Holothuroidea - Apodida - Achistridae

Full reference: R. C. Gutschick. 1959. Lower Mississippian holothurian sclerites from the Rockford Limestone of northern Indiana. Journal of Paleontology 33:130-137

Belongs to Achistrum according to R. C. Gutschick 1959

Sister taxa: Achistrum beckmanni, Achistrum brevis, Achistrum coloculum, Achistrum frizzelli, Achistrum gamma, Achistrum issleri, Achistrum longirostrum, Achistrum ludwigi, Achistrum monochordata, Achistrum multiperforatum, Achistrum nicholsoni, Achistrum permianum, Achistrum pulchrum, Achistrum triassicum, Achistrum tuto, Achistrum varicum, Achistrum (Achistrum) brownwoodensis, Achistrum (Cancellrum) bicordata, Achistrum (Cancellrum) pilgrimi, Achistrum (Cancellrum) meltonensis, Achistrum (Cancellrum) britanica, Achistrum (Cancellrum) warboysensis, Achistrum (Cancellrum) trichordata, Aduncrum cordatum

Type specimen: Holotype USNM 137013, paratypes USNM 137014, 137015, 137016. Its type locality is Meadel Ditch Quarry, which is in a Kinderhookian offshore mudstone/limestone in the Rockford Limestone Formation of Indiana.

Ecology: epifaunal detritivore