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Fontitrygon garouaensis (Stauch & Blanc, 1962)

Smooth freshwater stingray
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Fontitrygon garouaensis
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分類 / Names 俗名 | 同種異名 | Catalog of Fishes(屬, 種) | ITIS | CoL | WoRMS | Cloffa

Elasmobranchii 板鰓亞綱 (鯊魚與魟魚) (sharks and rays) > Myliobatiformes (Stingrays) 鰩目 (Stingrays) > Dasyatidae (Stingrays) 土魟科 (Stingrays) > Urogymninae
Etymology: garouaensis: Named for its geographical localization (Ref. 39828).

Environment: milieu / climate zone / depth range / distribution range 生態學

; 淡水 居於水底的. 熱帶

分布 國家 | FAO區域 | 生態系 | 發現紀錄 | Point map | 簡介 | Faunafri

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 / 年齡

Maturity: Lm ?  range ? - ? cm
Max length : 40.0 cm WD 雄魚/尚未辨別雌雄; (Ref. 3497)

簡短描述 檢索表 | 型態特徵 | 形態測量圖

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).
一個普通大而細瘦的淡水土魟; 體盤橢圓形，比任何其他的西非土魟扁平, 它的深度只有 8.7-11.0% 的體盤寬度; 細齒在體盤背面上高變異的,有時不存在, 總是侷限於中央的部分; 珍珠棘不存在或呈現出 2-3個低的細齒.(參考文獻 26277) 吻尖突出的作為一個小的三角形的突起.(參考文獻 31256) 在上頜中的 16-18個齒, 在下頜中的 14-28個齒.(參考文獻 31256) 體盤與腹鰭中等的灰色或灰褐色上方, 沒有斑點或者突出的斑紋, 腹面白色的而且沒有深色的邊緣; 尾部比較深色或黑色的, 腹面顏色較淡.(參考文獻 26277)

生物學特性     字彙 (例如 epibenthic)

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.(參考文獻 50449)

Life cycle and mating behavior 成熟度 | 繁殖 | 產卵場 | 卵 | 孕卵數 | 仔魚

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)

主要參考資料 Upload your references | 參考文獻 | 合作者 : McEachran, John | 合作者

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)

IUCN 瀕危狀態 (Ref. 130435: Version 2024-1)

  極危 (CR) (A2cd); Date assessed: 04 August 2020

CITES

Not Evaluated

CMS (Ref. 116361)

Not Evaluated

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Estimates based on models

Phylogenetic diversity index (Ref. 82804):  PD50 = 0.5156   [Uniqueness, from 0.5 = low to 2.0 = high].
Bayesian length-weight: a=0.01023 (0.00486 - 0.02155), b=3.06 (2.87 - 3.25), in cm total length, based on LWR estimates for this (Sub)family-body shape (Ref. 93245).
營養階層 (Ref. 69278):  3.7   ±0.3 se; based on size and trophs of closest relatives
回復力 (Ref. 120179):  非常低的, 最小族群倍增時間超過14 年 (Assuming Fec<10).
Fishing Vulnerability (Ref. 59153):  Very high vulnerability (90 of 100).