Variable Nassarius, also known as the Stained Nassarius
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Nassariidae, Genus: Nassarius, Species: Nassarius mutabilis · Nassariidae (Nassa mud snails or dog whelks) · Gastropod, whole shell, spiral shape
Species
Nassarius mutabilis
Shell Type
Gastropod, whole shell, spiral shape
Family
Nassariidae (Nassa mud snails or dog whelks)
Size
Approximately 1.2 inches in length, which is average for an adult specimen of this species; adults typically range from 0.8 to 1.5 inches.
Color & Pattern
Rich dark brown and chestnut bands contrasted with warm amber and cream tones near the apex. The surface displays strong longitudinal ribs and spiral striations. The aperture interior is smooth, showcasing a polished dark brown margin transitioning to a glossy white or bluish-white interior.
Rarity
Common in its native range, frequently encountered in suitable marine mudflat and sandy habitats.
Habitat
Inhabits shallow subtidal and intertidal zones, typically found buried in soft sandy, muddy, or fine gravel substrates in marine environments.
Geographic Range
Found primarily in the Mediterranean Sea and along the eastern Atlantic coast extending down to parts of West Africa.
Description
A robust, elegantly proportioned spiral gastropod shell featuring a high spire and distinct axial ribs crossed by fine spiral grooves. The outer surface is beautifully patterned with rich brownish-black and caramel tones. The aperture is ovate with a short, notched anterior canal, characteristic of scavenging neogastropods.
Key Features
High pointed spire, prominent axial ribs, distinct spiral cords, ovate aperture with a short siphonal canal, and dark glossy interior contrasting with warm exterior banding.
Collector Value
Moderately valued by general shell collectors as an attractive and representative member of the Nassariidae family, typically sold affordably in shell shops.
Condition Notes
Specimen is in excellent 'Fine' condition, with intact spire, well-preserved lip, strong original coloration, and no significant wear, fading, or boring marks.
Interesting Facts
Nassarius species are active marine scavengers equipped with a keen sense of smell, often using their long siphons to detect decaying organic matter on the sea floor from a distance.
Ecological Role
Functions primarily as an important marine scavenger and detritivore, helping to clean the sea floor by consuming dead organic matter, and serving as a prey item for larger fish and crustaceans.
Similar Species
Nassarius reticulatus (Neted Dog Whelk) which features a more heavily reticulated, coarse surface sculpture and lacks the smoother glossy appearance of Nassarius mutabilis.
Beach Finding Tips
Look along sandy or muddy intertidal zones during low tide, or sift through fine shell drift along Mediterranean beaches.