| 1. |
- Anderson, Heidi, et al.
(författare)
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(087–090) Proposal to treat the use of a hyphen in the name of a fossil-genus as an orthographical error
- 2015
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Ingår i: Taxon. - : International Association for Plant Taxonomy. - 0040-0262 .- 1996-8175.
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Tidskriftsartikel (refereegranskat)abstract
- We propose modifications to the Code such that use of a hyphen in the name of a fossil-genus is treated as an error to be corrected by deletion of the hyphen. This will circumvent the need to conserve the numerous de-hyphenated names against unused hyphenated forms. We propose changes to Art. 60 of the Code to allow this correction, and the addition of a phrase in Art. 20 to add clarity to the naming of fossil-genera.
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| 2. |
- Janouškovec, Jan, et al.
(författare)
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Major transitions in dinoflagellate evolution unveiled by phylotranscriptomics
- 2017
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Ingår i: Proceedings of the National Academy of Sciences of the United States of America. - : Proceedings of the National Academy of Sciences. - 0027-8424 .- 1091-6490. ; 114:2, s. E171-E180
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Tidskriftsartikel (refereegranskat)abstract
- Dinoflagellates are key species in marine environments, but they remain poorly understood in part because of their large, complex genomes, unique molecular biology, and unresolved in-group relationships. We created a taxonomically representative dataset of dinoflagellate transcriptomes and used this to infer a strongly supported phylogeny to map major morphological and molecular transitions in dinoflagellate evolution. Our results show an early-branching position of Noctiluca, monophyly of thecate (plate-bearing) dinoflagellates, and paraphyly of athecate ones. This represents unambiguous phylogenetic evidence for a single origin of the group's cellulosic theca, which we show coincided with a radiation of cellulases implicated in cell division. By integrating dinoflagellate molecular, fossil, and biogeochemical evidence, we propose a revised model for the evolution of thecal tabulations and suggest that the late acquisition of dinosterol in the group is inconsistent with dinoflagellates being the source of this biomarker in pre-Mesozoic strata. Three distantly related, fundamentally nonphotosynthetic dinoflagellates, Noctiluca, Oxyrrhis, and Dinophysis, contain cryptic plastidial metabolisms and lack alternative cytosolic pathways, suggesting that all free-living dinoflagellates are metabolically dependent on plastids. This finding led us to propose general mechanisms of dependency on plastid organelles in eukaryotes that have lost photosynthesis; it also suggests that the evolutionary origin of bioluminescence in nonphotosynthetic dinoflagellates may be linked to plastidic tetrapyrrole biosynthesis. Finally, we use our phylogenetic framework to show that dinoflagellate nuclei have recruited DNA-binding proteins in three distinct evolutionary waves, which included two independent acquisitions of bacterial histone-like proteins.
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| 3. |
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| 4. |
- Streng, Michael, et al.
(författare)
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Clarification of the systematic position of two calcareous dinoflagellate taxa belonging to the genus Calciodinellum (Dinophyceae, Peridiniales)
- 2006
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Ingår i: Micropaleontology. - : Micropaleontological Foundation MicroPress Europe. - 0026-2803 .- 1937-2795. ; 52:2, s. 189-192
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Tidskriftsartikel (refereegranskat)abstract
- In an attempt to tidy up some previously published nomenclaturalinconsistencies in their index of fossil dinoflagellates, Fensome and Williams (2004)inadvertently proposed transfers to two taxa that are not consistentwith the current understanding of calcareous dinoflagellates.They proposed the transfers of Sphaerodinella? tuberosa formaelongata Hildebrand-Habel, Willems and Versteegh 1999 to Pernambugiaas Pernambugia tuberosa forma elongata, and Sphaerodinella?tuberosa forma variospinosa Hildebrand-Habel, Willems and Versteegh 1999to Pernambugia as Pernambugia tuberosa forma variospinosa. Inorder to clarify the systematics of these taxa and bring thetaxonomy into line with current concepts, we herein proposethe new combinations Calciodinellum elongatum and Calciodinellumlevantinum forma variospinosum.
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