Growth patterns in Onychophora (velvet worms): lack of a localised posterior proliferation zone |
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| Authors: | Georg Mayer Chiharu Kato Björn Quast Rebecca H Chisholm Kerry A Landman Leonie M Quinn |
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| Affiliation: | 1.Institute of Biology II: Animal Evolution & Development,University of Leipzig,Leipzig,Germany;2.Institut für Evolutionsbiologie und ?kologie,Universit?t Bonn,Bonn,Germany;3.Department of Mathematics and Statistics,University of Melbourne,Victoria,Australia;4.Department of Anatomy and Cell Biology,University of Melbourne,Victoria,Australia |
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| Abstract: | Background During embryonic development of segmented animals, body segments are thought to arise from the so-called "posterior growth zone" and the occurrence of this "zone" has been used to support the homology of segmentation between arthropods, annelids, and vertebrates. However, the term "posterior growth zone" is used ambiguously in the literature, mostly referring to a region of increased proliferation at the posterior end of the embryo. To determine whether such a localised posterior proliferation zone is an ancestral feature of Panarthropoda (Onychophora + Tardigrada + Arthropoda), we examined cell division patterns in embryos of Onychophora. |
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