Spinose Murex (Bolineus brandaris) or Purple Dye Murex
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Bolineus, Species: B. brandaris · Muricidae (Murex family) · Gastropod (univalve); Spiral/Fusiform whole shell with prominent sculpture and siphonal canal.
Species
Bolineus brandaris (Confidence: High)
Shell Type
Gastropod (univalve); Spiral/Fusiform whole shell with prominent sculpture and siphonal canal.
Family
Muricidae (Murex family)
Size
Approximately 2.5 - 3 cm in length. This is a juvenile specimen; adults of this species typically range from 6 cm to 10 cm.
Color & Pattern
Tawny beige to sandy brown base color. The specimen appears slightly beach-worn or calcite-encrusted, which softens the natural yellowish-brown pigment. The interior aperture typically shows a creamy to pale orange coloration in healthy adults.
Rarity
Very Common. It is one of the most frequently encountered murex shells in Portugal and the Mediterranean.
Habitat
Intertidal and subtidal zones, generally on sandy-muddy bottoms or gravelly substrates at depths ranging from 5 to 200 meters.
Geographic Range
Widespread throughout the Mediterranean Sea and along the Atlantic coasts of Portugal (Lisbon area), Spain, and North Africa.
Description
A robust, medium-sized gastropod shell featuring a high spire and a long, straight siphonal canal (though often broken in beach finds). This specimen exhibits characteristic rows of nodules and spines (varices) that spiral down the whorls, creating a rugged, architectural appearance typical of the Muricidae family.
Key Features
Characteristic rows of short, blunt spines on the varices, a prominent columella, and a long (though here abbreviated) siphonal canal. The club-like shape of the body whorl compared to the spire and the specific arrangement of 6-7 varices per whorl are diagnostic.
Collector Value
Low for a beach-worn specimen (under $1), but highly desirable to casual beachcombers for its historical significance and interesting form. Fishermen-sourced 'Gem' specimens with intact long spines may carry a value of $5-$15.
Condition Notes
Beach-worn / Fair. The delicate spines and the long siphonal canal have been eroded or broken by wave action. The color is somewhat dull compared to live-taken specimens, indicating it spent significant time in the surf.
Interesting Facts
This species was historically vital for the production of 'Tyrian Purple' dye. Thousands of these snails were crushed by the Phoenicians and Romans to extract a tiny amount of mucus that, when oxidized, produced a royal purple dye reserved for the elite. It is still a popular seafood item in Portugal and Spain, known as 'Buzio'.
Ecological Role
A carnivorous predator that feeds on other mollusks and barnacles by drilling holes through their shells with its radula. It is a vital component of the benthic food web.
Similar Species
Hexaplex trunculus (Murex trunculus), which is darker, has a broader body, and produces a blue-toned dye; and Murex erinaceus, which has more webbed varices.
Beach Finding Tips
The best time to find these near Lisbon is after Atlantic storms or at very low tides on sandy beaches near rocky outcroppings. Look for the distinctive spiral shape half-buried in the sand or among piles of 'drift' near the tide line.
Notes
Lisbon, Portugal