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AnimalsEndangered SpeciesScience

New Species Of Whipray Identified By DNA Research

An entirely new species of Whipray from the Himantura genus has now been identified completely through the means of DNA testing, not simply morphological criteria, as part of new research that was done by Institut de Recherche pour le Développement (IRD).

"Biologists have discovered a new species of whipray that they call Himantura tutul, which belongs to a genetic line that is totally distinct from the three other species that are known in the same group: H. leoparda, H. uarnak and H. undulata. They frequent the same costal habitats but occupy different ecological niches." Image Credit: © IRD / P. Laboute
“Biologists have discovered a new species of whipray that they call Himantura tutul, which belongs to a genetic line that is totally distinct from the three other species that are known in the same group: H. leoparda, H. uarnak and H. undulata. They frequent the same costal habitats but occupy different ecological niches.”
Image Credit: © IRD / P. Laboute

Tissue samples were taken from 115 spotted different whiprays which were collected throughout the Indio-Pacific region — after analysis it became clear that there was a previously unidentified species represented amongst the DNA samples. These new leopard-skin whiprays — which have been reproductively isolated from the other species for quite some time — have been named Himantura tutul. The new species is actually totally distinct from the other three known species in the same group: H. leoparda, H. uarnak and H. undulata — the genetic line is completely separate from that of the other three. The species all occupy the same costal habitats but apparently subsist in separate ecological niches.

The Institut de Recherche pour le Développement continues:

These studies should help to assess the state of these whipray populations and improve their conservation. Knowing the biological characteristics of each species will for instance help to redefine a minimum size for fishing purposes to avoid the catching of juveniles that belong to the larger species. Determining their geographical distribution and habitats will also make it possible to protect the breeding and nursery habitats of each species.
Economical and ecological interest

Ocellated whiprays can grow over 1.50 meters wide. These large animals start breeding fairly late, at the age of 5 or 10 years, and only in small numbers. Their populations are therefore very vulnerable. Fished for food and especially for their skin that is sold to tanneries in South-East Asia, they are threatened almost throughout the tropical Indo-West Pacific. Their overfishing will in time jeopardise a whole segment of the economy in Indonesia, which is the largest shark and whipray exploiter with 30% of all catches worldwide. In less than twenty years, the amount fished in the Java Sea has been divided by ten! As high-level predators, whiprays also play an important role in regulating ecosystems. Their extinction will threaten the functioning of coastal marine environments.

Ocellated whiprays have one or two venom glands at the base of their tail to protect them against their natural predators, namely sharks and killer whales. Their sting is painful and potentially infectious, with serious consequences if not treated correctly.

According to the International Union for Conservation of Nature (IUCN) over 36% of the 650 known ray species known are currently on their way to becoming extinct — including leopard whiprays, which are currently classified as ‘vulnerable’.




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