Rioraja agassizii

(Müller & Henle, 1841)

Rio skate
Classification: Elasmobranchii Rajiformes Arhynchobatidae

Reference of the original description
Müller, J. & Henle, F.G.J. (1841)
Systematische Beschreibung der Plagiostomen. Berlin, Veit, pp. 1–200

Image of the original description

Rioraja agassizi (Müller & Henle, 1841)

Synonyms / new combinations and misspellings
Raja agassizi, Raja agassizii, Raja (Rioraja) agassizi, Raja (Uraptera) agassizi, Rioraja agassizi, Uraptera agassizii

Rioraja agassizii

Rioraja agassizi
Syntype: MNHN: ? MNHN: 2430; ZMB: 4619

Description :

Citation: Rioraja agassizii (Müller & Henle, 1841): In: Database of modern sharks, rays and chimaeras,, World Wide Web electronic publication, Version 07/2024

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Rioraja agassizii (Müller & Henle, 1841), Size (cm): 33.8 WD, male, Brazil, Macaé, Rio de Janeiro © Marcelo Vianna, Laboratório de Biologia e Tecnologia Pesqueira, Universidade Federal do Rio de Janeiro
Common names
spa Raya lisa, eng Ray, eng Rio skate, por Arraia-santa, por Raia-santa, por Skate

Short Description
Diet: southeastern Brazil (data base: 258 specimens, TL between 96 and 532 mm, sex: 57.85% females, 42.15% male): Nine prey categories were identified: Polychaeta, Copepoda, Cumacea, Isopoda, Gammaridea, Dendrobranchiata, Brachyura, Teleostei, and one non-animal category (nonidentifiable items). Crustaceans were the most important item, indicating that the species has a carcinophagic preference. The presence of fish was just verified in juveniles and some adult individuals, with predominance in summer. Sex, maturity stage and seasonality did not influence the feeding habits of the species. [14289]

Southwest Atlantic: Espírito Santo, Brazil to Argentina. Source:

Oviparous, paired eggs are laid. Embryos feed solely on yolk [733]. A coastal species found on sand, mud or gravel bottoms. Feeds on crustaceans, mollusks and fishes.

Size / Weight / Age
33.0 cm WD (male/unsexed; [20080])

demersal; marine; depth range ? - 130 m [20079]

shark-references Species-ID=7852;

Parasites (arranged by Jürgen Pollerspöck)
  • Chloromyxum riorajum Azevedo, Casal, Garcia, Matos, Teles-Grilo & Matos, 2009 [9088] [26747]

  • Metanisakis sulamericana (Santos, Lent & Gibson, 2004) [21220] [31368]
  • Pseudanisakis sulameri Santos, Lent & Gibson, 2004 [7387]

  • Brianella corniger Wilson, 1915 [24671]