Spiny Butterfly Ray

Overview

The Spiny Butterfly Ray is a large, distinctively shaped marine ray found in tropical and warm-temperate Atlantic waters. Known for its exceptionally broad, diamond-shaped pectoral fin disk, this species is typically found in shallow coastal environments where it remains a solitary, bottom-dwelling predator.

Distribution & habitat

This species has a patchy, discontinuous distribution across the Atlantic Ocean. In the western Atlantic, it ranges from Massachusetts, USA, to Argentina, while in the eastern Atlantic, it is found from Portugal to Angola, including the Mediterranean and Black Seas. They prefer sandy or muddy substrates in shallow coastal waters, estuaries, and lagoons, typically at depths between 5 and 100 meters.

Appearance

The Spiny Butterfly Ray is easily recognized by its very broad, lozenge-shaped disk, which is roughly twice as wide as it is long. It features a short, whip-like tail armed with one or more venomous, serrated spines at the base. Adults often display a mosaic of small dark or light spots on a grayish-brown or reddish-brown dorsal surface, while the underside is pale. A key diagnostic feature is a small, tentacle-like structure located on the margin of each spiracle.

Biology & behavior

These rays are solitary and primarily demersal, often burying themselves in soft sediments. They exhibit oscillatory locomotion, using their large pectoral fins to "fly" through the water. Reproduction is aplacental viviparous, with females giving birth to litters of one to eight pups after a gestation period of four to nine months.

Feeding

As a carnivore, the Spiny Butterfly Ray feeds on a variety of prey, including small fishes, crustaceans, mollusks, and plankton.