Morphology Data of Sinobatis bulbicauda
Identification keys
Main Ref. Last, P.R. and B. Séret, 2008
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

This species is distinguished by the following combination of characters: moderate-sized disc, its width at anterior orbit 5.2-7.8 times mouth width; moderately elongate to short tail, its postcloacal length 79-170% of disc length; relatively large eyes with orbit diameter 4.7-8.8 in horizontal snout and 6.7-10.6 in head lengths, respectively; distal portion of tail expanded laterally in specimens exceeding about 28 cm TL (130 mm DW), width of tail near tip 1.3-2.2 times tail width at its midlength; pectoral-fin radials 66-71; moderate-sized pelvic fins, anterior lobe 12.1-18.1% TL; anterior pelvic-fin lobe rather broad-based, width 1.7-3.2 in distance between pelvic-fin origins; caudal fin rudimentary; tooth rows 20-28, in each jaw of adults; with teeth of adult males with greatly elongated conical cusps; 25-31 abdominal vertebral centra; 148-171 total centra; dorsal surface pale pinkish brown, ventral surface uniformly pale (Ref. 75174).

Description: The medium-sized Sinobatis bulbicauda has affinities to the slightly smaller species S. borneensis (South and East China Seas). Based on it description of the adult male holotype, S. borneensis has a filamentous (vs. bulbous) tail and the snout is relatively longer with preorbital length 6.5 times the interorbital length (vs. 3.9-4.8 in adult males and 3.4-5.7 in all types of S. bulbicauda). Although, adult males of the two species are not identical in size, S. borneensis, 31.7 cm TL (vs. 42.9-43.3 cm TL in S. bulbicauda), however, the 2 species are similar enough to ensure that morphometric biases due to ontogenetic variability are minimal (Ref. 75174).

Ease of Identification

Meristic characteristics of Sinobatis bulbicauda

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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