Radiolaria - Nassellaria - Hsuidae

Full reference: E. A. Pessagno, Jr. and P.A. Whalen. 1982. Lower and Middle Jurassic Radiolaria (multicyrtid Nassellariina) from California, east-central Oregon and the Queen Charlotte Islands, B.C. Micropaleontology 28(2):111-169

Belongs to Hsuum according to Pessagno and Whalen 1982

Sister taxa: Hsuum acutum, Hsuum altile, Hsuum amabile, Hsuum arabicum, Hsuum arenaense, Hsuum belliatulum, Hsuum brevicostatum, Hsuum cuestaense, Hsuum feliformis, Hsuum gratum, Hsuum lucidum, Hsuum lupheri, Hsuum matsuokai, Hsuum maxwelli, Hsuum mclaughlini, Hsuum mirabundum, Hsuum modicum, Hsuum optimum, Hsuum parasolense, Hsuum parvulum, Hsuum plectocostatum, Hsuum robustum, Hsuum rosebudense, Hsuum rutogense, Hsuum tamanense

Type specimen: USNM 307236. Its type locality is Queen Charlotte Islands, B.C., Maude Formation (Locality 534), which is in a Pliensbachian marine lime mudstone in the Maude Formation of Canada.

Ecology: passively mobile planktonic omnivore