Four-banded Marginella (Marginella bidentata or Pustulatella)
Phylum: Mollusca, Class: Gastropoda, Order: Neogastropoda, Family: Marginellidae, Genus: Marginella, Species: Marginella bidentata · Marginellidae (Margin shells) · Gastropod (univalve), whole shell, smooth and glossy ovate shape
Species
Marginella bidentata
Shell Type
Gastropod (univalve), whole shell, smooth and glossy ovate shape
Family
Marginellidae (Margin shells)
Size
Approximately 10-15 millimeters, which is standard for many small marginella species.
Color & Pattern
Glossy white or cream-colored porcelain-like base decorated with distinct, evenly spaced transverse orange-brown bands.
Rarity
Common to Uncommon, depending on the specific collecting region.
Habitat
Shallow subtidal waters, sand flats, and coral sand environments, often buried just beneath the surface during the day.
Geographic Range
Warm tropical and subtropical waters, notably parts of the Caribbean and Western Atlantic.
Description
A miniature, highly polished gem of a shell. It features a sleek ovate form with a high gloss finish that mimics porcelain, adorned with striking reddish-brown or orange bands crossing the dorsal side.
Key Features
Smooth, glossy porcelain-like exterior, distinct transverse color banding, and a narrow aperture with folds (plaques) on the inner lip.
Collector Value
Low to moderate commercial value; popular among miniature shell specialists due to their glossy finish and colorful banding.
Condition Notes
Good condition with high gloss and intact color bands; minor natural wear near the apex.
Interesting Facts
Marginella snails are active carnivores and scavengers, gliding through sand in search of small worms and detritus.
Ecological Role
Functions as a micro-predator and scavenger in sandy benthic communities, helping maintain marine substrate health.
Similar Species
Other Marginella species such as Marginella guttata or Prunum species, distinguished primarily by spotting patterns rather than distinct bands.
Beach Finding Tips
Sift through shell driftlines on tropical sandy beaches or examine fine shell grit washed ashore after storms.