Classification / Names
Common names | Synonyms | Catalog of Fishes (gen., sp.) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii (sharks and rays) > Rajiformes
(Skates and rays) > Rajidae
Etymology: Orbiraja: Name from Latin word 'orbis' meaning circle, referring to the paired, ring-like pectoral-fin ocelli in all three nominal species.; jensenae: Named for the cestode parasitologist, Dr Kirsten Jensen. More on authors: Last & Lim.
Environment: milieu / climate zone / depth range / distribution range
Marine; benthopelagic; depth range 110 - 118 m (Ref. 84287). Tropical
Western Pacific: Philippines.
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 53.3 cm TL male/unsexed; (Ref. 84287)
Morphology | Morphometrics
This small to medium-sized rostrorajin skate (to about 53 cm TL) is distinguished by the following combination of characters: disc possess narrowly to broadly rounded apices, its width 59-71% TL, 1.1-1.2 times its length; snout angle is 88-98°; tail relatively short in females (length 0.8-0.9 in distance from snout tip to rear of cloaca) and longer in adult male (length 1.1 times distance from snout tip to rear of cloaca); tail width 1.5-1.8 times height at its midlength, 1.4-1.7 times at first dorsal-fin origin; pre-upper jaw length is 17-18% TL, 2.0-2.2 times internasal width; ventral head length is 29-32% TL; snout length is 3.3-3.4 times interorbital width; orbit diameter 67-85% interorbital width; first dorsal-fin height 2.0-2.7 in its base length; long procaudal length, its distance from first dorsal-fin origin to tail tip 3.1-4.0 times first dorsal-fin base length, 3.2-6.3 times caudal-fin length; the pelvic fins of medium size, length of posterior lobe 16-18% TL, length of anterior lobe 71-83% of posterior lobe; adult male without malar thorn patches; alar thorn patches are small, broadly oval; adult clasper with greatly extended components spike and sentinel; accessory terminal 2 cartilage with strongly articulated medial distal extension, partly overlaying axial cartilage on median margin; anterior margins of both surfaces of disc of females with narrow denticle bands; the single median series of thorns extending along entire midline of disc; tail thorns are well developed, numerous, in 3 closely spaced median rows and irregular lateral row on each side (absent from dorsolateral region of tail); thorns in central median row fewer and smaller than in rows adjacent; 80-82 total pectoral radials; 26-31 trunk centra; 79-85 predorsal centra; 133-138 total centra; 61-76 tooth rows in upper jaw. Colouration: brownish and white spotted, with large dark pectoral spots bordered with smaller white spots when fresh; rostral cartilage is demarcated from rest of snout; ventral surface whitish with outer margins of pectoral fins yellowish; ventral sensory pores are minute, indistinct, not black-edged or surrounded by greyish blotches; dorsal fins are dark anteriorly, paler posteriorly; the caudal fin pale or brownish (Ref. 112881).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Last, P.R. and A.P.K. Lim, 2010. A new species of skate Okamejei jensenae sp. nov. (Rajoidei: Rajidae) from the seas off Borneo, with a redescription of the Kwangtung skate, Dipturus kwangtungensis. pp. 101-114. In Last, P.R., White, W.T. & Pogonoski, J.J. (eds.): Descriptions of new sharks and rays from Borneo. CSIRO Marine and Atmospheric Research Paper no. 32. (Ref. 84287)
IUCN Red List Status (Ref. 120744)
CITES (Ref. 118484)
Threat to humans
Common namesSynonymsMetabolismPredatorsEcotoxicologyReproductionMaturitySpawningSpawning aggregationFecundityEggsEgg development
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates based on models
Preferred temperature (Ref. 115969
): 20.1 - 21.8, mean 20.4 (based on 3 cells).
Phylogenetic diversity index (Ref. 82805
= 0.7500 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00575 (0.00280 - 0.01185), b=3.13 (2.94 - 3.32), in cm Total Length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.7 ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 120179
): Low, minimum population doubling time 4.5 - 14 years ().
Vulnerability (Ref. 59153
): Moderate vulnerability (38 of 100) .