Round ribbontail ray
A large, venomous stingray of tropical Indo-Pacific reefs.
The round ribbontail ray, also called the blotched fantail ray, marble ray, or marbled ray (scientific name *Taeniurops meyeni*), belongs to the stingray family Dasyatidae. It lives in shallow coastal waters across the tropical Indo-Pacific and around certain eastern Pacific islands. This bottom-dwelling ray favors lagoons, estuaries, and reefs, usually at depths between 20 and 60 meters (66–197 feet). It can grow to 1.8 meters (5.9 feet) across, making it a large species. Its body features a thick, rounded pectoral fin disc covered with small tubercles on top, a relatively short tail with a deep fin fold underneath, a variable light-and-dark mottled pattern on its upper side, and a black tail.
Active mainly at night, the round ribbontail ray may live alone or in groups. It hunts small bottom-dwelling mollusks, crustaceans, and bony fish. Reproduction is aplacental viviparous: embryos first rely on yolk, then on histotroph ("uterine milk") from the mother, and litters can include up to seven pups. Though not aggressive, it will defend itself with a venomous tail spine if provoked, and has caused at least one human death. Divers and recreational anglers value this ray, but its slow reproduction makes it vulnerable to targeted fishing, bycatch, and habitat loss across much of its range. The IUCN therefore lists it as Vulnerable.
Quick Facts
- Genus
- Taeniurops
- Species
- meyeni
Facts from the source article.
Lore & Background
The round ribbontail ray was described by German biologists Johannes Peter Müller and Friedrich Gustav Jakob Henle in 1841, based on syntypes from Mauritius. It is also known under the name Taeniura melanospilos, applied by Pieter Bleeker to a juvenile from Java. The ray is named in honor of Franz Julius Ferdinand Meyen, a physician and botanist who supplied type specimens. It has a thick, rounded pectoral fin disc covered by small tubercles, a relatively short tail with a deep ventral fin fold, and a variable light and dark mottled pattern on its upper surface. The tail is uniformly black past the spine. It is bottom-dwelling, inhabiting lagoons, estuaries, and reefs at depths of 20–60 m, and is nocturnal, resting motionless during the day often near vertical structures or under ledges. It feeds on bivalves, crabs, shrimps, and small bony fishes, using a characteristic posture to blow water through its mouth to uncover prey. It is aplacental viviparous, with embryos sustained by yolk and later histotroph; litters of up to seven pups are born. If provoked, it defends itself with a venomous tail spine and has been responsible for at least one fatality.
Reader's Guide
The round ribbontail ray is valued by ecotourist divers and recreational anglers for its size and spectacular appearance. It is not aggressive and may approach divers, but can inflict severe wounds if harassed. The International Union for Conservation of Nature (IUCN) has assessed it as Vulnerable due to its slow reproductive rate and threats from commercial fishing, both targeted and as bycatch, as well as habitat degradation across much of its range. It is caught using line gear and trawls, and in Indonesian waters it is taken intentionally by tangle netters, longliners, and trawlers, with all landed individuals brought to market for human consumption. The species cannot withstand heavy fishing pressure, and its coral reef habitat is degraded by agricultural runoff and destructive practices such as blast fishing.
Did You Know?
- The round ribbontail ray can grow to 1.8 m across and weigh up to 150 kg.
- This species has been responsible for at least one recorded fatality of a diver who attempted to ride the ray.
- Reproductive aggregations numbering in the hundreds have been observed at Cocos Island after the onset of La Niña.
More in Reef Sharks and Rays, Part 3 1-24
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