Marlin Spike, Marlin-spike Auger
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Terebridae, Genus: Terebra, Species: T. maculata · Terebridae (Auger family) · Gastropod, whole shell, elongate-turreted spiral shape
Species
Terebra maculata
Shell Type
Gastropod, whole shell, elongate-turreted spiral shape
Family
Terebridae (Auger family)
Size
Approximately 4 to 5 inches in length, which is a medium-to-large size for this species. Adults typically range from 3 to 7 inches (up to 9 inches for exceptional specimens).
Color & Pattern
Base color is a creamy white or pale yellowish-white, adorned with characteristic rows of dark brown to black rectangular spots or blotches running along the sutures and mid-whorls. Colors appear natural but slightly weathered by the surrounding sand and surf.
Rarity
Common in its native range, though intact, well-patterned specimens of this size require some active searching in sand flats.
Habitat
Found primarily in shallow subtidal waters down to about 30 meters, buried in clean sandy substrates, sand flats, and coral sand environments.
Geographic Range
Indo-Pacific region, spanning from East Africa and the Red Sea across the Indian Ocean to Polynesia, Hawaii, and Australia.
Description
An elongate, slender, high-spired auger shell featuring numerous flat-sided whorls and a sharp apex. The surface is relatively smooth with subtle spiral grooves and characteristic square-to-rectangular dark spots arranged in bands against a pale background. The aperture is small and ovate with a short, notched anterior canal.
Key Features
Extremely elongated turret shape with many tightly wound flat whorls, distinct rows of dark square spots on a white background, and a lack of strong sculptural ribs compared to other augers.
Collector Value
Moderately valued by general shell collectors as a classic Indo-Pacific auger representative. Typically sells for a modest price, with value increasing based on exceptional length, pristine patterns, and locality data.
Condition Notes
The specimen is mostly intact with some adhering sand particles from its beach environment. Slight wear is visible on the apex and outer surface, grading this specimen as Good to Fine.
Interesting Facts
Terebridae are venomous carnivorous snails that hunt marine worms using a specialized radular tooth acting as a harpoon, injecting venom to paralyze their prey. The Marlin Spike is one of the largest species in the auger family.
Ecological Role
Functions as an important apex predator in sandy benthic ecosystems, helping control polychaete worm populations. Non-endangered and not heavily restricted, though sustainable collecting is always encouraged.
Similar Species
Terebra guttata (many-spotted auger), which features rounder spots, and Oxymeris dimidiata (blunted auger), which has bright orange-red coloration instead of black spots.
Beach Finding Tips
Look along tropical Indo-Pacific sandy beaches at low tide, particularly around sand bars and reef flats where heavy surf uncovers buried subtidal shells.