armigerous river snail

{{Short description|Species of gastropod}}

{{Speciesbox

| name = Armigerous river snail

| image = Naturalis Biodiversity Center - RMNH.MOL.175273 - Lithasia armigera (Say, 1821) - Pleuroceridae - Mollusc shell.jpeg

| status = VU

| status_system = IUCN2.3

| status_ref = {{cite iucn |author=Bogan, A.E. |date=1996 |title=Lithasia armigera |volume=1996 |page=e.T12127A3323815 |doi=10.2305/IUCN.UK.1996.RLTS.T12127A3323815.en |access-date=15 November 2021}}

| genus = Lithasia

| species = armigera

| authority = Say, 1821

| synonyms =

}}

The armigerous river snail or armored rocksnail, scientific name Lithasia armigera, is a species of freshwater snail with an operculum, an aquatic gastropod mollusk in the family Pleuroceridae. This species is endemic to the United States.