作者: Dietrich Schlichter
DOI: 10.1007/978-3-642-51593-4_8
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摘要: During the course of metazoan evolution there was a tendency for reduction in external body surface area so that exchange surfaces were localized within protected interior body. The Cnidaria stand at beginning Eumetazoa and show, several respects, certain unique features, e.g. has not yet taken place; on contrary, is an increase outer surface. Arguments evolutionary success laminate organization cnidarians are, part, subject matter this chapter.