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Functional Morphology and Diversity$
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Les Watling and Martin Thiel

Print publication date: 2013

Print ISBN-13: 9780195398038

Published to Oxford Scholarship Online: May 2015

DOI: 10.1093/acprof:osobl/9780195398038.001.0001

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Evolution of Crustacean Appendages

Evolution of Crustacean Appendages

Chapter:
(p.34) 2 Evolution of Crustacean Appendages
Source:
Functional Morphology and Diversity
Author(s):

Joachim T. Haug

Andreas Maas

Carolin Haug

Dieter Waloszek

Publisher:
Oxford University Press
DOI:10.1093/acprof:osobl/9780195398038.003.0002

The evolutionary history of the postantennular appendages of Crustacea is reviewed, including information on limb development early in the evolutionary lineage of this taxon. Further changes of the appendages and the effects on the feeding and locomotory system are followed along the evolutionary lineage of the crustaceans into the crown group, Eucrustacea. Acknowledging these changes is crucial to understand the high degree of variation of modern crustacean limb morphology and to overcome difficulties in recognizing their common features in terms of homology and relationships. Other strategies that evolved subsequently in eucrustacean ingroups include the arrangement of limbs into functional units and consequent changes in their morphologies, and the high modification of limbs for very specific purposes, for example, reproduction/copulation. Lastly, limbs are also lost repeatedly in various taxa. Reconstructing the evolutionary history of limbs along different crustacean lineages is still a major task for future research.

Keywords:   crustacean appendage, evolution, Crustacea, Orsten crustaceans, endopod, exopod, rami

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