Combining embryology and paleontology:: origins of the anterior-posterior axis in echinoids

被引:18
作者
Saucède, T
Mooi, R
David, B
机构
[1] CNRS, UMR 5025, Lab Geodynam Chaines Alpines, F-38400 St Martin Dheres, France
[2] CNRS, UMR 5561, F-21000 Dijon, France
[3] Calif Acad Sci, San Francisco, CA 94118 USA
关键词
developmental constraints; embryology; exocyclism; irregular echinoids;
D O I
10.1016/j.crpv.2003.09.017
中图分类号
Q91 [古生物学];
学科分类号
0709 ; 070903 ;
摘要
The tendency of the periproct to move outside the apical system occurred in eight independent sea urchins lineages, but only one succeeded. The origin of the anterior-posterior axis in irregular echinoids results from that successful attempt, and is primarily achieved by eccentricity of the periproct. The mechanism by which this occurs is best understood through synthesis of data from embryology, paleontology, and phylogenetics. In irregular echinoids, the complete escape of the periproct from the apical system (exocyclism) is a consequence of changes in the embryological sequence that governs periproctal eccentricity. The adaptative significance of this change is discussed. (C) 2003 Academie des sciences. Published by Editions scientifiques et medicales Elsevier SAS. All rights reserved.
引用
收藏
页码:399 / 412
页数:14
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