Percomorphacea (Beloniformes, Gasterosteiformes). A, Platybelone argalus, 15 mm Standard Length (SL), BLZ 6131. B, Hemirhamphus brasiliensis, 19.5 mm SL, BLZ 7071. C, Hemirhamphus balao, 34 mm SL, BLZ 7304. D, Cosmocampus albirostris, 8.5 mm SL, BLZ 6414. E, Penetopteryx nanus, 19 mm SL, BLZ 8337. F and G, close-up photographs of Platybelone argalus (A) and Penetopteryx nanus (E), respectively, showing abdominal iridophores. Photos A, D, E by Lee Weigt and Carole Baldwin; B, C by Julie Mounts and David Smith.