Artiopoda - Corynexochida - Styginidae
Full reference: T. Kobayashi and T. Hamada. 1974. Silurian trilobites of Japan in comparison with Asian, Pacific and other faunas. Palaeontological Society of Japan Special Papers 18:1-155
Parent taxon: Bumastus according to T. Kobayashi and T. Hamada 1974
Sister taxa: Bumastus (Bumastus), Bumastus agmakros, Bumastus barriensis, Bumastus comes, Bumastus cuniculus, Bumastus dayi, Bumastus decipiens, Bumastus dispassus, Bumastus graftonensis, Bumastus holei, Bumastus indeterminatus, Bumastus insignis, Bumastus ioxus, Bumastus kattoi, Bumastus lioderma, Bumastus longiops, Bumastus niagarensis, Bumastus orbicaudatus, Bumastus porrectus, Bumastus rowleyi, Bumastus sakoi, Bumastus tenuis, Bumastus trentonensis, Bumastus vulsus
Subtaxa: Bumastus (Bumastella) aspera Bumastus (Bumastella) bipunctatus Bumastus (Bumastella) spiculus
Ecology: nektobenthic carnivore
Distribution: found only at Loc. 3. Ys 15. Gomi Quarry (Silurian of Japan)