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81 results for “red algae”
Data from: Three-dimensional preservation of cellular and subcellular structures reveal 1.6 billion-year-old probable crown-group red algae
The ~1.6 Ga Tirohan Dolomite of the Lower Vindhyan in central India contains phosphatized stromatolitic microbialites. We report from there uniquely well-preserved fossils interpreted as crown-group rhodophytes (red algae). The filamentous form Rafatazmia chitrakootensis n.gen, n.sp. has uniserial rows of large cells and grows through diffusely distributed septation. Each cell has a centrally suspended, conspicuous rhomboidal disk interpreted as a pyrenoid. The septa between the cells have central structures that may represent pit connections and pit plugs. Another filamentous form, Denaricion mendax n.gen., n.sp., has coin-like cells reminiscent of those in large sulfur-oxidizing bacteria, but much more recalcitrant than the liquid-vacuole-filled cells of the latter. Its wider affinities are uncertain. Ramathallus lobatus n.gen., n.sp. is a lobate sessile alga with pseudoparenchymatous thallus and apparent tetraspore formation, suggesting florideophycean affinity. Rafatazmia and Ramathallus are interpreted as crown-group multicellular rhodophytes, antedating the oldest previously accepted red alga in the fossil record by about 400 million years.
FIGURE 17 in Hypnea platyclada, a new species of red alga (Rhodophyta, Cystocloniaceae) from Brazil
FIGURE 17: Map of the coast of Bahia, Brazil, showing the distribution of Hypnea platyclada sp. nov.
FIGURES 11−16 in Hypnea platyclada, a new species of red alga (Rhodophyta, Cystocloniaceae) from Brazil
FIGURES 11−16: Reproductive features of Hypnea platyclada sp. nov. Fig. 11: Cross section of a branch containing tetrasporangia unilaterally arranged. Fig. 12: Details of tetrasporangia produced in the cortical region of the branch. Fig. 13: Cross section of a cystocarp. Fig. 14: Details of carposporangia at apex of columnar gonimoblast. Fig. 15: Cross section of a branch containing spermatangial sori arranged on one side. Fig 16: Details of spermatangia in chains. Scale bars: Fig. 11 = 10 µm; Fig. 12 = 50 µm; Fig. 13 = 100 µm; Fig. 14 = 50 µm; Fig. 15 = 20 µm; Fig. 16 = 10 µm.
FIGS 1–7 in The marine red algae of Rodrigues (Mauritius, Indian Ocean)
FIGS 1–7. Rhodophytes. (1) Gracilaria corticata (HEC 14627). (2) Renouxia antillana (HEC 14804). (3) Platoma cyclocolpa (HEC 14805). (4) Titanophora pikeana (HEC 14875). (5, 6) Cryptonemia crenulata (HEC 14876): (5) general morphology; (6) serrate margin. (7) Cryptonemia crenulata (HEC 15134b): cross-section showing cortex and medulla with densely stained ganglionic cells. Scale bars: 1 cm (1, 3, 4); 2 cm (2, 5); 5 mm (6); 50 Mm (7).
FIGURE 2 in Transfer of the marine red alga Erythrocystis saccata (Rhodomelaceae, Rhodophyta) to the tribe Streblocladieae inferred from organellar genome analysis
FIGURE 2. RAxML phylogram of the complete plastid genome of Erythrocystis saccata (GenBank Accession MW810349) and representative Rhodomelaceae. Numbers along the branches are rapid bootstrap support values based on 1,000 replicates. The legend below represents the scale for nucleotide substitutions.
FIGURE 1 in Transfer of the marine red alga Erythrocystis saccata (Rhodomelaceae, Rhodophyta) to the tribe Streblocladieae inferred from organellar genome analysis
FIGURE 1. Erythrocystis saccata growing epiphytically on Laurencia pacifica from Stillwater Cove, Pebble Beach, California, USA (UC 2085026). The arrow indicates the specimen analyzed in this study. White bar = 2 cm.
Fig. 4 in Condensation derivatives of 4-isopropylbenzaldehyde with acetophenone from the red alga Laurencia tristicha
Fig. 4. Absolute configurations determination of compounds 2a/2b, 3a/3b, and 4a/4b by comparison of the experimental ECD curves (measured at about 1 mg/mL in methanol) with calculated curves.
