Diatom phylogeny
WebJul 17, 2024 · Diatom evolution through the lens of genomics. Major events during the evolution of diatoms from secondary endosymbionts are shown, together with approximate dates. TE, transposable element. The estimated time of separation between pennate and centric diatoms at around 70 million years (70 Ma) is based on Chacón-Baca et al. . WebDiatoms are single-celled organisms which secrete intricate skeletons. These may be elongate, with a bilateral plane of symmetry, or they may be round and radially symmetrical. Many diatoms are slightly asymmetrical, though they generally fall into one of these two categories. The skeleton of a diatom, or frustule, is made of very pure silica ...
Diatom phylogeny
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WebDespite the uncertainty generated by reshuffling diatom phylogeny, over time, barcodes should help to resolve taxonomy in diatoms and other microalgae (Oliveira et al., 2024). A hidden resource for unravelling diatom mysteries may sit in the massive number of 16S rRNA sequences archived in public repositories. WebMay 14, 2011 · Phylogeny of the diatom order Thalassiosirales based on a Bayesian analysis of four concatenated genes.Pie graphs at internal nodes show the relative maximum likelihood support for the inferred ancestral habitat type, and asterisks show that the more strongly supported ancestral habitat type is significantly better than the alternative.
WebFeb 1, 2003 · Traditionally, the taxonomic identification of diatoms mostly relied on the morphological features of the frustule [1] followed by other characters, such as ultrastructure, sexual reproduction... WebApr 13, 2024 · Diatoms are one of the main species of interest due to their possible impact on the maintenance of ecosystems, as well as their photosynthetic capacity and biotechnological applications. Reliable, easy, rapid identification of diatoms remains a highly desirable goal to avoid the difficulty for experts in the visual analysis of frustules; a …
WebHowever, under certain analytical conditions, an alternative view of diatom evolution, a grades of clades, has been recovered that suggests a gradual evolution from centric to pennate symmetry. These two schemes of diatom evolution are evaluated in terms of whether or not the criteria advocated by Medlin & Kaczmarska that should be met to ... WebApr 26, 2024 · Kingdom Fungi, one of the most diverse and ancient branches of the tree of life, includes an estimated 2–5 million species that play vital roles in terrestrial and aquatic ecosystems (Figure 1). 1, 2, 3 Fungi exhibit a wide variety of feeding lifestyles, morphologies, developmental patterns, and ecologies and are thought to have coevolved …
WebMar 1, 2024 · Polyploidy is a significant driving force in the evolution of diatom species (Parks et al., 2024). Due to its significant haplotype divergence, Fragilariopsis cylindrus CCMP1102 might also be an appropriate candidate for testing how the potential variation in the expression levels of alleles contributes to fitness effects and, therefore, the ...
WebJan 20, 2024 · The genus Entomoneis Ehrenberg includes diatoms with structurally complex frustules having a bilobate keel elevated above the valve surface and numerous girdle bands. We describe here a new member of the genus, Entomoneis tenera sp. nov., a minute species found in the plankton of the south-eastern Adriatic Sea. The description … rhyme recoveryWebTo further explore the existence and diversity of possible light-utilizing microorganisms, we then constructed and analyzed a 23S rRNA plastid gene cloning library. The results showed that the majority of this cloning library was occupied by oxygenic photoautotrophic organisms, such as diatoms Thalassiosira spp. and cyanobacterium Synechococcus sp. rhyme reasonFor many years the diatoms—treated either as a class (Bacillariophyceae) or a phylum (Bacillariophyta)—were divided into just 2 orders, corresponding to the centric and the pennate diatoms (Centrales and Pennales; alternative names Biddulphiales and Bacillariales, as used e.g. in Lee, 1989). This classification was extensively overhauled by Round, Crawford and Mann in 1990 who treat… rhyme recognition