Morphology Data of Grammatorcynus bilineatus
Identification keys
Main Ref. Collette, B.B. and C.E. Nauen, 1983
Appearance refers to
Bones in OsteoBase

Sex attributes

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

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

Mouth relatively small, upper jaw reaching about to middle of eye. Pectoral fins stout. Interpelvic process short and single. No prominent anterior corselet present. Swim bladder present. Vertebrae 14 precaudal plus 17 caudal, total 31 as in mackerel (Scomber and Rastrelliger).

Description: Characterized further by metallic blue-green, shading to silvery below; three keels on caudal peduncle and fin base, middle one largest; most of head and body covered with small scales; two lateral lines, second branching from first below third dorsal spine, passing ventrally along body, rejoining first below last dorsal finlet; large eye, 7-9% of fork length; maxilla reaching below middle of eye; jaws with 20-30 slender conical teeth; vomer and palatines with a patch of small teeth; maximum weight about 3.5 kg (Ref. 90102).

Ease of Identification

Meristic characteristics of Grammatorcynus bilineatus

Lateral Lines 2 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) absent
Gill rakers
on lower limb 13 - 18
on upper limb 4 - 6
total 19 - 24


Dorsal fin(s)

Attributes no striking attributes
Fins number 2
Finlets No. Dorsal   6 - 7
Ventral  6 - 7
Spines total 11 - 13
Soft-rays total 10 - 14
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 10 - 14

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   22 - 26
Pelvics Attributes  more or less normal
Position    thoracic  before origin of D1
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Luna, Susan M.
Modified by Valdestamon, Roxanne Rei
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