分类 / Names
俗名 | 同种异名 | Catalog of Fishes(属, 种) | ITIS | CoL | WoRMS | Cloffa
Elasmobranchii 板鳃亚纲 (鲨鱼与 鱼) (sharks and rays)
(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
海洋; 半咸淡水 底中水层性; 深度上下限 5 - 47 m (Ref. 91774), usually 5 - 15 m (Ref. 91774).
国家 | FAO区域 | 生态系 | 标本纪录 | Point map | 简介 | Faunafri
Southwest Atlantic: Brazil to Argentina.
大小 / 重量 / 年龄
Maturity: Lm ?  range ? - ? cm
Max length : 63.0 cm WD 雄鱼/尚未辨别雌雄; (Ref. 91774); 70.0 cm WD (female)
型态特徵 | 形态测量图
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).
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
成熟度 | 繁殖 | 产卵场 | 卵 | 孕卵数 | 仔鱼
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)
合作者照片Stamps, Coins Misc.声音神经毒速度泳型鳃区Otoliths脑重体重比眼睛色素
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
= 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 BS (Ref. 93245
营养阶层 (Ref. 69278
): 3.5 ±0.4 se; based on size and trophs of closest relatives
回复力 (Ref. 120179
): 低的, 最小族群倍增时间4.5 - 14 年 (Preliminary low fecundity).
Fishing Vulnerability (Ref. 59153
): Very high vulnerability (83 of 100).