SYNOPSIS. The firm union of the shells of adult Gromia oviformis in plastogamous pairs is followed by gametogenesis and fertilization with the production of distinctive fusiform zygotes that undergo further transformation into amoebulae initially having hyaline radiate pseudopodia. The amoebulae emerge from the parental shells and probably initiate the asexual phase of the life cycle.
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Zach M. Arnold (1966) studied this question.
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