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1 Technische Universität Berlin, Sekretariat ACK 14, Ackerstrasse 71-76, 13355 Berlin, Germany
2 Nanjing Institute of Geology and Palaeontology, Nanjing 210008, China
3 Technische Universität Berlin, Sekretariat EB 10, Ernst-Reuter-Platz 1, 10587 Berlin, Germany
Although knowledge of exceptional Cambrian fossil Lagerstätten has increased dramatically, relatively little information has been uncovered about the early ontogeny of ancient Metazoa. Here we describe new phosphatized eggs and embryos, partly indicating germ band formation, and the earliest known larvae of early bilaterians. Developmental sequences are reconstructed for Pseudooides- and tetramerous-type embryos. Together with these developmental sequences, patterns of germ band formation, irregular "radial" cleavage types, and unciliated larva with serial divisions and a posterior segment indicate affinities with protostomes, most probably within an ancestral arthropodan lineage.
Key Words: Yangtze platform • Cambrian • embryos • larvae • ontogeny
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