Ostorhinchus cyanosoma reaches 8 cm. Indo-Pacific cardinalfish (Apogonidae) very distinctive by its pale blue-purple translucent body crossed by 6 parallel bright golden-yellow longitudinal lines. Lives in dense schools from 1 to 50 m in crevices and under table corals of entire Indo-Pacific (Red Sea to central Pacific). Nocturnal. Male mouth brooding. Iconic wide-angle photo subject for tight reflective schools in caves and coral shelters.

