https://dx.doi.org/10.1126/sciadv.aav3875

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Publication Title

Exceptional Preservation of Mid-Cretaceous Marine Arthropods and the Evolution of Novel Forms via Heterochrony

Document Type

Article

Publication Date

4-24-2019

Abstract

Evolutionary origins of novel forms are often obscure because early and transitional fossils tend to be rare, poorly preserved, or lack proper phylogenetic contexts. We describe a new, exceptionally preserved enigmatic crab from the mid-Cretaceous of Colombia and the United States, whose completeness illuminates the early disparity of the group and the origins of novel forms. Its large and unprotected compound eyes, small fusiform body, and leg-like mouthparts suggest larval trait retention into adulthood via heterochronic development (pedomorphosis), while its large oar-like legs represent the earliest known adaptations in crabs for active swimming. Our phylogenetic analyses, including representatives of all major lineages of fossil and extant crabs, challenge conventional views of their evolution by revealing multiple convergent losses of a typical “crab-like” body plan since the Early Cretaceous. These parallel morphological transformations may be associated with repeated invasions of novel environments, including the pelagic/necto-benthic zone in this pedomorphic chimera crab.

Publication

Science Advances

Publisher

American Association for the Advancement of Science

Volume

5

Issue

4

Department

College of Communication and Design

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial 4.0 License

Comments

Submitted 2 October 2018 / Accepted 6 March 2019 / Published 24 April 2019 / doi: 10.1126/sciadv.aav3875

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