Globorotaloides hexagonus (Natland, 1938)

Globorotaloides hexagonus (Fig. 28) is a rare species which occurs mainly in equatorial and tropical ocean areas, and does not exceed a relative abundance of 1% in a few samples from subtropical environments. It shows the closest relationships with mean sea surface temperatures and has a distinct relative abundance maximum in areas with water temperatures near 15 °C at 200 m depth. It prefers areas with modest seasonality in surface water temperatures and has broad tolerances for other physical parameters. The relationships argue for a deeper water habitat of this species.

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Figure 28: Globorotaloides hexagonus (Natland, 1938). Plots of relative abundance vs. selected physical parameters and latitude. For preferences in numeric form see appendix.

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