A revision of brain composition in Onychophora (velvet worms) suggests that the tritocerebrum evolved in arthropods
Georg Mayer, Paul M Whitington, Paul Sunnucks, Hans-Joachim Pflueger
BMC EVOLUTIONARY BIOLOGY | BMC | Published : 2010
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. RESULTS: Using immunolabelling ..View full abstract
Awarded by German Research Foundation (DFG)
This work was supported by a grant from the German Research Foundation (DFG) to GM (Ma 4147/3-1). GM is a Research Group Leader supported by the Emmy Noether Programme of the DFG.