Phylogenetic analysis of small-subunit ribosomal RNA gene sequences for gymnamoebae of the families Vexilliferidae, Paramoebidae, and Vannellidae identified two distinct lineages that are supported by gross morphological characters. This analysis indicates that paramoebids and vexilliferids are part of one lineage and that vannellids belong to another. A shared morphological character unique to the paramoebid/vexilliferid lineage members is the presence of dactylopodiate subpseudopodia. However, cell surface structures, normally used for taxonomic discrimination, range from simple hair-like filaments without any apparent organization (Neoparamoeba), to hexagonal glycostyles (Vexillifera) or more elaborate surface scales (Korotnevella). Taxa within the vannellid lineage all lack subpseudopodia and appear flabellate, spatulate or linguiform while in locomotion. Cell surface structures of taxa within the vannellid lineage range from filaments organized into hexagonal arrays (Lingulamoeba, Platyamoeba) to pentagonal glycostyles (Clydonella, Vannella). Vannellid lineage members of the genera Clydonella and Lingulamoeba were studied at the level of electron microscopy. Unique cell surface features validate these as genera distinct from Vannella and Platyamoeba. Genetic and ultrastructural data are used to discuss the phylogenetic interrelationships for the taxa studied.
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1 May 2003
Two New Small-Subunit Ribosomal RNA Gene Lineages within the Subclass Gymnamoebia
MICHAEL T. PEGLAR,
LINDA A. AMARAL ZETTLER,
O. ROGER ANDERSON,
THOMAS A. NERAD,
PATRICK M. GILLEVET,
THOMAS E. MULLEN,
SALVATORE FRASCA Jr.,
JEFFREY D. SILBERMAN,
CHARLES J. O’KELLY,
MITCHELL L. SOGIN
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The Journal of Eukaryotic Microbiology
Vol. 50 • No. 3
May 2003
Vol. 50 • No. 3
May 2003
Dactylopodia
glycostyles
gymnamoebae
Paramoebidae
parasome
protist
scales