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Larvae Information Summary for
Symbolophorus evermanni
| Main Ref: | Moser, H.G. and E.H. Ahlstrom 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 3 | |||
| Preanal L. % TL | 64 | 56 |
| Place of development | planktonic | |||
| Larval area | NE Pacific (California Current region); SW Indian Ocean (Agulhas Current Region); NW Pacific (Japan) | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | light organs | |||
| Striking shape lateral | normal (not striking) | dorsal | tadpole-like | |
| Striking feature | light organs | |||
| Shape of gut | tube-like | |||
| Gas bladder early | late | |||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| 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 | melanophores on trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | other melanophores at fin base | |||
| Pelvics | fin rays only without melanophores | |||
| Aliform pectoral base; head large, flattened; slightly stalked eyes in preflexion to early postflexion stages; narrow elliptical eyes in preflexion stage, becoming oval in postflexion stage; conical ventral choroid tissue; pigment sparse; Br2 photophores form from 6.5-7.0 mm. Pigmentation: Preflexion: by 3.0 mm, up to 2 postanal ventral margin, pair on terminal section of gut, 0-2 pairs along gut (sometimes missing on one side), and pair at cleithral symphysis; by 5.0 mm, pair at lower jaw symphysis and some have pair on isthmus. Flexion-postflexion: series basally on pectoral fin rays; lacking on postanal and gut regions. Sequence of fin development: pectorals, caudal, anal, dorsal, pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 38 | 36 | 31442 |
| 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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