Phylogenetic position of freshwater and marine Sigmoidea species: introducing a marine hyphomycete Halosigmoidea gen. nov. (Halosphaeriales)
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E.B. Gareth Jones
Abstract
The aquatic hyphomycete genus Sigmoidea, with freshwater and marine representatives, is re-examined at the morphological and molecular levels. Currently six species are accepted, four from freshwater habitats (S. prolifera, S. aurantiaca, S. contorta, S. praelonga) and two marine species (S. marina, S. luteola). Phylogenetic analyses of the ribosomal small subunit rRNA gene sequences of freshwater and marine Sigmoidea species indicate that the marine species are distantly placed from the freshwater species, S. prolifera and Pseudosigmoidea cranei. The latter species are placed in the Dothideomycetes, in sister clades, with 81% bootstrap support. The phylogenetic placement of both marine Sigmoidea species, inferred from large subunit rRNA gene sequences, was within the genus Corollospora (Halosphaeriales, Sordariomycetes, Pezizomycotina). An undescribed Sigmoidea species isolated from the Baltic Sea and one previously incorrectly identified as S. marina from Japan (S. parvula sp. nov.) formed a clade together with Corollospora quinqueseptata and Varicosporina ramulosa, and were located in a sister group to S. luteola and S. marina. Based on morphological and phylogenetic evidence, Halosigmoidea gen. nov. is proposed to accommodate the three marine Sigmoidea species (S. luteola, S. marina, S. parvula sp. nov.). Identification keys to the genera Halosigmoidea, Pseudosigmoidea and Sigmoidea, and Halosigmoidea species are provided.
©2009 by Walter de Gruyter Berlin New York
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Artikel in diesem Heft
- Research articles
- Invasive potential of Kappaphycus alvarezii off the south coast of Rio de Janeiro state, Brazil: a contribution to environmentally secure cultivation in the tropics
- Composition and annual cycle of phytoplankton assemblages in the northeastern Adriatic Sea
- Molecular evidence for recolonization of Ceramium japonicum (Ceramiaceae, Rhodophyta) on the west coast of Korea after the last glacial maximum
- Marine benthic algae of the South Kamchatka state wildlife sanctuary (Kamchatka, Russia)
- Taxonomic revision of Gracilaria “verrucosa” from the Russian Far East based on morphological and molecular data
- Proline metabolism in response to salt stress in common reed [Phragmites australis (Cav.) Trin. ex Steud]
- Phylogenetic position of freshwater and marine Sigmoidea species: introducing a marine hyphomycete Halosigmoidea gen. nov. (Halosphaeriales)
- Short communication
- Macroalgal (Boodlea composita) bloom at Kure and Midway Atolls, Northwestern Hawaiian Islands
- Book review
- Seagrasses: biology, ecology and conservation
- Meetings
- Meetings
