Abstract
The variation of external and internal metric characters of Pellatispira glabra, a rotaliid foraminifer, has been statistically analyzed. The study reveals that the megalospheric generation of this species is dimorphic. After considering ecologic and other factors, it is concluded that the above generation is schizo-gamont and owes its dimorphism to a growth differential arising in course of a biannual schizogonic cycle. A model explaining the life cycle of the species is proposed.
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