Bathytoshia brevicaudata
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Bathytoshia brevicaudata |
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| Bathytoshia brevicaudata | ||||||||||||
| ( Hutton , 1875) |
Bathytoshia brevicaudata is the largest known stingray species and lives on the continental shelf off South Africa , Mozambique and India, as well as on the temperate and subtropical coasts of Australia and New Zealand .
features
Bathytoshia brevicaudata can reach a total length of up to 4.30 meters with a disc diameter of 2.10 meters and a weight of 350 kg, but usually only remains at a total length of 1.25 meters. The top is smooth and gray-brown or blue-gray with small light blue spots on the pectoral fins. The underside is white. The tail has a thick base and is shorter than the body disc in older animals, and longer in young animals. It usually has two poison stings on its tail. In front of the spines is a row of thick, long thorns.
Way of life
The rays mostly live on sandy or muddy bottom of very shallow water to depths of up to a maximum of 470 meters (usually only up to 200 meters) and feed on crustaceans , mussels , poly-bristles and sea eels . The species is relatively gregarious. She is described by divers as curious and not aggressive. Like all stingrays, the species is ovoviviparous . In the uterus, the embryos feed on the egg yolk, then on a slimy fluid that is excreted by the uterus and enriched with fat and proteins. At birth, the young have a body disc diameter of about 36 cm.
Systematics
The ray species was described in 1875 by the English zoologist Frederick Wollaston Hutton under the scientific name Trygon brevicaudata , later assigned to the genus Dasyatis . When the Dasyatidae were revised in mid-2016 , the species was placed in the genus Bathytoshia . Dasyatis matsubarai is another synonym of Bathytoshia brevicaudata .
literature
- Kent E. Carpenter & Volker H. Niem: The Living Marine Resources of the Western Central Pacific. Volume 3. Batoid fishes, chimaeras and Bony fishes part 1 (Elopidae to Linophrynidae). Rome, FAO. 1998, ISBN 92-5-104302-7 , page 1499.
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
- Dasyatis brevicaudata on Fishbase.org (English)
- Dasyatis brevicaudata on the IUCN Red List