Hypanus say
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Hypanus say |
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| ( Lesueur , 1817) |
Hypanus say is a species of stingray and lives in shallow water off the coast of the western Atlantic between New Jersey (rarely also north to Massachusetts ) and Venezuela . Stingrayssightedon the coasts of Uruguay and northern Argentina could be this species or Hypanus americanus .
features
Hypanus say has a diamond-shaped pectoral fin disc that is slightly wider than it is long, rounded on the sides and tapering off at the snout at a flat angle. It reaches a body length of 100 cm and a width of 78 cm, with females becoming larger than males. The tail is whip-like, a good one and a half times as long as the disc, and has a well-developed fold on the top and bottom. It has a poison sting or two on the top of its tail. The top of the disc is gray-brown, red-brown or green-brown, sometimes with bluish spots. There are some tubercles and spines on the midline of the top. The underside is whitish, occasionally with darker spots or a darker disc edge.
Way of life
The ray lives in bays, lagoons and estuaries close to the ground at depths between 1 and 10 m. At night he hunts crustaceans , annelids , clams , snails and bony fish . During the day it usually burrows in the ground. It is ovoviviparous and mates between April and June. Only in the following spring, after a gestation period of 11 to 12 months, the females give birth to two to four cubs, 15 to 16 cm long at birth. In the uterus, the embryos first feed on the egg yolk, then on a slimy fluid that is secreted from the uterus and enriched with fat and proteins.
Systematics
The ray species was described in 1817 by the French naturalist Charles-Alexandre Lesueur under the scientific name Raja say , later assigned to the genus Dasyatis . When the Dasyatidae was revised in mid-2016 , the species was placed in the genus Hypanus .
literature
- Kent E. Carpenter: The Living Marine Resources of the Western Central Atlantic. Volume 1: Introduction, molluscs, crustaceans, hagfishes, sharks, batoid fishes and chimaeras. FAO Species Identification Guide for Fishery Purposes and American Society of Ichthyologists and Herpetologists, Special Publication No. 5, Rome, FAO, 2002. ISBN 92-5-104825-8 , page 570.
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
- Hypanus say on Fishbase.org (English)
- Hypanus say on the IUCN Red List