Morphology Data of Okamejei cairae
Identification keys
Main Ref. Last, P.R., Fahmi and H. Ishihara, 2010
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 other
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales placoid scales

This species is distinguished by the following set of characters: disc with narrowly rounded apices, not broad, width 61-70% TL, 1.2-1.3 times its length; snout angle 84-106°; moderately long tail, length 0.9-1.1 in distance from snout tip to rear of cloaca; slender tail, width 1.2-1.7 times height at its midlength, 1.1-1.7 times at first dorsal-fin origin; pre-upper jaw length 14-16% TL, 1.8-2.1 times internasal width; ventral length 27-30% TL; snout length 2.8-3.6 times interorbital width; orbit diameter 93-103% interorbital width in large males, 69-89% in females; first dorsal-fin height 2.3-3.0 its base length; distance from first dorsal-fin origin to tail tip 4.1-5.4 times first dorsal-fin base length, 2.9-3.2 times caudal-fin length; medium sized pelvic fins, length of posterior lobe 15-17% TL, length of anterior lobe 78-92% of posterior lobe; adult clasper about 22% TL, connected to pelvic-fin inner margin at about 40% of its length from cloaca in adult male; clasper glans expanded slightly, soft, claw-like funnel; anterior margins of both surfaces of disc of males with denticle bands, no dorsal bands in females and juveniles; 1-3 nuchal thorns present; malar thorn patch elongate and posteriorly positioned; tail thorns very small (rudimentary and possibly deciduous in mature males), in 5 irregular rows in both sexes and juveniles; total pectoral radials 78-84; centra: trunk 24-31, predorsal 68-75, total 123-141; 40-51 tooth rows in upper jaw; mainly yellowish to brownish with variable size clusters of fine brownish spots (sometimes faint) over most of dorsal disc; rostral cartilage not strongly demarcated from rest of snout; prominent, dark brown ocellate markings near rear tip, and often near center of each pectoral fin; ventral surface usually pale to medium greyish brown over head and abdomen, distinctly darker than paler area around margin of disc; ventral sensory pores large, silvery white with dark margins when fresh, uniformly black in preservative, not surrounded by greyish blotches, none on abdomen and pelvic girdle; each dorsal fin with a dark anterior saddle, caudal fin with 2 dark bars (Ref. 84285).

Ease of Identification

Meristic characteristics of Okamejei cairae

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
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  
Pelvics Attributes  
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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