Larvae Information Summary for Parvilux ingens
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Main Ref: Moser, H.G. and E.H. Ahlstrom 1996
Yolk-sac larvae
  min max mod Ref.
Length at birth (mm)        
Preanal L. % TL 36 58    
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
  min max mod Ref.
Total number of vertebrae 35 38   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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