Scientific classification
Superdomain: Neomura
Domain: Eukaryota
(unranked): Opisthokonta
(unranked) Holozoa
(unranked) Filozoa
Kingdom: Animalia
Subkingdom: Eumetazoa
(unranked): Bilateria
(unranked): Protostomia
Superphylum: Lophotrochozoa
Phylum: Mollusca
Subphylum: Conchifera
Class: Gastropoda
Subclass: Orthogastropoda
Order: Littorinimorpha
Superfamily: Cypraeoidea
Family: Cypraeidae
Subfamily: Luriinae
Tribe: Austrocypraeini
Genus: Trona
Species: T. stercoraria

Specimens from Senegal, Angola, Senegal, Cameroon, Gabon

From my collection

via Flickr https://flic.kr/p/2htexjq