Spotted Auger (also known as the Variable Auger)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Terebridae, Genus: Terebra, Species: Terebra guttata · Terebridae (Auger family) · Gastropod, whole shell, tubular/spiral shape
Species
Terebra guttata
Shell Type
Gastropod, whole shell, tubular/spiral shape
Family
Terebridae (Auger family)
Size
Approximately 2.5 inches in length. This is moderate for the species, which typically ranges from 2 to 5 inches.
Color & Pattern
Cream to off-white base color adorned with distinctive, evenly spaced orange-brown or reddish-brown spots arranged in spiral rows around each whorl. The pattern is natural and sharp.
Rarity
Common
Habitat
Shallow subtidal waters down to moderate depths, residing on sandy bottoms and sand flats in coral reef environments.
Geographic Range
Indo-Pacific region, spanning from East Africa and the Red Sea through Southeast Asia to Polynesia and Australia.
Description
An elegant, highly elongated, turreted spire shell featuring numerous flat-sided whorls. The surface is smooth with a distinct suture line, culminating in a sharp apex and featuring a small, oval aperture with a short siphonal canal at the base.
Key Features
Extremely high-spired, slender conical shape with numerous flat whorls and characteristic rows of distinct brownish-orange rounded spots against a pale cream background.
Collector Value
Moderately popular among shell collectors focusing on Indo-Pacific turrids and augers. Common specimens typically sell for a few dollars, while exceptionally large or pristine specimens fetch slightly more.
Condition Notes
Good condition with minor wear at the fragile tip. Colors are vibrant and natural. No major fractures or boring holes. Collectibility grade: Fine.
Interesting Facts
Auger snails are carnivorous predators that hunt marine worms (polychaetes) buried in the sand. Some species possess a venom gland and a modified radula tooth used to immobilize their prey.
Ecological Role
Acts as an active predator of benthic worms, helping to regulate marine invertebrate populations in sandy substrate ecosystems.
Similar Species
Terebra maculata (Marlin Spike Auger), which is generally larger with dark rectangular blotches rather than rounded orange spots.
Beach Finding Tips
Look along tropical sandy beaches and sand bars at low tide, or sift through shallow driftlines after storms in the Indo-Pacific region.