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As the largest predators of the Cambrian seas, the anomalocaridids had an important impact in structuring the first complex marine animal communities, but many aspects of anomalocaridid morphology, diversity, ecology, and affinity remain unclear owing to a paucity of specimens. Here we describe the anomalocaridid Hurdia, based on several hundred specimens from the Burgess Shale in Canada. Hurdia possesses a general body architecture similar to those of Anomalocaris and Laggania, including the presence of exceptionally well-preserved gills, but differs from those anomalocaridids by possessing a prominent anterior carapace structure. These features amplify and clarify the diversity of known anomalocaridid morphology and provide insight into the origins of important arthropod features, such as the head shield and respiratory exites.

Original publication

DOI

10.1126/science.1169514

Type

Journal article

Journal

Science

Publication Date

20/03/2009

Volume

323

Pages

1597 - 1600

Keywords

Animals, Arthropods, Biological Evolution, Canada, Extremities, Fossils, Geologic Sediments, Invertebrates, Mouth