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Two New Small‐Subunit Ribosomal RNA Gene Lineages within the Subclass Gymnamoebia
Author(s) -
PEGLAR MICHAEL T.,
ZETTLER LINDA A. AMARAL,
ANDERSON O. ROGER,
NERAD THOMAS A.,
GILLEVET PATRICK M.,
MULLEN THOMAS E.,
FRASCA SALVATORE,
SILBERMAN JEFFREY D.,
O'KELLY CHARLES J.,
SOGIN MITCHELL L.
Publication year - 2003
Publication title -
journal of eukaryotic microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.067
H-Index - 77
eISSN - 1550-7408
pISSN - 1066-5234
DOI - 10.1111/j.1550-7408.2003.tb00122.x
Subject(s) - biology , lineage (genetic) , phylogenetic tree , evolutionary biology , ribosomal rna , phylogenetics , taxon , gene , genetics , ecology
. 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 (Neo‐paramoeba) , to hexagonal glycostyles (Vexillifera) or more elaborate surface scales (Korotnevella) . Taxa within the vannellid lineage all lack subpseudopodia and appear flabellate, spatulate or linguif'orm while in locomotion. Cell surface structures of taxa within the vannellid lineage range from filaments organized into hexagonal arrays (Lingulamoeba, Platyamoeba) to pentagonal glycostyles (Cly‐donella, 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.