Phylogeny and biogeography of the "Australian" trichostomes (Ciliophora : Litostomata)

Cameron, Stephen L. and O'Donoghue, Peter J. (2004) Phylogeny and biogeography of the "Australian" trichostomes (Ciliophora : Litostomata). Protist, 155 2: 215-235. doi:10.1078/143446104774199600


Author Cameron, Stephen L.
O'Donoghue, Peter J.
Title Phylogeny and biogeography of the "Australian" trichostomes (Ciliophora : Litostomata)
Formatted title
Phylogeny and biogeography of the “Australian” trichostomes (Ciliophora: Litostomata)
Journal name Protist   Check publisher's open access policy
ISSN 1434-4610
1618-0941
Publication date 2004-06
Sub-type Article (original research)
DOI 10.1078/143446104774199600
Volume 155
Issue 2
Start page 215
End page 235
Total pages 21
Place of publication Jena, Germany
Publisher Urban und Fischer Verlag
Collection year 2004
Language eng
Subject C1
270308 Microbial Systematics, Taxonomy and Phylogeny
780105 Biological sciences
060301 Animal Systematics and Taxonomy
060309 Phylogeny and Comparative Analysis
320405 Medical Parasitology
300508 Parasitology
0605 Microbiology
1108 Medical Microbiology
Formatted abstract
The phylogenetic relationships of members of the ciliate class Litostomatea were determined by a molecular phylogeny using the small subunit of the ribosomal RNA (ssu-rRNA) gene and a morphological phylogeny based on ultrastructural analyses of the group. Molecular analyses consistently supported the monophyly of Trichostomatia, Entodiniomorphida and the “Australian” trichostomes but provided limited support for a monophyletic Vestibuliferida and Haptoria. The results of the morphological analyses depended on the way in which the dataset was treated: “unordered” and “ordered” recovered a monophyletic Trichostomatia, Haptoria and the “Australian” trichostomes but challenged the monophyly of Entodinimorphida and Vestibuliferida; “dollo” recovered a monophyletic Trichostomatia and Entodiniomorphida but at the cost of a greatly longer tree than either “unordered” or “ordered” datasets. The monophyly of each “Australian” trichostome family was supported in all analyses and by both approaches. These results suggest that the trichostome ciliates may have become associated with mammals in Gondwana with the “Australian” trichostome ciliates entering Australia with primitive herbivorous marsupials. Subsequent diversification of the “Australian” families was probably a result of dietary specialization and oral and cortical synapomorphies define each family. We decline at this time to erect a formal taxon name for the “Australian” trichostomes due to the instability of other superfamilial taxa within the Litosomatea and concerns about the stability of tree topology until a better taxon sample of litostome ciliates is available.
Keyword Microbiology
Ribosomal-RNA sequences
Capybara Hydrochoerus-hydrochaeris
Electron-microscope Investigations
Homalozoon-vermiculare stokes
Fine-structure
Dasytricha-ruminantium
Ordered characters
Phylum-ciliophora
Didinium-nasutum
Nov Litostomatea
Q-Index Code C1

 
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Created: Wed, 15 Aug 2007, 03:56:58 EST