulf of California from Los Frailes to San Felipe in Baja and from Guaymas to Punta Borrascoso, Sonora.
Notes - Urogenital papilla of males slender, not bilobed