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Early events in sea urchin metamorphosis, description and analysis

Cameron, R. Andrew and Hinegardner, R. T. (1978) Early events in sea urchin metamorphosis, description and analysis. Journal of Morphology, 157 (1). pp. 21-31. ISSN 0362-2525. doi:10.1002/jmor.1051570103.

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The larval epithelium of the sea urchin, Lytechinus pictus, consists of squamous cells and bands of columnar epithelial cells bearing cilia. During metamorphosis this tissue undergoes a series of rapid, complex changes. Through the scanning and transmission electron microscope, we describe and analyse these changes. The changes can be divided into three steps. (1) The larval arms bend away from the left side of the larva, exposing the urchin rudiment. Cells which are identical to smooth muscle cells are in a position to bring about this bending. (2) The squamous epithelial cells assume a cuboidal shape. This change in shape results in the collapse of the larval epithelium onto the presumptive aboral surface. These cells possess a subapical band of microfilaments. The cellular shape change but not the bending of the arms is reversibly inhibited by Cytochalasin B. These observations suggest a mechanism for this change. (3) The former lining of the vestibule of the urchin rudiment comes to lie over the collapsed larval tissue and forms the adult epithelium. At this point, after only one hour, the larva has assumed the external shape of an adult sea urchin.

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Cameron, R. Andrew0000-0003-3947-6041
Additional Information:© 1978 Wiley-Liss, Inc. This research was supported by grants from the National Science Foundation.
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Issue or Number:1
Record Number:CaltechAUTHORS:20121023-084749639
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Official Citation:Cameron, R. A. and Hinegardner, R. T. (1978), Early events in sea urchin metamorphosis, description and analysis. J. Morphol., 157: 21–31. doi: 10.1002/jmor.1051570103
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35021
Deposited By: Tony Diaz
Deposited On:24 Oct 2012 19:39
Last Modified:09 Nov 2021 23:12

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