Dianchicystis is an extinct genus of vetulocystid deuterostome.

It was found in Jianshan, China, near Haikou, in the Cambrian Qiongzhusi Formation.

[2] It is disinguished from Vetulicocystis by an anterior cone that has ribs that are not arranged in platelets, as well as a tapering "tail" (posterior section) with oblique striations.

The posterior section has weakly developed furrows, possibly indicating segmentation.

This article related to a Cambrian animal is a stub.