Titlebook: Advances in the Biology of Turbellarians and Related Platyhelminthes; Proceedings of the F Seth Tyler Conference proceedings 1986 Dr W. Jun

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An ultrastructural and cytochemical study of the digestive system in , (Turbellaria, Acoela)The central parenchyma in . consists of multifunctional cells. These cells digest food material intracellularly, can effect extracellular digestion through release of digestive enzymes by cell lysis and clasmatosis, and synthesize reserve nutritional substances.

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Overview: 978-94-009-4810-5

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Dr W. Junk Publishers, Dordrecht 1986

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Jerry J. Sweet,Cynthia Westergaardn those groups where these systems and mechanisms are evolutionarily most primitive. Here, such variety can involve the basic body plan of a given phylum and the types of morphogenesis characteristic of it. This correlation provides a new criterion of evolutionary primitive-ness, namely, the criteri

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Contemporary Approaches to Outdoor Learningoon of the Nemertodermatida, a group of primitive flatworms, indicates that the Platyhelminthes evolved from forms characterized by the primitive type of metazoan sperm and by the primitive mode of fertilization, implying the release of sperm freely into sea water..The occurrence of aberrant types o

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