Wentletrap Worm Shell or Vermetid Gastropod
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Vermetidae, Genus: Vermicularia, Species: Vermicularia spirata · Vermetidae (Worm Snail family) · Gastropod (worm-like univalve), whole shell, tubular and irregularly coiled shape
Species
Vermicularia spirata
Shell Type
Gastropod (worm-like univalve), whole shell, tubular and irregularly coiled shape
Family
Vermetidae (Worm Snail family)
Size
Approximately 1 to 2 inches in length, which is average for this species. Adults typically range from 1 to 3 inches.
Color & Pattern
Pale peach to light brown with off-white highlights. The color is natural and consistent throughout the length of the calcareous tube.
Rarity
Common, frequently found attached to other shells or washed ashore in rocky coastal areas.
Habitat
Shallow subtidal and intertidal zones, typically attached to hard substrates like rocks, shells, or coral reefs in marine environments.
Geographic Range
Western Atlantic, extending from North Carolina through the Caribbean, Gulf of Mexico, and down to Brazil.
Description
An unusual gastropod that starts life with a regular spiral coil resembling a tiny snail before breaking out into an irregular, twisted, worm-like tubular growth. The calcareous tube is rigid, somewhat smooth with faint growth lines, and exhibits a gentle pinkish-tan hue.
Key Features
Initial tightly-coiled embryonic whorls followed by an elongated, meandering, tube-like structure that resembles a worm rather than a typical snail shell.
Collector Value
Low to moderate commercial value. While not a high-priced collector prize, they are appreciated by shell enthusiasts for their bizarre morphology that blurs the line between worms and mollusks.
Condition Notes
Good condition, intact tubular structure with minor natural wear, moderate fading from sun exposure, collectibility grade is Good.
Interesting Facts
Unlike most snails that crawl in search of food, vermetid snails are stationary filter feeders. They cast out web-like mucus nets from their mouths to trap microscopic plankton and organic particles, reeling them back in to eat.
Ecological Role
Acts as a micro-habitat provider for various small marine organisms. They are filter feeders playing a part in nutrient cycling within shallow marine ecosystems.
Similar Species
Serpulid or Sabellid polychaete worm tubes, which are made of calcium carbonate by segmented worms rather than mollusks and lack the initial true snail-like coiling of Vermicularia.
Beach Finding Tips
Look among driftlines on sandy-rocky beaches, or inspect larger discarded bivalve and gastropod shells where these worm snails often cement themselves.