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Larvae Information Summary for
Magnisudis atlantica
| Main Ref: | Ambrose, D.A. 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL | 72 | 35 |
| Place of development | planktonic | |||
| Larval area | Northeastern Pacific (California Current region); Northwestern Pacific (Japan) | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | duck-billed shape of head | |||
| Striking shape lateral | normal (not striking) | dorsal | normal (not striking) | |
| Striking feature | duck-billed shape of head | |||
| Shape of gut | elongated | |||
| Gas bladder early | absent | late | absent | |
| 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 | no melanophores on head or trunk | |||
| Pigmentation late | ||||
| Rows on tail | lateral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Peritoneum | with row of melanophores | |||
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| Vertebral number (60-69) appears to be the only reliable character to separate early larvae from those of A. risso (72-86); pectoral fin rays (15-18) most numerous in the family and anal fin rays (20-24) are among the fewest; 1 peritoneal pigment patch, increasing to 2 (pre-flexion-flexion stage), and 3 by late postflexion-juvenile stage; anus at final position (64-72%) by 13-15 mm (early postflexion stage). Pigmentation: Preflexion: 1 peritoneal patch increasing to 2. Postflexion: on cranium, snout, jaws, and dorsal and anal fin origins; above and below notochord near end of anal fin; by late postflexion stage, on nape, patch between adipose and anal, and 3 peritoneal patches decreasing in size posteriad. Transformation-juvenile: along dorsal body margin; tail patch expands; crescent-like row on infraorbital region. Sequence of fin development: caudal, anal, dorsal, pectorals, pelvics, adipose. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 69 | 63 | 35950 |
| L 1st feeding | Ref. |
Months of presence of larvae
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| max | Jan | Feb | Mar | Apr | ||
| min | May | Jun | Jul | Aug | ||
| mod | Sep | Oct | Nov | Dec | ||
| Water parameters Metric characters |
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