The sepia stingray is a small, little-known benthic ray. Found in the northwestern Pacific ocean, it lives discreetly on coastal seabeds where it often goes unnoticed thanks to its dark coloration and secretive behavior.

The sepia stingray has a flattened, disc-shaped body typical of stingrays. Its coloration ranges from brown to reddish-brown, sometimes slightly orangish, allowing it to blend effectively into sandy bottoms. Its tail is relatively short and equipped with a venomous stinger used solely for defense.

The sepia stingray generally reaches a modest size, rarely exceeding about 20 inches in length, making it a small to medium-sized ray species.

The sepia stingray is mainly found in the temperate waters of the northwestern Pacific, particularly off Japan, China, and Korea, as well as around the Ryukyu islands.

The sepia stingray inhabits sandy or muddy bottoms of coastal areas and the continental shelf. It is usually found in shallow waters, although it may occasionally occur at greater depths. A discreet species, it spends much of its time buried in sediment or resting on the seabed to avoid predators.

The sepia stingray is an opportunistic predator that feeds mainly on benthic invertebrates. Its diet includes crustaceans, marine worms, mollusks, and small organisms living in or on the seabed. It uses its sensory abilities to detect prey buried in the sand.

The sepia stingray is an ovoviviparous species, meaning that embryos develop inside the female's body before being born fully formed. As a result, the young are immediately independent at birth and already large enough to survive in their benthic environment.

As with many rays, its reproductive cycle is still only partially documented.