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) >
Myliobatiformes (Stingrays) >
Dasyatidae (Stingrays) > Urogymninae
Etymology: garouaensis: Named for its geographical localization (Ref. 39828).
Environment: milieu / climate zone / depth range / distribution range
生态学
; 淡水 居于水底的. 熱帶
Africa: Benue River in Cameroon and Nigeria, and Niger River downstream from its confluence with the Benue River (Ref. 3497, 81259). Also reported from Lagos Lagoon, Cross River and Sanaga River (Ref. 81259, 81625).
非洲: 在喀麥隆與奈及利亞的貝努埃河 , 與從尼日河與貝努埃河的匯流處順流而下。 這種的標本曾經從在 Mamfe 附近的拉哥斯 潟湖與從十字河鑑定。 (參考文獻 3497)
大小 / 重量 / 年龄
Maturity: Lm ? range ? - ? cm
Max length : 40.0 cm WD 雄鱼/尚未辨别雌雄; (Ref. 3497)
简单描述
检索表 | 型态特徵 | 形态测量图
脊椎骨: 120 - 131. Diagnosis: A moderately large and thin-bodied freshwater dasyatid; disc flatter than in any other West African dasyatid, its depth only 8.7-11.0% of disc width vs. 11.0% or more in other species; denticles on dorsal surface of disc highly variable, sometimes absent, always restricted to central portion; pearl spine absent or represented by 2-3 low denticles (Ref. 26277). It is most similar to the small marine species Dasyatis margaritella and the larger marine species Dasyatis margarita, both of which have well-developed pearl spines and shorter snouts (Ref. 26277).
一个普通大而细瘦的淡水土 ; 体盘椭圆形，比任何其他的西非土 扁平, 它的深度只有 8.7-11.0% 的体盘宽度; 细齿在体盘背面上高变异的,有时不存在, 总是局限于中央的部分; 珍珠棘不存在或呈现出 2-3个低的细齿.(参考文献 26277) 吻尖突出的作为一个小的三角形的突起.(参考文献 31256) 在上颌中的 16-18个齿, 在下颌中的 14-28个齿.(参考文献 31256) 体盘与腹鳍中等的灰色或灰褐色上方, 没有斑点或者突出的斑纹, 腹面白色的而且没有深色的边缘; 尾部比较深色或黑色的, 腹面颜色较淡.(参考文献 26277)
Dasyatis garouaensis is restricted to fresh waters (Ref. 81625). Its conservation status is uncertain, given its restricted distribution in a region with known habitat degradation; this species has apparently become less common after the construction of a dam on the Benue River (Ref. 81625). Ovoviviparous (Ref. 50449).
卵胎生的.(参考文献 50449)
Life cycle and mating behavior
Maturities | 繁殖 | Spawnings | Egg(s) | Fecundities | 仔鱼
Exhibit ovoviparity (aplacental viviparity), with embryos feeding initially on yolk, then receiving additional nourishment from the mother by indirect absorption of uterine fluid enriched with mucus, fat or protein through specialised structures (Ref. 50449). Distinct pairing with embrace (Ref. 205).非洲: 在喀麥隆與奈及利亞的貝努埃河 , 與從尼日河與貝努埃河的匯流處順流而下。 這種的標本曾經從在 Mamfe 附近的拉哥斯 潟湖與從十字河鑑定。 (參考文獻 3497)
Compagno, L.J.V. and T.R. Roberts, 1984. Dasyatidae. p. 4-5. In J. Daget, J.P. Gosse and D.F.E. Thys van den Audenaerde (eds.) Check-list of the freshwater fishes of Africa (CLOFFA). ORSTOM, Paris and MRAC, Tervuren. Vol. 1. (Ref. 3497)
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Estimates based on models
Phylogenetic diversity index (Ref.
82804): PD
50 = 0.5156 [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.00832 (0.00366 - 0.01891), b=3.10 (2.90 - 3.30), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref.
93245).
营养阶层 (Ref.
69278): 3.7 ±0.3 se; based on size and trophs of closest relatives
回复力 (Ref.
120179): 非常低的, 最小族群倍增时间超过14 年 (Assuming Fec<10).
Fishing Vulnerability (Ref.
59153): Very high vulnerability (90 of 100).
