Scotch Bonnet (fragment)
Phylum: Mollusca, Class: Gastropoda, Order: Littorinimorpha, Family: Cassidae, Genus: Semicassis, Species: S. granulata · Cassidae (Helmet and Bonnet shells) · Gastropod (univalve) fragment, spiral-shaped shell structure
Species
Semicassis granulata
Shell Type
Gastropod (univalve) fragment, spiral-shaped shell structure
Family
Cassidae (Helmet and Bonnet shells)
Size
The visible fragment is approximately 0.75 inches long, while a complete adult Scotch Bonnet typically ranges from 2 to 4 inches.
Color & Pattern
Warm amber to golden-tan base color with distinct lighter cream-colored spiral banding and subtle beaded or cancellated texturing characteristic of the species.
Rarity
Common as a species, though finding a complete specimen can be moderately challenging; this specific fragment is very common.
Habitat
Shallow subtidal waters, sandy bottoms, offshore sandbars, and nearshore marine environments.
Geographic Range
Western Atlantic from North Carolina down through the Caribbean, Gulf of Mexico, and into South America.
Description
An oblong fragment of a Scotch Bonnet gastropod shell, displaying smooth rounded ridges, a warm golden-orange hue, and characteristic spiral ornamentation with pale cream bands.
Key Features
Distinctive rounded spiral cords intersecting with fine axial grooves, creating a granular or checkered texture, paired with a warm yellowish-orange coloration.
Collector Value
Low monetary value due to being a worn fragment, but holds sentimental value for beachcombers in North Carolina.
Condition Notes
Worn shell fragment showing smoothing from wave action, minor bore holes, and missing its aperture and spire; collectibility grade is Poor due to being a fragment.
Interesting Facts
The Scotch Bonnet is the official state shell of North Carolina, designated as such in 1965.
Ecological Role
Predatory marine snail feeding primarily on sea urchins and sand dollars, playing a regulatory role in benthic invertebrate populations.
Similar Species
Other helmet and bonnet shells (Cassis species), which generally feature heavier, larger shells with different nodule arrangements.
Beach Finding Tips
Look along high-tide shell lines on Outer Banks beaches, especially after storms or heavy surf conditions.
Notes
Obx nc