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Larvae Information Summary for  Sigmops elongatus
( not available )

Main Ref: Watson, W. 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 3.9      
Preanal L. % TL        
Place of development planktonic
Larval area Northeastern Pacific (California Current region); mid-Atlantic Bight; Northwestern Pacific (Japan)
Yolk-sac ovoid     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 spherical or gut loop
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
Pigmentation late
Rows on tail no rows
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head
Urostyle region   early unpigmented late unpigmented
Peritoneum with row of melanophores
Pectorals normal without melanophores
Pelvics fin rays only without melanophores
Anal fin origin slightly anterior to dorsal fin origin; usually 0-1 myomeres between anus and anal fin origin; adipose fin present (develops at about 20 mm SL); moderately narrow eye; little pigment through postflexion stages; dorsolateral pigmentation on hindbrain by 8-11 mm; no caudal pigment; photophores present. Pigmentation: Preflexion-flexion: none initially; over gas bladder by about 4.7 mm; ventrolaterally on hindbrain at about 5.2 mm. Postflexion: dorsally on most of gut by about 10.2 mm; surrounding stomach, beginning at about 11 mm; dorsolaterally on hindbrain, beginning between 8-11 mm. Transformation: increasing on gut region and hindbrain; extending onto midbrain by about 18.9 mm. Sequence of fin development: caudal, anal, dorsal, pectorals and pelvics.
Meristic characters
  max min mod Ref.
Total number of myomeres 41 39   35800
Preanal number of myomeres 18 15   35800
  L 1st feeding Ref. Months of presence of larvae    Ref. 
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod     Sep Oct Nov Dec
Water parameters     Metric characters
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