Holothuroidea - Apodida - Achistridae

Alternative combinations: Achistrulum nicholsoni, Achistrum (Achistrum) nicholsoni

Full reference: R. Etheridge. 1881. On the presence of scattered skeletal remains of Holothuroidea in the Carboniferous limestone series of Scotland. Proceeding of the Royal Physical Society of Edinburgh 6:183-198

Belongs to Achistrum according to A. Boczarowski 2001

Sister taxa: Achistrum beckmanni, Achistrum brevis, Achistrum brevis, Achistrum coloculum, Achistrum frizzelli, Achistrum gamma, Achistrum issleri, Achistrum longirostrum, Achistrum ludwigi, Achistrum monochordata, Achistrum multiperforatum, 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

Ecology: epifaunal detritivore