Morphology Data of Optivus agrammus
Identification keys
Abnormalities
Main Ref. Gomon, M.F., 2004
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished by the following characters: 20-24 (modally 22) gill rakers; gently curved lateral profile of nape and dorsal surface of head, nearly horizontal in front of dorsal-fin origin, almost straight between eyes; broadly rounded tip of snout; 2.7-2.9 times in SL, depth of head at vertical through upper end of gill opening; snout length is 1.5-2.6 times in eye diameter; the inner row of teeth on premaxilla is noticeably longer than others; relatively short and deep caudal peduncle, depth 0. 9-1.2 in length; dorsal and anal fins are relatively low, third segmented dorsal-fin ray 3.8-4.6 times in SL, first anal-fin ray 5.6-8.2 times in SL; body color greenish brown on back, silvery below; fins almost uniformly pink, though slightly dusky tips to caudal-fin lobes lasting in recently preserved large specimens (Ref. 76814).

Ease of Identification

Meristic characteristics of Optivus agrammus

Lateral Lines Interrupted: No
Scales on lateral line 26 - 26
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 9 - 11
Scale rows below lateral line 12 - 15
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 20 - 24
Vertebrae
preanal 12 - 12
total 26 - 26

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 3 - 3
Soft-rays total 10 - 11
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 9 - 10

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   11 - 13
Pelvics Attributes  
Position    
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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