Myliobatis ridens, Shortnose eagle ray

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Myliobatis ridens Ruocco, Lucifora, Díaz de Astarloa, Mabragaña & Delpiani, 2012

Shortnose eagle ray
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Myliobatis ridens   AquaMaps   Data sources: GBIF OBIS
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Image of Myliobatis ridens (Shortnose eagle ray)
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drawing shows typical species in Myliobatidae.

Classification / Names Common names | Synonyms | Catalog of Fishes(genus, species) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii (sharks and rays) > Myliobatiformes (Stingrays) > Myliobatidae (Eagle and manta rays)
Etymology: Myliobatis: Greek, mylo = mill + Greek, + Greek, batis,-idos = a ray (Raja sp.) (Ref. 45335);  ridens: Name from Latin 'ridens' meaning laughing or smiling, referring to the peculiar countenance of this species caused by the corners and width of the mouth that resembles a smile..

Environment: milieu / climate zone / depth range / distribution range Ecology

Marine; brackish; benthopelagic; depth range 5 - 47 m (Ref. 91774), usually 5 - 15 m (Ref. 91774). Subtropical

Distribution Countries | FAO areas | Ecosystems | Occurrences | Point map | Introductions | Faunafri

Southwest Atlantic: Brazil to Argentina.

Size / Weight / Age

Maturity: Lm ?  range ? - ? cm
Max length : 63.0 cm WD male/unsexed; (Ref. 91774); 70.0 cm WD (female)

Short description Morphology | Morphometrics

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     Glossary (e.g. epibenthic)

Male and female mature at approximately 50.0-60.0 mm DW (Ruocco, unpubl. data), and males are typically smaller than females (Ref. 91774).

Life cycle and mating behavior Maturity | Reproduction | Spawning | Eggs | Fecundity | Larvae

Main reference Upload your references | References | Coordinator : McEachran, John | Collaborators

Ruocco, N.L., L.O. Lucifora, J.M.D. de Astarloa, E. Mabragaña and S.M. Delpiani, 2012. Morphology and DNA barcoding reveal a new species of Eagle Ray from the Southwestern Atlantic: Myliobatis ridens sp. nov. (Chondrichthyes: Myliobatiformes: Myliobatidae). Zoological Studies 51(6): xxx-xxx. Two (Ref. 91774)

IUCN Red List Status (Ref. 130435)

  Critically Endangered (CR) (A2bd); Date assessed: 01 July 2019

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

Threat to humans

  Harmless





Human uses

FAO - Publication: search | FishSource |

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Internet sources

AFORO (otoliths) | Aquatic Commons | BHL | Cloffa | BOLDSystems | Websites from users | Check FishWatcher | CISTI | Catalog of Fishes: genus, species | DiscoverLife | ECOTOX | FAO - Publication: search | Faunafri | Fishipedia | Fishtrace | GenBank: genome, nucleotide | GloBI | Google Books | Google Scholar | Google | IGFA World Record | MitoFish | National databases | Otolith Atlas of Taiwan Fishes | PubMed | Reef Life Survey | Socotra Atlas | Tree of Life | Wikipedia: Go, Search | World Records Freshwater Fishing | Zoobank | Zoological Record

Estimates based on models

Preferred temperature (Ref. 123201): 13.3 - 23.6, mean 16.3 °C (based on 199 cells).
Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5002   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01000 (0.00244 - 0.04107), b=3.04 (2.81 - 3.27), in cm total length, based on all LWR estimates for this body shape (Ref. 93245).
Trophic level (Ref. 69278):  3.5   ±0.4 se; based on size and trophs of closest relatives
Resilience (Ref. 120179):  Low, minimum population doubling time 4.5 - 14 years (Preliminary low fecundity).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (83 of 100).