Dettmann, M.E.; Pocknall, D.T.; Romero, E.J.; Zamaloa, M del C. 1990 Nothofagidites Erdtman ex Potonie, 1960 : a catalogue of species with notes on the paleogeographic distribution of Nothofagus Bl. (Southern Beech). Lower Hutt: New Zealand Geological Survey. New Zealand Geological Survey paleontological bulletin 60. 79 p.
Abstract:
Nothofagidites Erdtman ex Potonie, 1960 is surveyed and reassessed on the basis of type specimens of 36 validly named species allocated to the genus. The status of each type is indicated and they are described and illustrated by photomicrographs and line drawings. The genus incorporates oblate, stephanoaperturate pollen having meridionally elongated colpi with or without marginal thickenings, and a tectate exine with surficial grana, spinulae, spinae, or coni. Species transferred to the genus from Nothofagus comprise: N. incrassatus (Cookson) Dettmann, comb. nov. and N. longispinosus (Couper) Pocknall, comb. nov. Nothofagidites makinseini Kedves, 1964 is excluded from the genus and lectotypes are designated for five species. Pollen evidence indicates evolution of Nothofagus during the early Campanian in the southern Gondwana region comprising southern South America, and Australia. Diversification and introduction of brassii , menziesii , and fusca pollen producers occurred in southern South America and Western Antarctica during the Maastrichtian, some 5-20 Ma prior to their introduction into the Australasian region. Here there was further diversification during early and middle Tertiary time of brassii pollen, the parental sources of which were confined to New Guinea and New Caledonia after the close of the Tertiary.
