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Larvae Information Summary for
Tactostoma macropus
| Main Ref: | Moser, H.G. 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 4 | 35904 | ||
| Preanal L. % TL |
| Place of development | planktonic | |||
| Larval area | Northeastern Pacific (California Current region); Northwestern Pacific (Japan) | |||
| Yolk-sac | Ref: | |||
| Yolk | segmented | Oil globules | one oil globule | |
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Pigmentation: paired dorsal and ventrolateral series continuous with dense supra- and infracaudal series in late yolk-sac stage. | ||||
Post larvae
| Striking feature | light organs | |||
| Striking shape lateral | eel-like | dorsal | compressed | |
| Striking feature | light organs | |||
| Shape of gut | tube-like | |||
| Gas bladder early | late | |||
| Spinal armature early | late | |||
| Pigmentation early | ||||
| Rows on tail | dorsal + ventral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | no melanophores on head or trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Pectorals | normal melanophores at fin base | |||
| Pelvics | fin rays only without melanophores | |||
| Body elongate and flat, gut slender, finfold moderate; pectoral fin lost at transformation; decrease in pigment with development; no trailing gut; finfolds unpigmented; distinguished from Chauliodus macouni by presence of pigment; posterior position of dorsal fin (origin of dorsal and anal fin opposite each other); high myomere count; heavy caudal peduncle pigment. Pigmentation: Preflexion: one melanophore per myomere along dorsum and 1-3 melanophores on hypaxial myosepta. Flexion: larvae gradually lose the dorsal then ventral melanophores; lower jaw, isthmus, pectoral fin base, cleithrum, gut terminus, caudal peduncle. Postflexion: paired dorsal series absent in larvae >25 mm. Transformation: 0-1 dorsal myomere melanophores; 1-3 melanophores/myoseptum in hypaxial myoseptum. Sequence of fin development: caudal, dorsal and anal, pectorals and pelvics. | ||||
| L 1st feeding | Ref. | Months of presence of larvae | ||||
| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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