Elasmobranchii (sharks and rays) > Myliobatiformes
(Stingrays) > Dasyatidae
Etymology: Urogymnus: Greek, oura = tail + Greek, gymnos = naked (Ref. 45335).
Environment / Climate / Range
Marine; brackish; reef-associated; depth range ? - 130 m (Ref. 90102). Tropical; 31°N - 31°S, 20°W - 177°W
Length at first maturity / Size / Weight / Age
Maturity: Lm ?, range 100 - ? cm
Max length : 147 cm WD male/unsexed; (Ref. 58048)
soft rays: 0. 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). Very thick elongated disc with broadly rounded outer corners; snout broadly rounded and tail slender, about as long as body and without finfolds (Ref. 5578). Light grey or whitish dorsally, white ventrally; tail blackish (Ref. 5578).
Indo-Pacific: Red Sea and coast of East Africa to the Marshall Islands and Fiji, south to northern Australia (Ref. 2334). Eastern Atlantic: Senegal, Guinea, and Côte d'Ivoire (Ref. 4438).
Inhabits the continental shelf area. Found on sand and coral rubble areas near reefs (Ref. 9840), often in caves. Ovoviviparous (Ref. 50449). Due to its difficult handling, it is probably of limited commercial value (Ref. 9840). Its thorn can inflict a painful injury. Caught commonly by demersal tangle net fisheries. Utilized for its meat, skin (very high value) and cartilage (Ref.58048).
Life cycle and mating behavior
Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae
Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449). Distinct pairing with embrace (Ref. 205). Distinct pairing with embrace (Ref. 205).
Randall, J.E., G.R. Allen and R.C. Steene, 1990. Fishes of the Great Barrier Reef and Coral Sea. University of Hawaii Press, Honolulu, Hawaii. 506 p. (Ref. 2334)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
Traumatogenic (Ref. 2334)
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 1.0000 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01202 (0.00492 - 0.02938), b=3.03 (2.81 - 3.25), based on LWR estimates for this (Sub)Family-body shape (Ref. 93245
Trophic Level (Ref. 69278
): 3.5 ±0.46 se; Based on food items.
Resilience (Ref. 69278
): Low, minimum population doubling time 4.5 - 14 years (Assuming fecundity<100).
Vulnerability (Ref. 59153
): Very high vulnerability (90 of 100) .