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Larvae Information Summary for  Pegusa lascaris
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Main Ref: Russell, F.S. 1976
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 3.46 2.26 2.86  
Preanal L. % TL 56.6 40.5 48.5  
Place of development planktonic
Larval area to be filled
Yolk-sac spherical   unpigmented Ref:  
Yolk segmented Oil globules more than one oil globule
Rows on tail no rows
Other melanophores on tail tail with single melanophore
Melanophores on head + trunk melanophores on head + trunk
Black chromatophores on the body, primordial fin, and yolk of the embryo.
Post larvae
Striking feature none
Striking shape lateral short and/or deep dorsal compressed
Striking feature none
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 ventral row
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail ventral row
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early pigmented late pigmented
Peritoneum covered with melanophores
Pectorals normal  
Pelvics normal (i.e. small or absent)  
At about 7.5 mm, the urochord begins to turn up. Aggregates of chromatophores on the dorsal and anal fin membranes towards the posterior end of the body are observed which together form a distinct postanal bar. Head shape typical of Soleidae, i.e.with upper profile concave and posteriorly not clearly distinct from the visceral sac.
Meristic characters
  max min mod Ref.
Total number of vertebrae     46 263
  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
Entered by: Papasissi,Christine - 19.10.90
Modified by: Luna,Susan M. - 28.02.91
Checked by: Giovanardi,Otello - 15.02.91
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