Scotch Bonnet
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cassidae, Genus: Phalium, Species: Phalium granulatum · Cassidae (Helmet and Bonnet family) · Gastropod (snail/univalve), whole shell, spiral shape
Species
Phalium granulatum
Shell Type
Gastropod (snail/univalve), whole shell, spiral shape
Family
Cassidae (Helmet and Bonnet family)
Size
Approximately 3.5 inches in length, which is large and above average for this species. Adults typically range from 2 to 4 inches.
Color & Pattern
Cream to light golden-yellow base color with distinct rows of square or rectangular reddish-brown spots forming a checkered or banded pattern. The apex and spire feature a rich, rosy-brown or orange hue. Colors appear natural and well-preserved.
Rarity
Common to Uncommon, though finding a pristine, large specimen washed ashore intact is considered a rewarding beach find.
Habitat
Shallow subtidal waters down to moderate depths, typically found on sandy bottoms, sandbars, and offshore shoals, often buried in sand during the day. Marine environment.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through the Gulf of Mexico, the Caribbean Sea, and down to Brazil.
Description
An attractive, bulbous, lightweight shell featuring a low spire and a greatly inflated body whorl. The surface is adorned with distinct spiral cords and fine longitudinal growth lines, creating a subtle textured grid. The aperture is wide with a thickened, reflected outer lip that has faint denticles on the inner edge, and a short, recurved siphonal canal.
Key Features
Inflated, rounded body whorl, low flattened spire, checkered reddish-brown square markings on a pale background, and a thickened outer lip with a notch near the base.
Collector Value
Moderately high desirability among regional and specialized collectors, particularly for larger, well-patterned specimens. Usually valued between $10 to $30 depending on exact size and condition, and commonly featured in coastal shell shops.
Condition Notes
Very good to fine condition. The shell is intact with strong natural coloration, minimal fading, well-defined pattern markings, and no major structural fractures, meriting a 'Fine' collector grade.
Interesting Facts
The Scotch Bonnet is the official state shell of North Carolina. Members of the Cassidae family are specialized predators that feed primarily on sea urchins and sand dollars, using their acidic saliva to drill through the prey's hard test.
Ecological Role
Acts as an important carnivorous predator in benthic sandy environments, helping to control sea urchin and sand dollar populations. The species is not currently endangered, but collection is subject to local regional shell-gathering ethics.
Similar Species
Bandéd Helmet (Cypraecassis testiculus), which is heavier, more elongated, and has coarser sculptural ribs rather than the smooth, rounded form of the bonnet.
Beach Finding Tips
Best found after severe offshore storms or hurricane activity along the southeastern coast of the United States and the Gulf of Mexico. Look along high tide lines on sandy beaches, especially during extremely low tides.