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Larvae Information Summary for
Parvilux ingens
| Main Ref: | Moser, H.G. and E.H. Ahlstrom 1996 | |||
Yolk-sac larvae
| max | min | mod | Ref. | |
| Length at birth (mm) | ||||
| Preanal L. % TL | 58 | 36 |
| Place of development | planktonic | |||
| Larval area | California Current region | |||
| 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 | ||
| Striking feature | light organs | |||
| Shape of gut | triangular | |||
| Gas bladder early | pigmented | 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 | |||
| Pigmentation late | ||||
| Rows on tail | dorsal row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| Gut short in preflexion stage, becoming longer in subsequent stages; extremely large, nearly round eye; distinct pigment pattern, with apposing caudal peduncle melanophores in postflexion stage; Br2 phtophores form in postflexion larvae; distinguished from other myctophids with round eyes by: dorsal midline melanophores restricted to 1-2 spots posterior to adipose fin; head and eyes large with the body tapered. Pigmentation: Preflexion: by 5.6 mm, 1 midventral to hindbrain; by 6.5 mm, 1 or more above gas bladder. Flexion: by end of stage, 1 in midline anterior to brain, 1 in midline posterior to cerebellum, and 1 embedded anterior to gut. Postflexion: apposing midline pair on caudal peduncle, dorsal slightly posterior to ventral; largest specimens may have 1 or 2 on dorsal midline of caudal peduncle; myosepta becoming outlined in gut region in late postflexion stage; postflexion larvae have pigment above brain, internally above otic region, lateral to cleithrum, and in anteroventral region of liver (Ref. 265). Sequence of fin development: caudal, pectorals, anal, dorsal, pelvics. | ||||
Meristic characters
| max | min | mod | Ref. | |
| Total number of vertebrae | 38 | 35 | 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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