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Larvae Information Summary for  Bathylychnops exilis
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Main Ref: Moser, H.G. 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)        
Preanal L. % TL        
Place of development planktonic
Larval area Northeastern Pacific (California Current region (central California northwards)); Northwestern Pacific (Japan)
Yolk-sac       Ref:  
Yolk   Oil globules  
Rows on tail  
Other melanophores on tail  
Post larvae
Striking feature other
Striking shape lateral eel-like dorsal compressed
Striking feature other
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 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 melanophores at fin base
Pelvics normal (i.e. small or absent) melanophores at fin base
Gut elongate; sac-like stomach (elongate and pointed tip) (Ref. 265); eyes round, dorsolateral orientation, fleshy snout protuberance; early forming pectoral fin and pelvic fin; unique head pigment; alternating median dorso- and ventrolateral blotches; stomach forms early on right side; dorsal longitudinal septum open; high total vertebral count (78-84). Pigmentation: Flexion-postflexion: on upper and lower jaws; internal elongate patches in snout; ventrally and laterally on brain; on filaments of lower limbs of gill arches; internally posteroventral to eye; paired in gular and basibranchial region; internally at pectoral fin base and cleithrum; at cleithral symphysis; 6-7 paired blotches along gut at trunk/gut juncture extending ventrad over gut; postanal bar; heavy on hypural region; 5 median dorsal blotches alternating with ventrolateral blotches; on pectoral and pelvic fin bases. Transformation: same as above but also on dorsal and anal fin bases. Sequence of fin development: caudal and pectorals, pelvics, dorsal and anal. Distinguished from other opisthoproctids by: elongate snout with unique triangular flap at tip; round eyes (anterodorsal); distinctive heavy pigment pattern; number of myomeres (81-84).
Meristic characters
  max min mod Ref.
Total number of vertebrae 84 78   35626
  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
Entered by: Luna,Susan M. - 01.02.00
Modified by: Luna,Susan M. - 07.01.03
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