Morphology Data of Urogymnus asperrimus
Identification keys
Abnormalities
Main Ref. Compagno, L.J.V., D.A. Ebert and M.J. Smale, 1989
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 other
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales placoid scales
Diagnosis

Diagnosis: A heavily armored stingray lacking a venomous barb; young with large, flat denticles on upper surface, and large juveniles and adults with additional sharp conical thorns and small, pointed denticles (Ref. 5578).

Description: Very large stingray with an extremely thick, oval disc, with broadly rounded outer corners (Ref. 5578, 81259). Snout broadly rounded (Ref. 5578). Dorsal surface very rough, its central area covered with flattened, heart-shaped, dermal denticles, and a very large number of conical, pointed, thorny tubercles scattered over the entire disc (Ref. 81259). Tail slender, about as long as body, very spiny, but sting always lacking; ventral tail fold reduced or absent (Ref. 5578, 81259).

Colouration: Light grey or whitish dorsally, white ventrally; tail whip blackish (Ref. 5578, 81259).

Ease of Identification

Meristic characteristics of Urogymnus asperrimus

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
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total

Fins

Dorsal fin(s)

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

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

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