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Body plan
A body plan (also written bodyplan), ''Bauplan'' (German plural ''Baupläne''), or ground plan is "an assemblage of morphological features shared among many members of a phylum-level group". The vertebrate body plan is one of many: invertebrates consist of many phyla.
This term, usually applied to animals, envisages a "blueprint" encompassing aspects such as symmetry, segmentation and limb disposition.
Body plans have historically been considered to have evolved in a flash in the Cambrian explosion, but a more nuanced understanding of animal evolution suggests the gradual development of body plans throughout the early Palaeozoic.
==History==
The history of the discovery of body plans can be seen as a movement from a worldview centred on the vertebrates, to seeing the vertebrates as one body plan among many. Among the pioneering zoologists, Linnaeus identified two body plans outside the vertebrates; Cuvier identified three; and Haeckel had four, as well as the Protista with eight more, for a total of twelve. For comparison, the number of phyla recognised by modern zoologists has risen to 35.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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