Mulberry Drupe (also known as the Mulberry Whelk or Black-spotted Drupe)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Drupa, Species: Drupa morum · Muricidae (Murex or Rock Snail family) · Gastropod (univalve); whole shell; globose/ovate shape with short spire and heavy sculpting.
Species
Drupa morum
Shell Type
Gastropod (univalve); whole shell; globose/ovate shape with short spire and heavy sculpting.
Family
Muricidae (Murex or Rock Snail family)
Size
Approximately 15-20mm (0.6-0.8 inches). This is a juvenile or smaller specimen; adults typically reach 25-45mm.
Color & Pattern
The base color is a creamy white to off-white, strikingly patterned with rows of dark brown to purplish-black nodules or 'dots' that resemble mulberries. The interior (aperture) of this species is typically a rich violet or purple, though not fully visible in this angle.
Rarity
Common within its natural range, though high-quality specimens with intact nodules are always a nice find for beachcombers.
Habitat
Intertidal and shallow subtidal zones; typically found on wave-swept rocky shores, coral reefs, and under coral slabs. It is a marine species.
Geographic Range
Widespread across the Indo-Pacific region, from East Africa and the Red Sea to Hawaii and the Tuamotu Islands.
Description
A thick, heavy, and sturdy shell designed to withstand high-energy wave action. It features a low spire and a large body whorl covered in several rows of prominent, rounded dark nodules. The shell surface between nodules is relatively smooth or finely striated. The outer lip is thick and often possesses teeth-like projections (denticles).
Key Features
Distinctive 'mulberry' pattern of dark brown/black raised nodules on a white background; heavy, globose structure; violet-purple aperture; short spire.
Collector Value
Low to modest (typically $2-$10 USD). It is a staple in Indo-Pacific collections due to its beautiful contrast, though its commonness keeps the price low for standard specimens. Large, 'Gem' grade specimens with deep purple apertures are more desirable.
Condition Notes
Fine to Good condition. The nodules appear sharp and well-defined, and the white base is bright. There is slight blunting of the lower spines/nodules, typical of beach-collected specimens tumbled by the tide. No visible predator bore holes.
Interesting Facts
The animal inside is a carnivore that uses its radula to bore into the shells of other mollusks or tube worms. The common name refers to its resemblance to the fruit of a mulberry tree. Historically, some Drupa species have been used in smaller jewelry or as decorative elements in tropical crafts.
Ecological Role
A specialized predator that helps control populations of small invertebrates on the reef. It is a hardy species that occupies a niche in high-turbulence environments where other snails might be crushed.
Similar Species
Drupa ricinus (Prickly Drupe) which has longer, more pointed spines; Drupa rubusidaea (Strawberry Drupe) which has more reddish/pinkish tones.
Beach Finding Tips
Search in the drift line of coral beaches or among volcanic rock tide pools during low tide. They are often found wedged in crevices to avoid being swept away by the surf.