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Nature 421, 120-121 (9 January 2003) | doi:10.1038/421120a
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Developmental biology: A larval revelation
Thurston Lacalli
Abstract
Identification of the previously unknown larval forms of the sea lilies, a group of marine invertebrates, is a refreshing reminder of the value of descriptive science in evolutionary studies.
The stalked crinoids, or sea lilies, are generally accepted as the most ancient of living echinoderms, with a fossil record extending back some 500 million years, almost to the base of the Palaeozoic1, 2. They live in deep water, and are difficult to collect in good enough condition for laboratory study.
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