Twenty-three species of the Trochaclididae (15 new species) are record
ed, 17 from the New Zealand region, five from Australia, and one from
New Caledonia. These taxa are referred to Trochaclis Thiele, 1912 (Ear
ly Miocene-Recent), Acremodonta Marshall, 1983 (Recent), Acremodontina
gen. nov. (Early Miocene-Recent), and Austrotrochaclis gen. nov. (Rec
ent). Trochaclidid radulae with central and lateral teeth that are str
ongly differentiated from the marginal teeth are recorded for the firs
t time.