Myliobatis ridens Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani, 2012
Shortnose eagle ray
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Family:  Myliobatidae (Eagle and manta rays)
Max. size:  63 cm WD (male/unsexed); 70 cm WD (female)
Environment:  benthopelagic; brackish; marine; depth range 5 - 47 m
Distribution:  Southwest Atlantic: Brazil to Argentina.
Diagnosis:  This species is distinguished by the following set of characters: rhombic disc which is wider than long, width about 2.2-times TL; disc length 58%-64% of DW; anterior margin of disc joining head behind orbits; head clearly protruding from disc, eyes in lateral position, moderate in size; snout width equal to interorbital distance (13.6%-16.5% DW), mouth relatively wide, as broad as distance between 5th gill slits (mouth width 0.8-1-times distance between 5th gill slits); mouth width greater than distance between inner ends of nostrils (1.5-1.6- times); distance between 5th gill slits greater than distance between inner ends of nostrils (1.8-1.6-times) (Ref. 91774).
Biology:  Male and female mature at approximately 50.0-60.0 mm DW (Ruocco, unpubl. data), and males are typically smaller than females (Ref. 91774).
IUCN Red List Status: Critically Endangered (CR); Date assessed: 01 July 2019 (A2bd) Ref. (124695)
Threat to humans:  harmless
Country info:   

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