Embryonic development in Notopterus notopterus. (a) Stage 17, spoon shape, 48:50; nf- neural fold in the tail region; (b) Stage 18: early trunk-tail bud, note the remnant of the evacuation zone, 51h:05min; note somites (som) and the tail bud (tb) at the posterior part; (c) Stage 19: tail-bud bent; Kupffer’s vesicle (Kv) appears in the bent tail bud, 84h:00min;cc - corpus cerebelli around the rhombencephalic area; (d) Stage 20: otic placode (op) and heart beats (h) observed, 92h:25min; (e) Stage 21: fin-fold stage, 95h:25min. Note the lobilineaeliteralis (lll), the otic placode (op) and the embryonic fin fold (ff). (f) Stage 22: eye pigment (e), 122h:05min; note the broadened fin fold (ff) along the body; (g) Stage 23: “C” shape, pre-hatching embryo; note the edge of the caudal fin, and the lobilinealateralis (lll). 146h:50min. Scale bar = 1 mm.