Achistrum

{{Short description|Extinct genus of sea cucumbers}}

{{Automatic taxobox

| image = Achistrum wheeleri.JPG

| taxon = Achistrum

| authority = Etheridge, 1881

}}

Achistrum is an extinct genus of sea cucumber which existed in Poland during the Triassic period, and the United States during the Carboniferous period.[http://app.pan.pl/archive/published/app16/app16-429.pdf Triassic Holothurian Sclerites from Tatra Mountains] Krystyna Zawidzka. It contains the species Achistrum nicholsoni and Achistrum ludwigi.