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Larvae Information Summary for  Argyropelecus lychnus
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Main Ref: Watson, W. 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4.6      
Preanal L. % TL        
Place of development planktonic
Larval area California Current region
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Pigmentation: internally along notochord at last 2-6 myomeres.
Post larvae
Striking feature light organs
Striking shape lateral hatchet-like dorsal tadpole-like
Striking feature light organs
Shape of gut elongated
Gas bladder   early   late  
Spinal armature   early   late  
Pigmentation early
Rows on tail lateral row
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 no melanophores on head or trunk
Urostyle region   early pigmented late pigmented
Pectorals normal without melanophores
Pelvics fin rays only without melanophores
Upper preopercular spine bent downward whereas same spine in A. sladeni is pointed slightly upward; specimens described to 15 mm SL appear to lack pigment on postanal body, specifically in the peduncle area; presence of frontal crest; internal pigment at last 2-6 myomeres; relatively long preanal length and very narrow eye with conical choroid tissue. Pigmentation: Yolk-sac - postflexion: internally along notochord at last 2-6 myomeres. Transformation: over gas bladder; around stomach; on frontals between eyes; over midbrain and hindbrain by about 9 mm; subsequently increasing on opercular area, along supracleithrum/posttemporal region, and on gut area; internal caudal peduncle pigment condenses. Sequence of fin development: caudal, anal, pectorals, dorsal, pelvics.
Meristic characters
  max min mod Ref.
Total number of myomeres 37 35   35838
Preanal number of myomeres 18 9   35838
  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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