Toxolasma cylindrellus

{{Short description|Species of bivalve}}

{{Speciesbox

| image = Toxolasma cylindrellus.jpg

| image_caption =

| status = CR

| status_system = IUCN3.1

| status_ref = {{cite iucn |author=Cummings, K. |author2=Cordeiro, J. |date=2012 |title=Toxolasma cylindrellus |volume=2012 |page=e.T22013A2781049 |doi=10.2305/IUCN.UK.2012.RLTS.T22013A2781049.en |access-date=14 November 2021}}

| status2 = CITES_A1

| status2_system = CITES

| status2_ref = {{Cite web|title=Appendices {{!}} CITES|url=https://cites.org/eng/app/appendices.php|access-date=2022-01-14|website=cites.org}}

| genus = Toxolasma

| species = cylindrellus

| authority = (Lea, 1868)

| synonyms = Carunculina cylindrellus (Lea, 1868)

}}

Toxolasma cylindrellus, the pale lilliput naiad, pale lilliput pearly mussel, or pale lilliput, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. Its host is the northern studfish.{{cite journal |last1=Ornes |first1=Stephen |title=The Golden Riffleshell's Appalachian Road Trip |journal=Science News |date=1 August 2020 |volume=198 |issue=2 |pages=23–27 |url=https://www.sciencenewsdigital.org/sciencenews/august_1__2020 |access-date=4 August 2020|url-access=subscription}}