Morphology Data of Rhinobatos manai
Identification keys
Main Ref. White, W.T., P.R. Last and G.J.P. Naylor, 2016
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 (see remarks)
Cross section flattened
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

This species is distinguished by the following set of characters: a wedge-shaped disc, with its

dorsal surface covered in minute dermal denticles but without thorns; long snout, its length 3.6 times interspiracular distance; moderately large orbit, its diameter 1.7 times spiracle length; oblique nostrils, its length 1.6 times internarial distance; the anterior nasal flaps are inserted into internarial space well away from nostril margin; posterior nasal flaps are broad; ridges of rostral cartilage well-separated dorsally and almost parallel; narrow prebranchial sensory-pore patch, extending to first gill slit; distance between first gill slits is 1.5 times distance between fifth gill slits; distance between fifth gill slits is 3.4 times in ventral head length; long postscapular sensory canal, not grooved and extending more than three-quarters distance to pectoral-fin insertions; moderately tall dorsal fins; pelvic fin's inner margin is shorter than its base; interdorsal distance is more than 3.1 times first dorsal-fin base; outer spiracular fold is distinctly larger than the inner fold; dorsal margin of caudal fin ca. 2 times preventral margin; post-synarcual (free) vertebral centra 171; total vertebral centra 180; nasal lamellae 52; dorsal disc is brownish and covered with well defined rusty brown spots and blotches and poorly defined white spots with greyish edges (Ref. 117108).

Ease of Identification

Meristic characteristics of Rhinobatos manai

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 )
Entered by Capuli, Estelita Emily
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17