Document Detail

On core jakobids and excavate taxa: the ultrastructure of Jakoba incarcerata.
MedLine Citation:
PMID:  11456326     Owner:  NLM     Status:  MEDLINE    
The cellular organisation of the 'excavate' flagellate Jakoba incarcerata Bernard, Simpson and Patterson 2000 is described. Cells have one nucleus and dictyosome. The putative mitochondria lack cristae. Two flagella (anterior and posterior) insert anterior to the feeding groove. The posterior flagellum bears a dorsal vane. An 'anterior' microtubular root arises against the anterior basal body. Two main microtubular roots, left and right, and a singlet 'root' arise around the posterior basal body and support the groove. Non-microtubular fibres termed 'A', 'B', 'I', and 'composite' associate with the right root. A multilaminar 'C' fibre associates with the left root. The cytoskeleton of J. incarcerata indicates a common ancestry with other excavate taxa (i.e. diplomonads, retortamonads, heteroloboseids, 'core jakobids', Malawimonas, Carpediemonas, and Trimastix). Overall, J. incarcerata is most similar to (other) core jakobids, namely Jakoba libera, Reclinomonas, and Histiona. We regard J. incarcerata as a core jakobid and identify the group by the synapomorphy 'vanes restricted to dorsal side of the posterior flagellum'. The anterior root and position of the B fibre (and presence of dense inclusions in the cartwheels and a conscpicuous singlet root-associated fibre) in J. incarcerata are novel for core jakobids and argue for close relationships with Trimastix and/or Heterolobosea. The C fibre is similar in substructure to the costal fibre of parabasalids and it is possible that the structures are homologous.
A G Simpson; D J Patterson
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  The Journal of eukaryotic microbiology     Volume:  48     ISSN:  1066-5234     ISO Abbreviation:  J. Eukaryot. Microbiol.     Publication Date:    2001 Jul-Aug
Date Detail:
Created Date:  2001-07-17     Completed Date:  2002-03-27     Revised Date:  2009-11-19    
Medline Journal Info:
Nlm Unique ID:  9306405     Medline TA:  J Eukaryot Microbiol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  480-92     Citation Subset:  IM    
Protist Research Laboratory, School of Biological Sciences, University of Sydney, New South Wales, Australia.
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MeSH Terms
Eukaryota / classification,  genetics,  ultrastructure*
Evolution, Molecular
Microscopy, Electron

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