Scotch Bonnet (also known as the Banded Bonnet)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cassidae, Genus: Phalium, Species: Phalium granulatum · Cassidae (Helmet and Bonnet family) · Gastropod, whole spiral shell
Species
Phalium granulatum
Shell Type
Gastropod, whole spiral shell
Family
Cassidae (Helmet and Bonnet family)
Size
Approximately 2 to 3 inches in length, which is typical for a mature specimen. Adult specimens generally range from 1.5 to 4 inches.
Color & Pattern
Glossy porcelain-like surface featuring a creamy white or pale yellowish-tan base overlaid with distinct rows of square or rectangular brownish-orange spots and bands. The colors are natural and vibrant with a polished finish.
Rarity
Common to Uncommon, frequently found by dedicated beachcombers or divers in its native range, particularly after storms.
Habitat
Found in shallow subtidal waters, typically on sandy bottoms, offshore sand bars, and near coral reefs or seagrass beds, from the low intertidal zone down to depths of about 150 feet. It is a marine species.
Geographic Range
Western Atlantic Ocean, ranging from North Carolina through the Caribbean, Gulf of Mexico, and down to Brazil.
Description
An attractive, sturdy, and inflated oval shell with a low, pointed spire and a moderately large body whorl. The surface is subtly sculpted with flattened spiral cords and faint granules near the suture. The outer lip is thickened and slightly flared with small denticles on the interior margin, and the columella is wrinkled.
Key Features
Inflated rounded body whorl, low spire, distinctive rows of square brownish-orange spots, and a thickened, toothed outer lip characteristic of the Cassidae family.
Collector Value
Moderately high collectible value, especially for well-patterned, intact specimens. They are very popular among regional shell collectors and are frequently featured in shell crafts and displays.
Condition Notes
The specimen appears to be in Fine to Gem condition, with intact spire, glossy finish, minimal wear, and bright original color patterns showing no major bleaching or structural damage.
Interesting Facts
Scotch Bonnet is the official state seashell of North Carolina. Members of the Cassidae family are specialized predators that primarily feed on sea urchins and sand dollars, using a specialized proboscis and acidic secretions to bore through their prey's test.
Ecological Role
Acts as a key carnivorous predator in benthic sandy environments, helping to control sea urchin populations. Empty shells frequently serve as mobile homes for hermit crabs.
Similar Species
Can be confused with other bonnet shells such as the Yellow Helmet (Cypraecassis testiculus) or the Smooth Bonnet (Phalium glabratum), but distinguished by its characteristic square brownish-orange spot pattern and distinct spiral banding.
Beach Finding Tips
Best found by beachcombing on outer barrier islands after heavy offshore storms or rough wave action, particularly during low tide on sandy beaches.