Elasmobranchii (sharks and rays) > Myliobatiformes
(Stingrays) > Dasyatidae
Etymology: Dasyatis: Greek, dasys = rough, dense (Ref. 45335).
Genus allocation could be Dasyatis and should be checked (B. Séret, pers. comm., 2009).
Environment / Climate / Range
Freshwater; brackish; demersal. Tropical
Size / Weight / Age
Maturity: Lm ?  range ? - ? cm
Max length : 65.0 cm TL male/unsexed; (Ref. 3497)
Morphology | Morphometrics
soft rays: 0. A very large and thick-bodied freshwater dasyatid. Disc oval, very thick, medial lobe narrow-based and short, its anterior margin broadly convex; entire dorsal surface of disc covered with stout-spined denticles (smooth in newborn); sting greatly reduced in size or absent; total pectoral radials 142-148 (Ref. 26277). Total tooth rows 38-40/38-48 (Ref. 7397). Disc and pelvic fins dark brown or gray-brown above, without spots or prominent markings, white below except for broad dark margins; tail blackish except for underside of its base (Ref. 26277).
Africa: Nigeria, Gabon and Congo.
In rivers and lakes of West Africa. Ovoviviparous (Ref. 50449).
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).
Compagno, L.J.V., 1999. Checklist of living elasmobranchs. p. 471-498. In W.C. Hamlett (ed.) Sharks, skates, and rays: the biology of elasmobranch fishes. John Hopkins University Press, Maryland. (Ref. 35766)
IUCN Red List Status (Ref. 96402)
CITES (Ref. 94142)
Threat to humans
ReferencesAquacultureAquaculture profileStrainsGeneticsAllele frequenciesHeritabilityDiseasesProcessingMass conversion
Estimates of some properties based on models
Phylogenetic diversity index (Ref. 82805
= 0.5000 [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 ±0.6 se; Based on size and trophs of closest relatives
Resilience (Ref. 69278
): Very Low, minimum population doubling time more than 14 years (Assuming Fec<10).
Vulnerability (Ref. 59153
): Low to moderate vulnerability (30 of 100) .