Scanning electron microscopy showed that particles, including symbiotic algae, non-symbiotic algae and latex spheres, entered digestive cells of European green hydra by two different types of phagocytosis: (i) they sank into crater-like formations of the digestive-cell surface; or (ii) they were enveloped by raised, funnel-like extensions of plasma membrane. The morphology selected did not depend on particle type: there was no evidence for specific recognition of symbiotic algae during phagocytosis.
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McNeil et al. (1982) studied this question.
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