Fontitrygon garouaensis
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| Fontitrygon garouaensis | ||||||||||||
| ( Stauch & Blanc , 1962) |
Fontitrygon garouaensis is a species of stingray and livesin brackish and fresh watersin Nigeria and Cameroon . So far it hasbeen detectedin the Benue , in Niger south of the Benu estuary, in the Lagoon of Lagos and in the Cross River .
features
Fontitrygon garouaensis has an almost circular, thin pectoral fin disc with a slightly protruding tip of the snout, and reaches a disc width of 40 centimeters. The tail is like a whip, about twice as long as the disc and has a long, poisonous sting for the small body size. The top is gray or brown, lighter on the edges, the bottom is white.
Way of life
The ray feeds almost exclusively on the nymphs of the mayfly , stonefly and caddis fly , rarely also on two-winged birds . It becomes sexually mature at the age of two, males reach five, females seven years. He is ovoviviparous .
It is occasionally brought in as by-catch and sold fresh or smoked. In its ancestral habitat in the Niger river system , the population is declining, presumably due to increasing droughts. It is also widespread in the Sanaga , but the exact population figures there are not known. The IUCN rates its status as VU (endangered).
Systematics
The ray species was described in 1962 under the scientific name Potamotrygon colarensis , later assigned to the genus Dasyatis . When the Dasyatidae was revised in mid-2016 , the species was placed in the newly introduced genus Fontitrygon .
Individual evidence
- ↑ Last, PR, Naylor, GJP & Manjaji-Matsumoto, BM (2016): A revised classification of the family Dasyatidae (Chondrichthyes: Myliobatiformes) based on new morphological and molecular insights. Zootaxa , 4139 (3): 345-368. doi: 10.11646 / zootaxa.4139.3.2
Web links
- Fontitrygon garouaensis on Fishbase.org (English)
- Fontitrygon garouaensis on the IUCN Red List