Holothuroidea - Apodida - Achistridae

Full reference: R. C. Gutschick, W. F. Canis, and K. G. Brill, Jr. 1967. Kinderhook (Mississippian) holothurian sclerites from Montana and Missouri. Journal of Paleontology 41(6):1461-1480

Belongs to Achistrum according to R. C. Gutschick et al. 1967

Sister taxa: Achistrum beckmanni, Achistrum brevis, Achistrum brevis, 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, UND 103; paratypes UND 144-145, UMo E-44-15, E-44-16

Ecology: epifaunal detritivore