Common Auger (Alternate: Screw Shell, Atlantic Auger)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Terebridae, Genus: Terebra, Species: Terebra dislocata · Terebridae (Auger family) · Gastropod (Marine Snail); spiral/turriform shape with high spire; whole shell specimen
Species
Terebra dislocata (Confidence: 90%)
Shell Type
Gastropod (Marine Snail); spiral/turriform shape with high spire; whole shell specimen
Family
Terebridae (Auger family)
Size
Approximately 12-18mm in length based on image scaling. This is a juvenile specimen; adults typically reach 1.5 to 2.25 inches (38-57mm).
Color & Pattern
Base color is a creamy tan to light orange-brown. It features subtle darker bands following the sutures. The color appears natural though slightly worn, with a pale, smooth aperture and a lack of significant periostracum.
Rarity
Very Common. These are frequently found on Atlantic and Gulf Coast beaches, though small specimens are often overlooked.
Habitat
Intertidal and shallow subtidal zones. They prefer sandy bottoms and mudflats where they can burrow just beneath the surface.
Geographic Range
Western Atlantic, ranging from Virginia to Florida, the Gulf of Mexico, and south to Brazil.
Description
An elegant, elongated turriform shell featuring a high spire with numerous whorls. The surface is decorated with a distinctive sculptural pattern of axial ribs and a spiral band just below the suture (the dislocated band), giving it its species name. The aperture is small and oval with a short siphonal canal.
Key Features
Pinching or 'dislocated' band just below the suture; numerous fine axial ribs; high, slender spire with approximately 10-15 whorls in adults; lack of a prominent fold on the columella compared to similar looking shells.
Collector Value
Low monetary value ($0.50 - $2.00) due to high abundance. However, it is a staple of 'micro-shell' collections and highly desired for its mathematical spiral symmetry.
Condition Notes
Fair to Good. The apex (tip) remains relatively sharp, but the outer lip of the aperture shows some minor erosion and chipping. The color is well-preserved for a beach-found specimen.
Interesting Facts
The animal living inside is a specialized predator that uses a venomous radula to paralyze small marine worms. Unlike most gastropods, they lack a bulbous 'eye' and have very simple sensory organs suited for life under the sand.
Ecological Role
Active predator in the sand-dwelling community; they help control the population of polychaete worms and serve as a food source for crabs and larger predatory snails.
Similar Species
Concave Auger (Terebra concava), which has more indented whorls; and the Shiny Atlantic Auger (Hastula hastata), which is much smoother and glossier.
Beach Finding Tips
Look in the 'wash' area at low tide, especially in the fine shell grit left behind by retreating waves. Sifting through sandy patches near inlets often yields the best specimens.