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The bizarre Lessiniabatis of Early Eocene Italy. Permineralized stingray teeth have been found in sedimentary deposits around the world as far back as the Early Cretaceous.The oldest known stingray taxon is "Dasyatis" speetonensis from the Hauterivian of England, whose teeth most closely resemble that of the extant sixgill stingray (Hexatrygon).
Female round stingrays emit a localized positive electric field from near the spiracles behind each eye, which serves to attract males. The males will bite at the area, with successful contact necessary for copulation. [6] Round stingrays grow at 3 cm per year until they reach maturity at around 31 months, at which time their growth rate slows. [2]
Like other stingrays, reproduction in this species is ovoviviparous, with the embryos sustained in late development by histotroph ("uterine milk") delivered via specialized structures. The females giving birth to live young measuring 18 cm (7.1 in) across or more. [2]
The giant freshwater stingray (Urogymnus polylepis, also widely known by the junior synonym Himantura chaophraya) is a species of stingray in the family Dasyatidae.It is found in large rivers and estuaries in Southeast Asia and Borneo, though historically it may have been more widely distributed in South and Southeast Asia.
For over a hundred million years, the stingray has roamed the world's oceans as an almost mythological animal: extraordinarily graceful, yet potentially lethal.
Stingrays, which can injure hundreds of people in a single area each year, could be a familiar culprit for a shallow-water beach injury that may require a hospital visit.
A female bluntnose stingray with three embryos; this species gives birth to live young. The bluntnose stingray has generally nocturnal habits and spends much of the day buried in the substrate. [10] [14] It has been known to follow the rising tide to forage in water barely deep enough to cover its body. [15]
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