Fig. 1. Stereom formation in modern and fossil echinoderms. (A) A spine of the modern sea star Asterias with soft tissue removed, constructed of meshlike stereom. (B) An occular plate of the modern sea star Asterias with soft tissue removed, constructed of meshlike stereom. (C) Median cross section of the stylocone from the Middle Cambrian stylophoran ?Ceratocystis, showing stereom construction. (D) Detail of stereom from the inner face in external view of the stylocone from the Middle Cambrian stylophoran ?Ceratocystis. (E) Larval spicule of S. purpuratus with biomineralized stereom (calcite) dissolved away, showing the distribution of spicule matrix proteins. [(A) and (B) are used with permission from C. Sumrall; (C) and (D) are reprinted by permission from Macmillan Publishers Ltd. (Nature) (11), copyright (2005); (E) is reprinted from (27), copyright 1983, with permission from Elsevier.] Scale bars in (A) to (C), 500 µm; scale bar in (D), 100 µm; magnification of (E) is x3000. [View Larger Version of this Image (269K JPEG file)]

 

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