Williams, Mark; Schmidt, Daniela N.; Wilkinson, Ian P.; Miller, C. Giles; Taylor, Paul D.. 2006 The type material of the Miocene to Recent species of Globigerinoides sacculifer (Brady) revisited. Journal of Micropalaeontology, 25 (2). 153-156.
Abstract
The detailed test morphology of the type suite of Globigerinoides sacculifer (Brady) is illustrated for the first time since the species was identified in 1877. Fossil representatives of this species are a key index for oceanographic reconstruction of the Neogene and Quaternary tropics. The types of G. sacculifer, sourced from a loose 'chalk' block on a beach in New Ireland, Papua New Guinea, all bear a sac-like terminal chamber and are heavily calcified. They have undergone gametogenesis. Scanning electron microscopy identifies calcite fabrics of the test that were formed post-ontogeneticaly.
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