Morphology Data of Austrolebias periodicus
Identification keys
Main Ref. Costa, W.J.E.M., 2006
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral short and / or deep
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth

Can be diagnosed from other species of the Austrolebias alexandri group by the following combination of characters: posterior margin of each pectoral fin in male reaching a vertical between base of second and fifth anal-fin rays (vs. between urogenital papilla and base of second anal-fin ray); origin of dorsal fin either on vertical through anal-fin origin or posterior to it (vs. anterior); and presence of vertical rows of light blue dots on entire flank in larger males (vs. light blue bars) (Ref. 57613).

Description: Dorsal-fin rays 22- 26 in males, 16-18 in females; anal-fin rays 21-25 in males, 17-23 in females. Longitudinal series of scales 26-28; and transverse series of scales 10-12; (Ref. 57613).

Ease of Identification

Meristic characteristics of Austrolebias periodicus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle 16 - 16
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 11 - 11
total 27 - 29


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 16 - 26
Adipose fin absent

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number
Spines total
Soft-rays total 17 - 25

Paired fins

Pectoral Attributes  
Soft-rays   10 - 11
Pelvics Attributes  
Position    before origin of D1
Soft-rays   5 - 6
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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