Elasmobranchi (squali e razze) (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.
Ambiente: milieu / zona climatica / distribuzione batimetrica / gamma di distribuzione
Ecologia
marino; salmastro benthopelagico; distribuzione batimetrica 5 - 47 m (Ref. 91774), usually 5 - 15 m (Ref. 91774). Subtropical
Southwest Atlantic: Brazil to Argentina.
Dimensione / Peso / Età
Maturità: Lm ?  range ? - ? cm
Max length : 63.0 cm WD maschio/sesso non determinato; (Ref. 91774); 70.0 cm WD (female)
Breve descrizione
Chiavi di identificazione | Morfologia | Morfometria
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).
Body shape (shape guide): other (see remarks); Cross section: flattened.
Male and female mature at approximately 50.0-60.0 mm DW (Ruocco, unpubl. data), and males are typically smaller than females (Ref. 91774).
Ciclo vitale e comportamento di accoppiamento
Maturità | Riproduzione | Deposizione | Uova | Fecondità | Larve
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)
Stato della Lista Rossa IUCN (Ref. 130435: Version 2025-2 (Global))
Minaccia per l'uomo
Harmless
Usi umani
Strumenti
Rapporti speciali
Scarica XML
Fonti Internet
Stime basate su modelli
Temperatura preferita (Fonte Biblio.
123201): 13.3 - 23.6, mean 16.3 °C (based on 199 cells).
Indice di diversità filogenetica (Fonte Biblio.
82804): PD
50 = 0.5002 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00389 (0.00124 - 0.01219), b=3.08 (2.83 - 3.33), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
Livello trofico (Fonte Biblio.
69278): 3.4 ±0.4 se; based on size and trophs of closest relatives
Resilienza (Fonte Biblio.
120179): Basso, tempo minimo di raddoppiamento della popolazione 4.5 - 14 anni (Preliminary low fecundity).
Vulnerabilità della pesca (Ref.
59153): Very high vulnerability (83 of 100).
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