Potamotrygon magdalenae

(Duméril, 1865)


Magdalena river stingray
Classification: Elasmobranchii Myliobatiformes Potamotrygonidae

Reference of the original description
Dumeril, A.H.A. (1865)
Histoire naturelle des poissons ou ichthyologie générale. Tome Premier. Elasmobranchés. Plagiostomes et Holocéphales ou Chimères. Librairie Encyclopédique de Roret, Paris. 720 pp

Image of the original description
No image in first description.

Synonyms / new combinations and misspellings
Taeniura magdalenae

Types
Potamotrygon magdalenae
Holotype: MNHN: A-2368;


Description :


Citation: Potamotrygon magdalenae (Duméril, 1865): In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 12/2021

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Taeniura magdalenae (in Steindacher, 1878) valid as: Potamotrygon magdalenae (DUMÉRIL, 1865)
Common names
spa Raya, spa Raya de rio, eng Magdalena river stingray

Distribution
South America: Magdalena and Atrato River basins. Source: www.gbif.org

Biology
Prefers shallow muddy bottoms with turbid waters. Feeding analysis: Specimens: n=74 (7.50 to 22.25 cm DW, 41 females, 30 males, three individuals of unidentified sex, 59 individuals were juveniles, 12 were adults), Magdalena River, Columbia: three (4.05%) stomachs were empty, and a total of 45 food components (prey items) were identified.
The most frequent prey categories were Diptera (76.0%) and Trichoptera (23.9%). Chironomidae larvae and Ceratopogonidae larvae were the most frequent prey items (64.8% and 43.6%, respectively). Unidentified insect parts also showed a high frequency in the diet of P. magdalenae (50.7%). The most important prey categories according to prey-specific abundance by number (%PN) were Bivalvia and Diptera larvae (53.6% and 50.6%, respectively) and by mass (%PM) were Bivalvia and Oligochaeta (99.7% and 45.8%, respectively). Unidentified insect parts had a significant value for both indices (77.7% and 72.5%) [27396].

Size / Weight / Age
35.0 cm WD (male/unsexed; (Ref. 36687))

Habitat
benthopelagic; freshwater

Remarks
shark-references Species-ID=4955;

Parasites (arranged by Jürgen Pollerspöck)
Cestoda
Trematoda
  • Paravitellotrema overstreeti Brooks, Mayes & Thorson, 1979 [16922]