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Larvae Information Summary for  Geotria australis
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Main Ref: Renaud, C.B. 2011
Yolk-sac larvae
  max min mod Ref.
Length at birth (mm)        
Preanal L. % TL        
Place of development  
Larval area Global
Yolk-sac       Ref:  
Yolk   Oil globules  
Post larvae
Striking feature  
Striking shape lateral   dorsal  
Striking feature  
Shape of gut  
Gas bladder   early   late  
Spinal armature   early   late  
Ammocoetes: max. size, 111 mm TL; approx. body proportions, as percentage of TL: 6.2-12.9 prebranchial length, 9.7-17.4 branchial length, 52.5-77.1 trunk length, and 12.0-25.6 tail length; trunk myomeres, 66-83; distinctive characters in ammocoetes from Argentina: cloaca under the anterior half of the second dorsal fin, distinct notch between the confluent second dorsal and caudal fins, caudal fin spade-like, pigmentation coverage (refers to extent and not to intensity or darkness): none on upper lip, subocular, upper prebranchial, lower prebranchial and lower branchial, 1% to <75% on upper branchial, 25% to >75% on caudal fin; distinctive characters in ammocoetes from Chile: cloaca under the origin of the second dorsal fin, second dorsal and caudal fins smoothly confluent, caudal fin rounded, pigmentation: 75% or more on upper lip, subocular, upper prebranchial and lower prebranchial, 25% to >75% on upper branchial, none on lower branchial and on caudal fin; distinctive characters in ammocoetes from Australasia: cloaca under the origin of the second dorsal fin, second dorsal and caudal fins smoothly confluent, caudal fin rounded, pigmentation: 75% or more on upper lip, upper prebranchial and lower prebranchial, none on subocular and caudal fin, 25% to >75% on upper branchial, 1% to <25% on lower branchial. Metamorphosing ammocoetes: 76-112 mm TL.
  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: Hilomen,Teresa - 23.10.13
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