Janulum imago Kelly & Van Soest, 2015 is described and compared with the genus type J. spinispiculum (Carter, 1876) from the North Atlantic. Janulum was also recorded from the Late Eocene Oamaru Diatomite of southern New Zealand in 1892, but was misidentified as genus Plocamia Schmidt (Order Poecilosclerida Topsent, Family Microcionidae Carter). Fossil species Janulum princeps Kelly & Van Soest, 2015 is also described herein and represents the first record of this North Atlantic-Arctic Ocean genus in the Southern Hemisphere. The validity of J. filholi (Topsent, 1890), the second and only other North Atlantic species currently assigned to Janulum, is considered in the context of J. spinispiculum and the new species J. imago.

Kelly, M., Erpenbeck, D., Morrow, C., Van Soest, R. (2015) First record of a living species of the genus Janulum (Class Demospongiae) in the Southern Hemisphere. Zootaxa 3980 (2): 255–266.