Rocio

Juan J. Schmitter-Soto, 2007, A systematic revision of the genus Archocentrus (Perciformes: Cichlidae), with the description of two new genera and six new species., Zootaxa 1603, pp. 1-78 : 8

Key to species of genus Rocio

9a(5a) Pelvic fins usually falling short of anal fin origin; distally two scale rows between longest dorsal-fin rays; dentary pores usually 4, sometimes 5; total gill-rakers on first arch 8-10; lateral blotch rounded (Fig. 25); isolated secondary pored scales on caudal fin in addition to pores on extended lateral line; abdomen reddish in life.................................................................................................... Rocio ocotal

9b Pelvic fins almost always reaching anal fin origin; distally one scale row between longest dorsal-fin rays; dentary pores always 4; total gill-rakers on first arch 9-12; lateral blotch squarish; no pored scales on caudal fin, other than one or two on extended lateral line; abdomen not reddish in life ............................ 10

10a(9b) Maxilla reaching both an imaginary vertical line from anteriormost rim of orbit, and a horizontal line from inferiormost rim of orbit; orbital diameter 25-31% of head length and greater than 85% of snout length; cheek-scale rows 7; scales from vent to interpelvic scale 9-10; dorsal and anal fins not bearing filaments; spots on side of body larger than scales and not clearly aligned ....................... Rocio gemmata

10b. Maxilla reaching only a horizontal line from inferiormost rim of orbit, not a vertical line from anteriormost rim of orbit; orbital diameter 21-25% of head length and less than 80% of snout length; cheek-scale rows modally 6 (4-7); scales from vent to interpelvic scale 10-13; dorsal and anal fins usually bearing filaments; spots on side of body smaller than scales and aligned in ca. 15 regular series (Fig. 24) .................................................................................................... Rocio octofasciata