Pink-Mouth Murex
Kingdom: Animalia, Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Hexaplex, Species: erythrostomus · Muricidae (Murex family or Rock Snails) · Gastropod (univalve); Spiral-fusiform with multiple frilled varices.
Species
Hexaplex erythrostomus
Shell Type
Gastropod (univalve); Spiral-fusiform with multiple frilled varices.
Family
Muricidae (Murex family or Rock Snails)
Size
Approximately 3-4 inches (75-100mm) based on wood grain scale; typical adult range is 2.5 to 6 inches.
Color & Pattern
The exterior is a creamy white or pale tan with subtle brownish banding along the varices and spiral cords. The interior aperture (not fully visible but suggested by the name and genus) is typically a vibrant, glossy porcelain pink or rose.
Rarity
Common to Very Common within its natural range. It is one of the most frequently seen Murex species in shell markets and on sandy shores after storms.
Habitat
Shallow water to subtidal depths (under 20 meters), usually on muddy or sandy substrates near rocky reef outcrops. This is a marine species.
Geographic Range
Common along the Eastern Pacific coast, ranging from the Gulf of California (Sea of Cortez) south to Peru.
Description
A robust, globose shell featuring six to eight prominent varices (ribs) adorned with short, branched, leaflike frilled spines. The shell has a moderately low spire and a large, rounded body whorl. The texture is characterized by fine spiral cords between the spiny ribs, giving it a rugged, ornate appearance typical of 'rock snails.'
Key Features
Distinguished by its heavy weight, multiple rows of branched spines per whorl, and the signature pink-tinted aperture. The spines on Hexaplex erythrostomus are generally more numerous and less 'tangled' than those of the similar Hexaplex regius.
Collector Value
Relatively low ($5–$20 USD depending on size and spine perfection). It is highly desirable for beginners due to its beauty and the striking contrast between its white exterior and pink interior.
Condition Notes
The specimen shows some minor erosion and blunting of the delicate spines, likely from beach wear or surf action. The overall structure is intact, but the 'frills' are not as sharp as a live-taken specimen. Condition: Fine to Good. Collectibility: Decent reference specimen.
Interesting Facts
The 'pink mouth' helps distinguish it from the 'Regal Murex' (H. regius), which has a darker, more brownish-black margin. Historically, murex shells were used to produce 'Tyrian purple' dye, though this specific Pacific species wasn't the primary source used by ancient Phoenicians.
Ecological Role
A predatory marine snail. It uses its radula and acid to drill into the shells of bivalves (clams and oysters) to feed. It is an important regulator of bivalve populations in its ecosystem.
Similar Species
Hexaplex regius (Regal Murex), which has a darker interior margin and more intense brownish coloration; Muricanthus nigritus (Black Murex), which is larger and strictly black and white.
Beach Finding Tips
Look for these in the Gulf of California at low tide, particularly after high winds or heavy storms. They are often found partially buried in sand or wedged in crevices near rocky points during spring tides.