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Neurogenesis in myriapods and chelicerates and its importance for understanding arthropod relationships.
MedLine Citation:
PMID:  21672734     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
Several alternative hypotheses on the relationships between the major arthropod groups are still being discussed. We reexamine here the chelicerate/myriapod relationship by comparing previously published morphological data on neurogenesis in the euarthropod groups and presenting data on an additional myriapod (Strigamia maritima). Although there are differences in the formation of neural precursors, most euarthropod species analyzed generate about 30 single neural precursors (insects/crustaceans) or precursor groups (chelicerates/myriapods) per hemisegment that are arranged in a regular pattern. The genetic network involved in recruitment and specification of neural precursors seems to be conserved among euarthropods. Furthermore, we show here that neural precursor identity seems to be achieved in a similar way. Besides these conserved features we found 2 characters that distinguish insects/crustaceans from myriapods/chelicerates. First, in insects and crustaceans the neuroectoderm gives rise to epidermal and neural cells, whereas in chelicerates and myriapods the central area of the neuroectoderm exclusively generates neural cells. Second, neural cells arise by stem-cell-like divisions of neuroblasts in insects and crustaceans, whereas groups of mainly postmitotic neural precursors are recruited for the neural fate in chelicerates and myriapods. We discuss whether these characteristics represent a sympleisiomorphy of myriapods and chelicerates that has been lost in the more derived Pancrustacea or whether these characteristics are a synapomorphy of myriapods and chelicerates, providing the first morphological support for the Myriochelata group.
Authors:
Angelika Stollewerk; Ariel D Chipman
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Publication Detail:
Type:  Journal Article     Date:  2006-02-16
Journal Detail:
Title:  Integrative and comparative biology     Volume:  46     ISSN:  1540-7063     ISO Abbreviation:  Integr. Comp. Biol.     Publication Date:  2006 Apr 
Date Detail:
Created Date:  2011-06-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101152341     Medline TA:  Integr Comp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  195-206     Citation Subset:  -    
Affiliation:
Department of Zoology, University of Cambridge Downing Street, Cambridge CB2 3EJ, UK.
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