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Phylogenetic and morphological diversity of novel soil cercomonad species with a description of two new genera (Nucleocercomonas and Metabolomonas).
- Source :
-
Protist [Protist] 2012 Jul; Vol. 163 (4), pp. 495-528. Date of Electronic Publication: 2012 Apr 26. - Publication Year :
- 2012
-
Abstract
- Cercomonads are important components of microbial food webs in soils and aquatic sediments. Here, we investigated the general morphology, behaviour, life cycle and 18S rDNA phylogeny of cercomonad cultures from a German grassland soil habitat. We describe ten new species including two new genera from 23 strains. Three Cercomonas, two Eocercomonas and three Paracercomonas species are described. Based on large phylogenetic distance and distinct morphology, we erect two novel clade B genera near the root of the cercomonad tree. Nucleocercomonas nov. gen. bears a number of characters unusual for cercomonads: Its anterior flagellum is extremely long, it mostly does not glide, and in its most frequent life stage the cell body does not attach to the substratum, but produces unattached pseudopodia. Furthermore, it has a unique nucleus with a peripheral nucleolus that attaches to the nuclear envelope opposite the basal body connection. Metabolomonas nov. gen. is extremely metabolic. It is characterized by a very high beating frequency of the anterior flagellum, fast gliding, rapid changes in shape and strong cytoplasmic streams. A new genus Brevimastigomonas is erected for the previously described species Paracercomonas anaerobica. The general morphology of cercomonad species often does not correspond with their phylogenetic position: closely related species may have a very different morphology.<br /> (Copyright © 2012 Elsevier GmbH. All rights reserved.)
- Subjects :
- Cell Nucleolus ultrastructure
Cell Nucleus ultrastructure
Cercozoa cytology
Cercozoa genetics
Cluster Analysis
DNA, Protozoan chemistry
DNA, Protozoan genetics
DNA, Ribosomal chemistry
DNA, Ribosomal genetics
Flagella physiology
Genes, rRNA
Germany
Locomotion
Microscopy
Molecular Sequence Data
Phylogeny
RNA, Protozoan genetics
RNA, Ribosomal, 18S genetics
Sequence Analysis, DNA
Cercozoa classification
Cercozoa isolation & purification
Soil parasitology
Subjects
Details
- Language :
- English
- ISSN :
- 1618-0941
- Volume :
- 163
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Protist
- Publication Type :
- Academic Journal
- Accession number :
- 22541864
- Full Text :
- https://doi.org/10.1016/j.protis.2012.02.002