Banded Dye-murex

Overview

The Banded Dye-murex (Hexaplex trunculus) is a medium-sized marine gastropod widely recognized for its historical significance in the production of precious purple and blue dyes. This predatory sea snail is a common inhabitant of Mediterranean and nearby Atlantic coastal waters, where it plays an active role in the local marine ecosystem.

Distribution & habitat

This species is indigenous to the Mediterranean Sea and parts of the eastern Atlantic, including the coasts of Portugal, Morocco, and the Canary Islands. It thrives in shallow waters, typically ranging from the surface down to 50 meters, and is commonly found on rocky, sandy, or muddy substrates, as well as within seagrass beds.

Appearance

The shell of the Banded Dye-murex is robust and broadly conical, generally measuring between 4 and 10 cm in length. It features a high spire with seven angulated whorls and a short, deep siphonal canal. The shell's surface is highly variable, often displaying dark spiral bands and a rough texture created by ridges, tubercles, or spines. These shells are frequently camouflaged by algae, helping the snail blend into the seafloor.

Biology & behavior

Hexaplex trunculus is an opportunistic predator that often hunts in groups. Unlike many other gastropods, it shows little preference for the size of its prey. Historically, this snail was highly valued by ancient Mediterranean civilizations, including the Phoenicians and Greeks, who harvested the mucus from its hypobranchial gland to create luxurious purple-blue dyes.