Reverse pebblesnail

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Reverse pebblesnail
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Gastropoda
(unranked): clade Caenogastropoda
clade Hypsogastropoda
clade Littorinimorpha
Superfamily: Truncatelloidea
Family: Hydrobiidae
Genus: Somatogyrus
Species: S. alcoviensis
Binomial name
Somatogyrus alcoviensis
Krieger, 1972

The reverse pebblesnail, scientific name Somatogyrus alcoviensis, was a species of small freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.

This species was endemic to the United States. It is now extinct.