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Larvae Information Summary for  Syngnathus acus
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Main Ref: Bertolini, F., U. D'Ancona, E. Padoa Montalenti, S. Ranzi, L. Sanzo, A. Sparta, E. Tortonese and M. Vialli 1956
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 28 24 26  
Preanal L. % TL     40.5  
Place of development attached to parental body
Larval area to be filled
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail no rows
Other melanophores on tail more than two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head + trunk
Cutaneous bony rings distinct. on the back, every 3-4 rings show some light spots, like transverse stripes (totaly 13-14).
Post larvae
Striking feature tube-like snout
Striking shape lateral eel-like dorsal  
Striking feature tube-like snout
Shape of gut tube-like
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail no rows
Other melanophores on tail more than two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head + trunk
Pigmentation late
Rows on tail no rows
Other melanophores on tail more than two dorso-ventral clusters or bands
Melanophores on head + trunk melanophores on head + trunk
Urostyle region   early pigmented late pigmented
Peritoneum with row of melanophores
Pectorals normal with few scattered melanophores
Pelvics normal (i.e. small or absent)  
Primordial fin absent, definitive caudal developed. Dorsal fin with 35-39 rays, extending over 8 segments, longer than the head, 3-4 anal rays, 12-14 pectoral rays and 9-10 caudal rays. Eye more than twice the primordial space.
Meristic characters
  max min mod Ref.
Total number of myomeres 60 56 58  
Preanal number of myomeres 19 17 18  
  L 1st feeding Ref. Months of presence of larvae
max     Jan Feb Mar Apr
min   May Jun Jul Aug
mod 26   Sep Oct Nov Dec
Water parameters     Metric characters
Entered by: Papasissi,Christine - 29.10.90
Modified by: Luna,Susan M. - 21.12.07
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