Black-Spiked Drupe or Mulberry Shell (also known as Drupa morum)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Muricidae, Genus: Drupa, Species: Drupa morum · Muricidae (Murex family and rock shells) · Gastropod, whole shell, spiral shape with prominent spines
Species
Drupa morum
Shell Type
Gastropod, whole shell, spiral shape with prominent spines
Family
Muricidae (Murex family and rock shells)
Size
Approximately 1 inch (25 mm) in length, which is typical for a young adult or average-sized specimen of this species. Adults typically range between 1 and 2 inches (25-50 mm).
Color & Pattern
The background color is an off-white to pale yellowish-cream, heavily adorned with bold, dark brown to jet-black nodules and sharp spines tipped in black. The coloration is completely natural and typical for the species.
Rarity
Common in its natural rocky reef habitats throughout the Indo-Pacific, though finding a specimen in pristine beach-worn or intact condition can occasionally require dedicated searching.
Habitat
Inhabits intertidal and shallow subtidal zones, specifically on rocky shores, outer reef flats, and wave-swept benches where it clings tightly to rocks in high-energy marine environments.
Geographic Range
Indo-Pacific region, spanning from East Africa and the Red Sea through the tropical Indian Ocean to Polynesia, Hawaii, and Australasia, including the Maluku Islands.
Description
A remarkably heavy and solid rock shell featuring a low spire and a heavily armed exterior covered in rows of blunt, dark-tipped spines and knobs. The aperture is narrow, reinforced by a thickened outer lip armed with strong teeth, and leads into a short, deep siphonal canal. Its robust architecture is perfectly adapted to withstand crashing surf.
Key Features
Distinguished by its heavy, solid structure, low spire, rows of distinct black-tipped spines and tubercles, and a narrow, toothed aperture characteristic of the rock-dwelling Muricidae family.
Collector Value
Moderately valued by shell collectors who focus on Indo-Pacific micromollusks and rock-dwelling gastropods. While common, well-spined specimens like this are staples in decorative and educational collections.
Condition Notes
The specimen appears to be in Fine to Gem condition with intact spines, bright natural coloration, and minimal wear, making it a very desirable display piece for a collection.
Interesting Facts
Drupa species are active predatory carnivores that feed primarily on other marine invertebrates, using their radula and specialized secretions to bore into or pry open the shells of barnacles and small bivalves.
Ecological Role
Acts as a primary carnivorous predator in intertidal rocky reef ecosystems, helping to regulate populations of barnacles and other grazing invertebrates. It plays a crucial role in maintaining local biodiversity.
Similar Species
Drupa ricinus (Soap-dish Drupa), which features a similar spiky appearance but tends to be slightly more elongated with distinct color banding inside the aperture.
Beach Finding Tips
Look along exposed rocky coastlines, reef benches, and tide pools at extremely low tide. Carefully inspect crevices and underneath heavy rock ledges where these snails shelter from the crashing surf.
Notes
Maluku