New Zealand Eocene and Oligocene benthic foraminifera of the family Notorotaliidae

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Hornibrook, N. de B.; St. George, W.; Strong, C.P. 1996 New Zealand Eocene and Oligocene benthic foraminifera of the family Notorotaliidae. Lower Hutt: Institute of Geological & Nuclear Sciences. Institute of Geological & Nuclear Sciences monograph 12; New Zealand Geological Survey paleontological bulletin 69 45 p.

Abstract: This monograph reviews and revises the taxonomy and stratigraphic distribution of species of the notorotaliid genera, Notorotalia, Cribrorotalia, Discorotalia and Parrellina in the Eocene and Oligocene of New Zealand. It further proposes that the Subfamily Notorotaliinae be elevated to Family status: Notorotaliidae. The Family includes the four New Zealand genera cited above, and provisionally, the north Pacific genus, Porosorotalia. The twelve species of Notorotalia include the following eight described as new: N. bortonica (Middle Eocene); N. kaiata (Late Eocene); N. ruatangatae (Late Eocene); N. kiripakae (Late Eocene); N. aparimae (Early Oligocene); N. braxtonensis (Early Oligocene); N. kohaihae (Middle to Late Oligocene); N. praeserrata (Late Oligocene); also one new subspecies: N. stachei macrostachei (Middle Oligocene); and an ecophenotypic form of N. stachei, referred to as the ''Whaingaroa variant'' (Middle Oligocene). The seven species of Cribrorotalia include one new species, Cribrorotalia chattonensis (Late Oligocene). Discorotalia and Parrellina each are represented in the Eocene and Oligocene by a single species. Representative specimens from species populations are illustrated in 18 plates of SEM photomicrographs and 1 plate of stippleboard drawings. Comparison of juvenile individuals in growth series of some Notorotalia and Cribrorotalia species has led to improved understanding of the taxonomy of the group. The earliest known record of Notorotalia, from the Middle Eocene Porangan Stage, at about 45 Ma, predates the earliest record of Cribrorotalia, in middle Kaiatan (Late Eocene), by about 9 Ma. Therefore, the latter cannot represent the ancestral stock of the Notorotaliidae. (auth)

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