Data from: Phylogeographic structure and deep lineage diversification of the red alga Chondrus ocellatus Holmes in the Northwest Pacific
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Data from: Three-dimensional preservation of cellular and subcellular structures reveal 1.6 billion-year-old probable crown-group red algae
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Hidden introductions of freshwater red algae via the aquarium trade exposed by DNA barcodes
<p>The global aquarium trade can introduce alien freshwater invaders, potentially impacting local aquatic ecosystems and their biodiversity. The role of the aquarium trade in spreading freshwater red macroalgae that hitchhike on ornamental aquatic plants and animals is unassessed. We investigated this human-mediated phenomenon via a broad biodiversity survey and genetic analysis of freshwater red algae in the field and aquarium shops in East Asia.</p> <p><b>Results</b><br> We found 26 molecular operational taxonomic units (mOTUs) in Taiwan, some of which are cryptic. Phylogeographical analysis revealed three potential introduced mOTUs in Taiwan, which exhibit no local genetic variation in Taiwan and are distributed across continents. Also, we posit that some presumably endangered freshwater red algae may be preserved in aquaria, an unintentional <i>ex situ</i> conservation site for these organisms that are vulnerable to water pollution from anthropogenic disturbances.</p> <p><b>Main Conclusions</b><br> Collectively, these data suggest that freshwater red algae have been hitchhiking and dispersed via the aquarium trade, an important and overlooked mechanism of introduction of these organisms across the globe.</p>
Figure 9 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 9 Stigmatopora harastii in situ A–C male D female, The Gutter, Bass Point, Shellharbour, NSW, Australia, 18 meters depth, 17 Feb 2017 (photographs: Craig Taylor).
Figure 8 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 8 Stigmatopora harastii in situ, male-female pair A lateral view B anterior view, Minmi Trench, Botany Bay, NSW, Australia, 18 meters depth, 17 February 2019 (photographs: Duncan Heuer).
Figure 7 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 7 Stigmatopora harastii in situ, male, The Leap, Kurnell, Botany Bay, NSW, Australia, 12 meters depth, 03 October 2018 (photograph: Andrew Trevor-Jones).
Figure 6 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 6 Aerial view of the scuba dive site The Steps, Kurnell, Botany Bay, NSW, Australia A shore and entrance B inshore boulders (photographs: Michael McFadyen).
Figure 4 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 4 Stigmatopora harastii in situ, ASM I.47267 paratypes, female, The Steps, Kurnell, Botany Bay, NSW, Australia at 11–12 meters depth, 06 June 2017 (photographs: David Harasti).
Figure 3 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 3 Stigmatopora harastii in situ, ASM I. 49510-001, holotype, male A (right individual) B (left individual); The Steps, Kurnell, Botany Bay, NSW, Australia, 13.5 meters depth, 18 June 2020. The male holotype was photographed with a paired female individual, which was not collected. Note the large cluster of distinct red spots extending posteriad on venter of anterior trunk rings in the male (photographs: Andrew Trevor-Jones).
Figure 2 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 2 Stigmatopora harastii, preserved directly after collection, paratypes, female A ASM I.47267-001, 136.3 mm SLB ASM I.47267-002, 138.2 mm SL; Australia: NSW, Botany Bay, Kurnell (photograph: Kerryn Parkinson).
Figure 11 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 11 Fucoid algae and seagrass associating members of Stigmatoporain situAS. nigra, male, Nelson Bay, NSW (photograph: David Harasti) BS. nigra, female, Port Hughes, Gulf St Vincent, South Australia (photograph: David Muirhead) CS. argus, Port Hughes, Gulf St Vincent, South Australia (photograph: Graham Short) DS. narinosa, Port Hughes, Gulf St Vincent, South Australia (photograph: Graham Short) ES. macropterygia, Winstones Cove, North Island, New Zealand (photograph: Nick Shears).
Figure 1 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 1 Stigmatopora harastii, preserved directly after collection, ASM I. 49510-001, holotype male, 145.5 mm SLA dorsal view B lateral view C ventral view; Australia: NSW, Botany Bay, Kurnell (photograph: Kerryn Parkinson).
Figure 10 from: Short G, Trevor-Jones A (2020) Stigmatopora harastii, a new species of pipefish in facultative associations with finger sponges and red algae from New South Wales, Australia (Teleostei, Syngnathidae). ZooKeys 994: 105-123. https://doi.org/10.3897/zookeys.994.57160
Figure 10 Comparison of the dorsal median ridge present on the head and first trunk ring in: AS. harastii and BS. nigra, ASM I.42611-009. Note the dorsal median ridge (DMR) extending into the first trunk ring in S. nigra versus ending on the posterior nuchal plate in S. harastii. Abbreviations: ANP, anterior nuchal plate; DMR, dorsal median ridge; Fr, frontal; PNP, posterior nuchal plate; SOC, supraoccipital; first TnR, first trunk ring (illustration by Kent Sorgon).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
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