The raphid pennates

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August undefined, 2024

WebbWithin the latter, the raphid pennates, those with a slit called a raphe, r epresent the most recent diversification and are the most species-rich group of extant dia- WebbThe araphidpennatesconstituteamorphologically far more homogeneous group than the multipolar centrics. They have an elongate shape, a midrib, striae perpendicular to it, …

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Webb15 mars 2012 · There are four major structural groups, radial centrics, polar centrics, araphid pennates and raphid pennates. Among the four major structural groups of … Webb18 jan. 2024 · These three classes (Coscinodiscophyceae = radial centric diatoms; Mediophyceae = polar centric diatoms + radial Thalassiosirales; Bacillariophyceae = pennate diatoms) more accurately reflect the evolution and diversity of the diatoms than does the three-class system of centrics, araphid pennates and raphid pennates … barbara ann minerva dceu wiki

Diatom phylogenetics inferred based on direct optimization of …

Webb13 maj 2009 · A third group of diatoms, the araphid pennates, are detected in the fossil record from this period ( Fig. 3 ). By 50 Myr ago, atmospheric O 2 concentrations had stabilized to today's levels,... WebbOdontella sinensis (Kowallik et al. 1995), and raphid pennates Phaeodactylum tricornutum (Oudot-Le Secq et al. 2009) and Fistulifera sp. JPCC DAO0580 (Tanaka et al. 2011). Additionally, the plastid genomes of two dinoflagellates Kryptoperidinium foliaceum and Durinskia baltica, also known as dinotoms because they Webb24 jan. 2024 · araphid pennates (Synedra acus. 26) and raphid . pennates 26 (Phaeodactylum tricornutum. 7,27, Fistulifera solaris. 28, Fragilariopsis cylindrus. 29, Pseudo-nitzschia . 27 . multistriata. 30) have become available in recent years, w. hich allows the analysis of the evolutionary 28 history within diatoms. barbara ann moen

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A time-calibrated multi-gene phylogeny of the diatom genus …

Webband pennates (araphid or raphid) (Simonsen 1972, 1979, Round et al. 1990). Recent molecular analyses, however, have suggested extensive reorganization of the diatom classiﬁcation system into different clades (Medlin and Kaczmarska 2004, Fig. 1). The ﬁrst clade, based on nuclear small subunit (SSU) rRNA, includes WebbResponses to local and global stressors in the large southern perialpine lakes: Present status and challenges for research and management barbara ann minerva / cheetahWebb25 feb. 2014 · Multipolar centrics can be a variety of shapes, whereas pennate diatoms are elongated with bilateral symmetry. Pennate diatoms can be further broken down into araphid and raphid pennates, the latter of which can move through sediments or over surfaces by passing secretions through a slit (raphe) present in one or both of the valves. barbara ann monson

"Webb16 aug. 2024 · They are sister to all other pennates, both araphid and raphid taxa. Thus, their phylogenetic position carries the potential for providing insights into the earliest pennates. We documented sexual reproduction, mating system and sex cell development in the first members of the "basal" araphid clade ever investigated. " - The raphid pennates

The raphid pennates

Contrasting biogeography and diversity patterns between ... - Nature

Webb10 juni 2024 · Diatoms are an ecologically fundamental and highly diverse group of algae, dominating marine primary production in both open-water and coastal communities. The diatoms include both centric species, which may have radial or polar symmetry, and the pennates, which include raphid and araphid species an … WebbSome apparently benthic raphid pennates can be found in the plankton as well, but these seem to use the marine snow as a substratum. Others live in the brine channels of seasonal sea ice. A possible reason why so few pennate diatoms are truly planktonic may have to do with their mode of sexual reproduction (see Figure 3C).

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WebbThe raphid pennates appear to form a monophyletic group, and while the radial centrics form a clade in some treatments, the bi- and multipolar centrics and the araphid pennates are generally considered to be paraphyletic. WebbClade I araphid pennates are apparently the first pennate diatoms to appear in the fossil record although, because the clade is characterized by molecular genetic data, any …

Webb13 dec. 2004 · The lineage that shares the most recent common ancestor with the raphid pennates is composed of taxa representing Fragilariales, Striatellales, Rhabdonematales and Thalassionematales. Representatives of Eunotiales are the sister-group of the pennates with an “advanced” raphe structure. Webb18 aug. 2024 · There are two main groups of diatoms, the centrics and the pennates, which differ markedly regarding key cytological, biological, and ecological aspects, that include cell wall symmetry, chloroplast number and morphology, sexual reproduction, and motility (Pickett-Heaps 2003).

Webb7 okt. 2008 · Pennate diatoms are monophyletic. Their principal cell wall elements, called valves, are shaped like a ship’s hull. Within the pennates, the araphids are paraphyletic; … Webb8 juni 2024 · The diatom Phaeodactylum tricornutum has been used as a model for cell biologists and ecologists for over a century. We have incorporated several new raphid pennates into a three gene phylogenetic dataset (SSU, rbcL, psbC), and recover Gomphonemopsis sp. as sister to P. tricornutum with 100% BS supp …

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Webb8 juni 2024 · We have incorporated several new raphid pennates into a three gene phylogenetic dataset (SSU, rbcL ), and recover sp. as sister to . with 100% BS support. This is the first time a close relative has been identified for P with robust statistical support. We test and reject a succession of hypotheses for other relatives. barbara ann mikulskiWebbBoth centric and pennate diatoms are further divided into two sub-groups: the centrics into radial and polar types, based on descriptors of frustule symmetry, and the pennates into raphid and araphid types, based on the presence or absence, respectively, of a slit known as raphe at the centre of the frustule that facilitates motility on surfaces … barbara ann moore obituaryWebbChitin synthases are widespread among eukaryotes and known to have a complex evolutionary history in some of the groups. We have reconstructed the chitin synthase phylogeny using the most taxonomically comprehensive dataset currently available and have shown the presence of independently formed paralogous groups in oomycetes, … barbara ann moore