Species: Diapterus brevirostris, Peruvian mojarra, Short-snout mojarra

Diapterus brevirostris Sauvage, 1879

Peruvian mojarra, Short-snout mojarra

Body rhomboidal (depth ~ 50% of SL), compressed;   the lower profile of the head distinctively concave; the mouth highly extensible, pointing downward when protruded; lower border of preopercle finely serrated; bone under front of eye with smooth border; teeth inside throat all pointed; dorsal rays IX, 10, elevated at front,  slight notch between spiny and soft dorsal, 2nd  spine longer than distance between tip of snout and rear of eye; anal rays III, 8, second spine very long and thick; dorsal and anal fin lobes long; pectoral fins relatively long, reaching slightly beyond anal fin origin; tail fin deeply forked, with long pointed lobes; lateral line along longitudinal axis of tail base; scales on front of body not larger than those at rear, conspicuous and finely rough, covering most of head and body; dorsal and anal fins fold into a high scaly sheath along their bases; lateral-line scales 37-40.