Hypanus marianae

from Wikipedia, the free encyclopedia
Hypanus marianae
Systematics
Subclass : Plate gill (Elasmobranchii)
without rank: Stingray (batoidea)
Order : Myliobatiformes
Family : Stingrays (Dasyatidae)
Genre : Hypanus
Type : Hypanus marianae
Scientific name
Hypanus marianae
( Gomes , Rosa & Gadig , 2000)

Hypanus marianae is a stingray species and lives exclusively off the coasts of northeast Brazil .

features

Hypanus marianae has a diamond-shaped pectoral fin disc that is about as wide as it is long and reaches widths of up to 40 cm. The side of the disc is rounded, the front sides are slightly concave and the snout protrudes only a little. The eyes are large, followed by injection holes of roughly the same size. The tail is one and a half times as long as the disk is wide, tapers towards the tip and has a poison sting at the top. The color of the upper side of the disc is golden brown with dark brown spots and a narrow blue border followed by a brown band. The underside is white, darker towards the edges and bears a pair of kidney-shaped, dark brown spots next to the gill slits and pairs of lighter spots adjoining them to the rear. The tail is dark brown above and white below with blue stripes on the sides, the tip dark red.

Way of life

The ray lives along the northeast coast of Brazil between Maranhão and Bahia in coral and sandstone reefs at depths between 2 and 15 m. Young animals can also be found near the beach and at river mouths. It is ovoviviparous with litters from a single young that is born in shallow water with a disc width of 13 to 14 cm in June or between November and December.

It is harmless to humans and is cautious about divers. It is often brought in in small quantities by local coastal fishermen and some are also caught for sale as ornamental fish. The impact of fishing on the number of stocks is unknown. It is also threatened by human impacts on the reefs of its habitat, but there are also several Brazilian marine protected areas - such as the Parque Estadual do Parcel Manuel Luiz in the north and the Parque Nacional Marinho dos Abrolho in the south - available as a retreat. Since there is too little information on the stock and catch figures, the IUCN assesses the endangered status as DD (data deficit).

Systematics

The ray species was first described under the scientific name Dasyatis guttata in 2000 . When the Dasyatidae was revised in mid-2016 , the species was placed in the genus Hypanus .

Individual evidence

  1. 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