A revision of brain composition in Onychophora (velvet worms) suggests that the tritocerebrum evolved in arthropods |
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| Authors: | Georg Mayer Paul M Whitington Paul Sunnucks Hans-Joachim Pflüger |
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| Institution: | 1.Institute of Biology II: Animal Evolution & Development,University of Leipzig,Leipzig,Germany;2.Department of Anatomy and Cell Biology,University of Melbourne,Australia;3.School of Biological Sciences and Australian Centre for Biodiversity,Monash University,Melbourne,Australia;4.Institut für Biologie, Neurobiologie,Freie Universit?t Berlin,Berlin,Germany |
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| Abstract: | Background The composition of the arthropod head is one of the most contentious issues in animal evolution. In particular, controversy
surrounds the homology and innervation of segmental cephalic appendages by the brain. Onychophora (velvet worms) play a crucial
role in understanding the evolution of the arthropod brain, because they are close relatives of arthropods and have apparently
changed little since the Early Cambrian. However, the segmental origins of their brain neuropils and the number of cephalic
appendages innervated by the brain - key issues in clarifying brain composition in the last common ancestor of Onychophora
and Arthropoda - remain unclear. |
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