Wentletrap, Noble Wentletrap, or Sundial Snail
Phylum: Mollusca, Class: Gastropoda, Order: Heterostropha, Family: Architectonicidae, Genus: Architectonica, Species: Architectonica nobilis · Architectonicidae (Sundial Shell family) · Gastropod (univalve), whole shell, flattened spiral disc shape
Species
Architectonica nobilis
Shell Type
Gastropod (univalve), whole shell, flattened spiral disc shape
Family
Architectonicidae (Sundial Shell family)
Size
Approximately 1 to 1.5 inches in diameter, which is typical for a medium-sized specimen of this species. Adults generally range from 1 to 2 inches across.
Color & Pattern
Creamy white base with subtle yellowish-brown markings and dots along the spiral cords. Colors appear relatively natural with slight fading from weathering.
Rarity
Uncommon to Rare depending on the location, as finding a whole, undamaged specimen while beachcombing requires some luck.
Habitat
Found in shallow to moderately deep subtidal waters, typically living on sandy or muddy bottoms where it burrows or feeds on anemones.
Geographic Range
Warm waters of the Western Atlantic, including the Caribbean Sea, Gulf of Mexico, and extending down to Brazil.
Description
An exquisite, low-spired disk-like shell featuring a deeply recessed, open umbilicus that reveals the internal whorls like a staircase. The surface is adorned with beaded spiral cords and delicate crenulated margins along the periphery.
Key Features
Extremely flattened spire, wide and deeply open umbilicus showing all internal whorls, distinct beaded spiral ribs, and a roughly circular outline.
Collector Value
Moderately high collector value. Perfect, brightly patterned specimens with undamaged umbilicus are heavily sought after by shell enthusiasts.
Condition Notes
Good condition. The shell is intact with minor wear along the outer margin and slight fading of the color patterns, graded as Good to Fine collectibility.
Interesting Facts
Sundial shells are specialized predators that feed exclusively on colonial anemones and sea anemones, using their radula to pierce the prey.
Ecological Role
Acts as a specialized predator controlling sea anemone populations in benthic communities. Not currently listed as endangered, but populations are sensitive to coastal habitat disruption.
Similar Species
Architectonica perspectiva (Clear Sundial) and other Architectonica species, which differ primarily in whorl count, cord sculpture, and color banding.
Beach Finding Tips
Look for sundial shells after heavy storms or rough surf on sandy tropical and subtropical beaches, particularly in the driftlines where small shells accumulate.