Porcupine ray (Urogymnus asperrimus)

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Porcupine ray on coral reef
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Porcupine ray fact file

Porcupine ray description

KingdomAnimalia
PhylumChordata
ClassChondrichthyes
OrderRajiformes
FamilyDasyatidae
GenusUrogymnus (1)

The porcupine ray is a highly distinctive, but little known species, which is named for the unusual thorny projections that are found on the upperside of its body (4) (5). This species has a thick, oval, disc-shaped body, a rounded snout and a long, whip-like tail, which does not possess the venomous barb that is characteristic of most members of the stingray family (Dasyatidae) (2). Instead, this species is protected from predators by its armoured body, which is covered with a mixture of large, sharp, conical thorns and smaller, pointed projections known as “denticles”. The young lack the thorns, but bear numerous large, flat denticles on the upper surface of the body (2) (5). The colouration of this species is brown to light grey above and white below, while the tail is blackish, becoming darker towards the tip (2) (5).

Also known as
roughskin stingaree, rough-skinned ray, Solander’s ray, thorny Ray.
Size
Length: up to 147 cm (2)
Disc width: 1 m (3)
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Porcupine ray biology

Little is known about the life history of the porcupine ray. It forages on and around the sea-bed for bottom-dwelling crustaceans, polychaete worms and fish (2) (4). Prey is grasped in the ray’s downward-facing jaws, which bear rows of flattened teeth capable of crushing hard, outer shells (6). Like other stingrays, the porcupine ray probably retains its eggs internally during development, so that once the egg hatch, the female gives birth to a litter of live young (6) (7).

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Porcupine ray range

The porcupine ray is widely distributed throughout the Indian Ocean and the Indo-West Pacific, occurring from the coast of East Africa and the Red Sea, east as far as Marshall Islands and Fiji, and south as far as northern Australia (1) (4). It also occurs in tropical inshore waters of the East Atlantic, around central West Africa (4).

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Porcupine ray habitat

The porcupine ray is found on or near the sea-bed in shallow inshore water, often in association with coral reefs. It commonly occurs over sand or coral rubble substrates, frequently in caves (2) (4).

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Porcupine ray status

Classified as Vulnerable (VU) on the IUCN Red List (1).

IUCN Red List species status – Vulnerable

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Porcupine ray threats

Despite its large range, the porcupine fish is not regularly recorded by fisheries surveys, and is therefore believed to have a relatively small population. The population data that is available for this species indicates that it has undergone a significant population decline in parts of the centre of its range (1). The reason for this is unclear, as while the meat, skin and cartilage all have commercial value, the porcupine fish typically has little or no importance to fisheries. It is, however, often caught as bycatch in trawls and beach seines, which may be having a detrimental effect on its population. (2) (4).

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Porcupine ray conservation

There are no known conservation measures in place for the porcupine ray (1). Individuals have, however, been recorded in the Nature Reserve of the Glorieuses Islands (8), and given this species’ large range, it almost certainly occurs in other protected areas (9).

View information on this species at the UNEP World Conservation Monitoring Centre.
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Find out more

To learn more about the conservation of sharks and rays visit:

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
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Glossary

Beach seines
A form of fishing net, with floats at the top and weights at the bottom, which is used to surround a U-shaped area of water close to shore, before being pulled in to the beach, bringing all sea-life within the area with it.
Bycatch
In the fishing industry, the part of the catch made up of non-target species.
Crustaceans
Diverse group of arthropods (a phylum of animals with jointed limbs and a hard chitinous exoskeleton) characterised by the possession of two pairs of antennae, one pair of mandibles (parts of the mouthparts used for handling and processing food) and two pairs of maxillae (appendages used in eating, which are located behind the mandibles). Includes crabs, lobsters, shrimps, slaters, woodlice and barnacles.
Polychaete worms
Deriving from polychaeta, which means ‘many bristled’; this class of worms are segmented and bear many ‘chaetae’ (bristles).
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References

  1. IUCN Red List (October, 2009)
    http://www.iucnredlist.org
  2. FishBase (October, 2009)
    http://www.fishbase.org/summary/SpeciesSummary.php?id=5400
  3. Australian Museum (October, 2009)
    http://australianmuseum.net.au/Porcupine-Ray-Urogymnus-asperrimus-Bloch-Schneider-1801
  4. Bonfil, R. and Abdallah, M. (2004) Field identification guide to the sharks and rays of the Red Sea and Gulf of Aden: FAO species identification guide for fishery purposes. Food and Agriculture Organization of the United Nations, Rome.
  5. Smith, M.M. and Heemstra, P.C. (2003) Smiths' Sea fishes. Struik, Cape Town.
  6. Burnie, D. (2001) Animal. Dorling Kindersley, London.
  7. ReefQuest Centre for Shark Research (October, 2009)
    http://elasmo-research.org/education/topics/lh_rep_modes.htm
  8. Durville, P., Chabanet, P. and Quod, J.P. (2003) Visual Census of the Reef Fishes in the Natural Reserve of the Glorieuses Islands (Western Indian Ocean). Western Indian Ocean Journal of Marine Science, 2: 95 - 104.
  9. The World Database on Protected Areas (October, 2009)
    http://www.wdpa.org
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Image credit

Porcupine ray on coral reef  
Porcupine ray on coral reef

© Jason Isley / www.scubazooimages.com

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