| Myomeres 28-30 (6-7+22-24 during preflexion stage, 10-12+16-18 in postflexion stage); usually 9 anal fin rays; pelvic fin pigment distal when present, usually absent; dorsal margin unpigmented in preflexion stage; fully pigmented in postflexion stage.
Pigmentation:
Preflexion: initially only dorsally on gas bladder and ventrally in vicinity of myomere 21; under hindbrain after 4 mm; usually dorsolaterally on hindbrain and under forebrain at 4.4 mm; dorsally on hindgut by 4.4 mm; on dorsal margin in vicinity of myomere 13 at 5.1 mm.
Flexion: externally over midbrain and internally over hindbrain by 6.6 mm; increasing under brain; dorsally over entire gut; spreading forward, then both cephalad and caudad along dorsal margin; spreading caudad along ventral margin of caudal peduncle; 1-2 between middle hypurals; over urostyle by 6.6 mm; few externally laterally over hypural area by 6.6 mm.
Postflexion-transformation: increasing over and under brain and on gut; double row on dorsal margin from myomeres 2-26 and on ventral margin from myomeres 17-27 by 7.8 mm; bar forms across hypural area.
Sequence of fin development: pelvics, dorsal, caudal, pectorals, anal. |