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Larvae Information Summary for
Diaphus pacificus
| Main Ref: | Moser, H.G. and E.H. Ahlstrom 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | 2 | |||
| Preanal L. % TL | 64 | 44 |
| Place of development | planktonic | |||
| Larval area | California Current region/Taiwan Strait | |||
| Yolk-sac | Ref: | |||
| Yolk | Oil globules | |||
| Rows on tail | ||||
| Other melanophores on tail | ||||
Post larvae
| Striking feature | light organs | |||
| Striking shape lateral | short and/or deep | dorsal | ||
| Striking feature | light organs | |||
| Shape of gut | spherical or gut loop | |||
| Gas bladder early | pigmented | late | ||
| Spinal armature early | no spines | late | no spines | |
| Pigmentation early | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | tail with single melanophore | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Pigmentation late | ||||
| Rows on tail | no rows | |||
| Other melanophores on tail | one dorso-ventral cluster or band | |||
| Melanophores on head + trunk | melanophores on trunk | |||
| Urostyle region early | pigmented | late | pigmented | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| Deep and compressed, becoming somewhat stout; head relatively large, eyes slightly elliptical with lunate choroid sliver; notochord flexion and transformation at small size; caudal melanophore typical of genus; early coalescense of postanal series; melanophore anteriorly on ventral margin of gut; Br2, PO1, and PO5 photophores form by about 6.6 mm; lower PVO, PO2, and PO3 by about 7.5 mm; Br3, PO4, upper Op, VLO, VO series, and some Aoa the first to form at transformation. Pigmentation: Preflexion: initially, up to 7 dashes in postanal median ventral series (coalescing to 1 by 2.8 mm), 1 at future hypural region, 1 anteriorly on ventral margin of gut and a pair on terminal gut section; by 2.8 mm, 1 embedded above developing gas bladder. Flexion-postflexion: same pattern; up to 4 in vertical series at posterior edge of hypural; 1 at anal fin insertion. Sequence of fin development: caudal, dorsal and anal, pectoral, pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 33 | 31 | 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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