Geoplana diemenensis Dendy, 1894 Artioposthia diemenensis, also known as Van Diemen's flatworm, is a species of land planarian in the tribe Caenoplanini.

It has been found in southern Australia, including Tasmania.

[1] Artioposthia diemenensis is generally flat and broad, sloping inwards at its ends.

The backside is a sepia brown color with some darker stripes running down; the entire backside is covered in whitish speckles.

This flatworm- (or platyhelminth-) related article is a stub.