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Larvae Information Summary for  Argentina sialis
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Main Ref: Matarese, A.C., A.W. Kendall, D.M. Blood and M.V. Vinter 1989
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 4 3.5    
Preanal L. % TL        
Place of development planktonic
Larval area South of southern California to Oregon, 42-46°N
Yolk-sac elongated   pigmented Ref: 35603
Yolk segmented Oil globules one oil globuleposteriorcentralunpigmented
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation: blotch above terminal gut region; 2 ventrolateral pairs widely spaced along gut/trunk juncture; above and below tail tip; ventral to anterior region of yolk sac; internally above roof of mouth.
Post larvae
Striking feature none
Striking shape lateral normal (not striking) dorsal compressed
Striking feature none
Shape of gut elongated
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail no rows
Other melanophores on tail tail completely covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail tail partly covered with melanophores
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early pigmented late pigmented
Peritoneum with row of melanophores
Pectorals normal melanophores at fin base
Pelvics normal (i.e. small or absent) melanophores at fin base
Transverse rugae lining gut; fin rays form in finfold, away from body margin; distinguished from Nansenia candida by presence of internal head pigment, caudal pigment on preflexion larvae, and presence of fewer spots over gut. Pigmentation: internal head pigment; series of ventral trunk blotches extending from pectoral fin to end of gut; 1-2 large blotches postanal with a large caudal blotch; blotches expand with development. Sequence of fin development: caudal, dorsal and anal, pectorals, pelvics.
Meristic characters
  max min mod Ref.
Total number of vertebrae 51 47   265
  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: Luna,Susan M. - 19.01.00
Modified by: Luna,Susan M. - 18.09.00
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