Abstract

Radiolarian faunas from seven localities of the well known Late Eocene Oamaru Diatomite were studied. All samples contained well preserved Radiolaria, generally of common or greater abundance, along with numerous sponge spicules and diatoms. Radiolarian faunal composition confirms a Late Eocene age for the Oamaru Diatomite. The Radiolaria are documented, with 24 new species described and three new genera erected. The new species are Tricorporisphaera bibula, Zealithapium oamaru (Actinomicea), Plectodiscus runanganus (Porordiscidae), Plannapus hornibrooki, P. mauricei, Spirocyrtis greeni (Artostrobiidae), Botryocella pauciperforata (Cannobotryidae), Carpocanopsis ballisticum (Carpocaniidae), Vertotholus doigi, V. edwardsi, V. mackayi (Neosciadiocapsidae), Lithomelissa lautouri, Velicucullus fragilis (Plagoniidae), Lamprocyclas particollis (Pterocorythidae), Artophormis fluminafauces, Eucyrtidium ventriosum, Eurystomoskevos cauleti, Lophocyrtis (L.) haywardi, Lychocanium alma, L. waiareka, L. waitaki, Pterosyringium hamata, Sethochytris cavipodis and Thyrsocyrtis (T?) pinguisicoides (Theoperidae). The new genera are Tricorporisphaera, Zealithapium (Actinommidae), and Verutotholus (Neosciadiocapsidae). Emendations are proposed to the family Neosciadiocapsidae and the genus Eurystomoskevos, and Pterosyringium is raised from subgeneric to generic level.

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