LATE CRETACEOUS AND TERTIARY APORRHAID GASTROPODS FROM THE SOUTHERN RIM OF THE PACIFIC-OCEAN

The new subfamily Struthiopterinae is proposed for the aporrhaid gastr opods occurring in the Late Cretaceous-early Tertiary Weddellian Provi nce along the southern margin of the Pacific. The following genera are placed within the Struthiopterinae: Struthioptera Finlay and Marwick, 1937; Austroaporrhais n. gen.; and Struthiochenopus n. gen. The tempo ral and biogeographic distribution of members of Struthiopterinae show a similar pattern to other Southern Hemisphere groups of Late Cretace ous and early Cenozoic molluscs with initial disappearance from the we stern Australasia of the Weddellian Province by the Paleocene white su rviving in Antarctica until the late Eocene and eventually disappearin g in southern South America during the early Miocene. Also included in this paper is a reappraisal of the species assignable to these genera from Late Cretaceous and early Tertiary of New Zealand, Antarctica, a nd southern South America together with the description of bye new spe cies. The following new species of the Struthiopterinae are described: Austroaporrhais larseni n. sp., A. stilwelli n. sp., A. dorotensis n. sp., Struthiochenopus antarcticus n. sp., and S. philippii n. sp.