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Larvae Information Summary for
Lampanyctus parvicauda
| 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 | 60 | 40 |
| 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 | elongated | |||
| Gas bladder early | pigmented | late | pigmented | |
| 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 | dorsal + ventral + lateral row | |||
| Other melanophores on tail | no other melanophores | |||
| Melanophores on head + trunk | melanophores on head + trunk | |||
| Urostyle region early | unpigmented | late | unpigmented | |
| Pectorals | normal without melanophores | |||
| Pelvics | fin rays only without melanophores | |||
| In early preflexion larvae, the gut is straighter than in other species of the genus; body highly compressed, becoming robust in late postflexion stage; snout somewhat blunt; presence of a postanal pigment series unusual for genus; pigment pattern distinct in flexion-postflexion stages; eye slightly elliptical with lunate choroid sliver; Br2 photophores form at about 11.0 mm. Pigmentation: Preflexion-postflexion: initially, 1 on ventral midline of gut just posterior to cleithrum, a pair on terminal gut section, about 8 in postanal ventral midline series; by about 4.0 mm, 1 in midline anterior to forebrain, 1 posterior to each lobe of cerebellum, 1 at dorsum where adipose will form, at lower jaw symphysis, above gas bladder, and 2-5 in postanal ventral series; only 1 at postanal ventral midline with 1 apposing it at adipose fin base in flexion and postflexion larvae. Late postflexion: beginning at about 11 mm, trunk myosepta anterior to pelvic fins become outlined, initially ventrally and progressing dorsad. Sequence of fin development: caudal, dorsal and anal and pectorals, 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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