Discopyge tschudii

HECKEL, 1846


Apron ray
Classification: Elasmobranchii Torpediniformes Narcinidae

Reference of the original description
VON TSCHUDI, J.J. (1846)
Ichthyologie. In: Untersuchungen über die Fauna Peruana. Scheitlin & Zollikofer, St. Gallen. 1844–46, in 12 parts. Untersuchungen über die Fauna Peruana: ii–xxx + 1–35, Pls. 1–6

Synonyms / new combinations and misspellings
Discopyge tschuddi, Discopyge tschudi, Torpedo chilensis

Types
Discopyge tschudii



Description :


Citation: Discopyge tschudii HECKEL, 1846: In: Database of modern sharks, rays and chimaeras, www.shark-references.com, World Wide Web electronic publication, Version 04/2019

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Discopyge tschudii HECKEL, 1846, collection of chondrichthyans of Julio Lamilla's Laboratory of Elasmobranchs at the Austral University of Chile © Sebastian Kraft, Instituto de Ecología y Biodiversidad (IEB), Universidad de Chile
Common names
spa Raja elcectric, spa Raya eléctrica, spa Tembladera, spa Tremolina, eng Apron ray, eng Electric ray

Short Description
Diet: off Uruguay and northern Argentina (data base: 176 stomachs were obtained): Discopyge tschudii preys mainly on polychaetes (88.77% index of relative importance (IRI)) followed by siphons of the clam Amiantis purpurata (8.13% IRI) and amphipods (3.08% IRI). Ontogenetic, sexual and seasonal changes were found. Larger individuals of D. tschudii consumed buried polychaetes more often. The consumption of errant polychaetes was higher in males and in the cold season. Also, amphipods were preyed on more heavily by females and the number of siphons of A. purpurata consumed was higher in the cold season.

Distribution
Southeast Pacific: Peru and Chile [455]. Southwest Atlantic: Uruguay and Argentina [17204]; San Matías Gulf, Northern Patagonia, Argentina [15175], Source: www.gbif.org

Biology
San Matías Gulf, Northern Patagonia, Argentina (data basis: 1087 individuals): A total of 199 embryos were sampled and the proportion of sexes showed no significant differences from the expected 1:1. The number of embryos per female varied from 1 to 12. The most frequent values were 2 and 5. Length at birth was estimated at 82.17 ± 3.87 mm. Based on our findings, we hypothesize that the electric ray D. tschudii completes its reproductive cycle in San Matías Gulf, Northern Patagonia, Argentina [15175]. Subtropical

Size / Weight / Age
Max length : 53.8 cm TL male/unsexed; [3705]; 44.2 cm TL (female); San Matías Gulf, Northern Patagonia, Argentina (data basis: 1087 individuals): Males ranged from 9 to 43 cm and females from 11 to 38 cm. The species presented sexual dimorphism. Males were larger and heavier than females and also matured at larger sizes. Size at 50% of maturity was estimated at 30 cm for males and 21 cm for females [15175].

Habitat
Demersal; marine; depth range 5 - 165 m [3705]

Remarks
shark-references Species-ID=2043;

Parasites (arranged by Jürgen Pollerspöck)
Cestoda
  • Acanthobothrium stefaniae FRANZESE & IVANOV, 2018 [26364]
  • Phyllobothrium discopygi CAMPBELL & CARVAJAL, 1987 [16286] [25154]

Nematoda
  • Proleptus carvajali FERNANDEZ & VILLALBA, 1985 [19883]