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Larvae Information Summary for  Tarletonbeania crenularis
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Main Ref: Moser, H.G. and E.H. Ahlstrom 1996
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm) 3      
Preanal L. % TL 54 49    
Place of development planktonic
Larval area California Current region
Yolk-sac       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 tube-like
Gas bladder   early   late  
Spinal armature   early no spines late no spines
Pigmentation early
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on trunk
Pigmentation late
Rows on tail dorsal + ventral row
Other melanophores on tail no other melanophores
Melanophores on head + trunk melanophores on head
Urostyle region   early unpigmented late unpigmented
Pectorals normal with rows of melanophores
Pelvics fin rays only without melanophores
Morphology similar to larvae of Loweina rara; dorsal fin origin not as far posteriad as in L. rara; peppering on pectoral fin rays (absent in L. rara); median and paired melanophores above brain (transverse bar in L. rara); higher counts for total vertebrae (39-42 vs. 37-39) and anal fin rays (17-20 vs. 13-17) compared with L. rara; Br2 photophores form at about 10.0 mm. Distinguished from all other myctophids except L. rara by: dorsal and ventral finfolds greatly enlarged and conspicuously pigmented (more on dorsal); eyes narrow with lunate choroid mass; only Br2 develops during larval period; enlarged ventral pectoral fin ray (lost during transformation); postanal pigment band. Pigmentation: Preflexion: by 3.0 mm, dorsal and ventral apposing blotches posteriad on tail, blotch on dorsal surface of terminal gut section, embedded blotch above foregut, and one anterior to gut; ventral postanal blotch and embedded blotch above foregut lacking in most larvae >5.0 mm; by 7.0 mm, peppering on pectoral fin blade and large melanophores on voluminous median finfold. Flexion: by about 9.0 mm, beginning of 2 pairs of rows on ventral surface of foregut and some (single) at nape; on midbrain and forebrain; transverse pair at cerebellum. Sequence of fin development: pectorals, caudal, anal and dorsal, pelvics.
Meristic characters
  max min mod Ref.
Total number of vertebrae 42 39   31442
  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
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