Morphology Data of Euthynnus affinis
Identification keys
Main Ref. Collette, B.B. and C.E. Nauen, 1983
Appearance refers to Male; Female
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance males alike females
Different colors males alike females
Remarks

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
Cross section oval
Dorsal head profile more or less straight
Type of eyes more or less normal
Type of mouth/snout more or less normal
Position of mouth terminal
Diagnosis

Swim bladder absent. No trace of vertebral protuberances. Anterior spines of first dorsal fin much higher than those mid-way. Interpelvic process small and bifid. Body naked except for corselet and lateral line. Posterior portion of the back with a pattern of broken oblique stripes.

Description: Characterized further by dark blue to iridescent green on upper side with wavy dark bands; silvery white at lower sides and belly; sometimes with several dark spots just above pelvic fin; dorsal rays X-XV+11-15+8-10 finlets, dorsal fin separated by very narrow space; anal rays 11-15+6-8 finlets; pectoral rays 25-29; maxilla extending posterior to middle of eye; jaw teeth are small and conical, about 25-35 on each side of lower jaw; presence of palatine teeth, none on vomer (Ref. 90102).

Ease of Identification

Meristic characteristics of Euthynnus affinis

Lateral Lines 1 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
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 29 - 34
Vertebrae
preanal
total 39 - 39

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   8 - 10
Ventral  6 - 8
Spines total 10 - 15
Soft-rays total 11 - 15
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number
Spines total 0 - 0
Soft-rays total 11 - 15

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   25 - 29
Pelvics Attributes  more or less normal
Position    thoracic  before origin of D1
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Luna, Susan M.
Modified by Valdestamon, Roxanne Rei
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