单词	metameric
释义	metameric /ˌmɛtəˈmɛrɪk / adjective Zoology Relating to or consisting of several similar segments or somites.Indeed, there is: somites in metameric animals usually form sequentially from a posterior growth zone, a process found again in all three branches of the bilaterians.... The term iteration is used to denote processes that result in both metameric segments and repeated ectodermal skeletal structures. Notably, the oldest known Early Cambrian chordate Yunnanozoon had its metameric muscular units located dorsally of the notochord, although its body was laterally compressed. Derivatives metamer /ˈmɛtəmə / noun ... While most vegetative metamers have short internodes, metamers that form at the end of the vegetative phase have elongated ones. Although we did not monitor leaf loss, we did not find a differential influence of ozone on internode length and number of metamers, since both of these parameters changed in parallel to shoot length. Finally, a linear relationship was established between the total number of extended metamers per branch in year 2 and the number of axillary annual shoots developed from these metamers in year 3. metamerically adverb metamerism /mɪˈtamərɪz(ə)m / noun ... On the other hand, we cannot rule out that full metamerism evolved as a progressively coordinated repetition of organs and intermediate situation can still exist in extant organisms. Tagmosis can ultimately lead to the outright fusion of neighbouring segments and the loss of apparent metamerism, as seen for the arthropod head. Most provocative of all the Ediacaran forms are those exhibiting real or apparent metamerism.
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