Pseudoplanktic

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Fig. 1. Balloon and float chambers in pseudoplanktic forms. All specimens from the Gulf of Aqaba, Red Sea, Recent. SEM graphs. A-B: Cymbaloporetta sp. Lateral views of dissected specimens. Note tubular infolds of the float chamber canalizing the hatching from the umbilical cavity to the preseptal space under the apertures of the balloon chamber (arrows). C-D: Tetromphalus bulloides (d'Orbigny). Lateral views of dissected and intact specimens in their pseudoplanktic stage. E-G: T. bulloides in its benthic stage, showing open umbilicus, lateral, umbilical (ventral) and spiral (dorsal) views. a: aperture; bch: balloon chamber; flch: float chamber; fol: folium; u: umbilicus; (Hottinger, 2006; fig. 16 [1] CC/BY-NC-SA)

Definition

  • according to Hottinger (2006):

PSEUDOPLANKTIC - a life habit: benthic forms emigrate into the planktic realm prior to reproduction, a strategy to enhance the dispersion of a population. Pseudoplanktic foraminifera produce as a penultimate growth step a float-chamber followed by a balloon chamber with multiple apertures to release the hatching. As fossils and in recent sediments, pseudoplanktic foraminiferal shells are found in comparatively small numbers disseminated over all the ecological gradients of the photic zone.

See also

References

Hottinger (2006), Illustrated glossary of terms used in foraminiferal research. Carnets de Géologie, Memoir 2, ISSN 1634-0744



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