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47 results for “Hemichordata”
FIGURE 5 in A taxonomic revision of the family Harrimaniidae (Hemichordata: Enteropneusta) with descriptions of seven species from the Eastern Pacific
FIGURE 5. Light micrographs of transverse sections of Saxipendium coronatum: A, Proboscis with heart–kidney complex. B, Anterior region of the proboscis neck. C, Posterior region of the proboscis neck showing the neuropore and skeleton plate. D, Anterior region of the collar. E, Posterior region of the collar showing the collar pores. F, Collar canal and pore. G, Posterior region of the collar showing the curved skeletal cornua. H, Anterior region of the trunk. Abbreviations: bp, branchial pore; bv, blood vessel; cc, collar canal; cl, collar lumen; clm, collar longitudinal muscles; cp, collar pore; cv, cardiac vesicle; dm, dorsal mesentery; g, glomerulus; gb, gill bar; go, gonad; gp, gonopore; nc, nerve cord; np, neuropore; pc, proboscis coelom; phd, perihaemal diverticulum; pl, pharynx lumen; plm, proboscis longitudinal muscles; pv, proboscis vesicle; s, stomochord; sc, skeletal cornua; sp, skeletal plate; vm, ventral mesentery. Scale bars: A, C, D, G, H = 1000 µm; B, E = 500 µm; F = 200 µm.
FIGURE 2 in A taxonomic revision of the family Harrimaniidae (Hemichordata: Enteropneusta) with descriptions of seven species from the Eastern Pacific
FIGURE 2. Drawings of live animals and photographs of fixed specimens of the family Harrimaniidae. A, Drawing of the dorsal side of Horstia kincaidi n. gen. et n. sp. B, Drawing of the lateral side of Mesoglossus intermedius n. gen. et n. sp. C, Drawing of the dorsal side of Mesoglossus intermedius. D, Drawing of the dorsal side of Stereobalanus willeyi n. sp. E, Drawing of the lateral side of Stereobalanus willeyi. F, Photograph of the dorsal side of Horstia kincaidi. G, Photograph of the lateral side of Ritteria ambigua n. gen. et n. sp. H, Photograph of the dorsal side of Mesoglossus intermedius. I, Photograph of the dorsal side of Stereobalanus willeyi. J, Photograph of the lateral side of Stereobalanus willey. Abbreviations: bp, branchial pore; c, collar; gr, genital ridge; p, proboscis; t, trunk. Scale bars = 2 mm
FIGURE 3 in A taxonomic revision of the family Harrimaniidae (Hemichordata: Enteropneusta) with descriptions of seven species from the Eastern Pacific
FIGURE 3. Light micrographs of transverse sections of Stereobalanus willeyi n. sp.: A, Proboscis with heart–kidney complex. B, Posterior part of the proboscis showing the skeleton. C, Proboscis neck. D, Anterior region of the collar. E, Anterior pharyngeal region of the trunk. F, Genital region of the trunk. Abbreviations: cl, collar lumen; cv, cardiac vesicle; g, glomerulus; gb, gill bar; go, gonad; nc, nerve cord; np, neuropore; pbr, parabranchial ridge; pc, proboscis coelom; pl, pharynx lumen; plm, proboscis longitudinal muscles; pv, proboscis vesicle; s, stomochord; sb, skeletal body; sc, skeletal cornua; sl, stomochord lumen; vc, ventral caecum; vm, ventral mesentery. Scale bars: A, D, E, F = 1000 µm; B = 500 µm; (C) = 750 µm.
FIGURE 1 in A taxonomic revision of the family Harrimaniidae (Hemichordata: Enteropneusta) with descriptions of seven species from the Eastern Pacific
FIGURE 1. Light micrographs of transverse sections of the proboscis of: A, Saccoglosus pusillus, showing the arrangement of the proboscis longitudinal musculature in concentric rings. B, Protoglossus mackiei n. sp., showing the arrangement of the proboscis longitudinal musculature in radial plates. C, Mesoglossus macginitiei n. gen. et n. sp., showing the diffuse arrangement of the proboscis longitudinal musculature. Abbreviations: plm, proboscis longitudinal muscles. Scale bars = 500 µm.
Transcriptomic evidence for Brachyury expression in the caudal tip region of adult Ptychodera flava (Hemichordata)
<p>Most metazoans have a single-copy of the T-box transcription factor gene,<em> Brachyury</em>. The gene is expressed in cells of the blastopore of late blastulae and the archenteron invagination and stomodeum invagination regions of gastrulae. It appears to be crucial for gastrulation and mesoderm differentiation of embryos. Although this expression pattern is shared by most deuterostomes<a href="#_msocom_1">[AA1]</a> , <em>Brachyury</em> expression was not reported in adult stage. Here we show that <em>Brachyury</em> of an indirect-developer, a hemichordate acorn-worm, <em>Ptychodera flava,</em> is expressed not only in embryonic cells but also in cells of the caudal tip (anus) region of adults. This spatially restricted expression shown by whole-mount <em>in situ</em> hybridization was confirmed by Iso-seq RNA sequencing analyses and single cell RNA-seq (scRNA-seq) analysis. Iso-seq analysis showed that the gene expression occurred only in the caudal region of the adult but not in the anterior regions including stomochord. scRNA-seq analysis showed that a cluster that contained <em>Brachyury</em>-expressing cells composed of mesoderm-related cells, but not associated with epidermis, nervous system, and muscle. Although further studies are required to examine roles of <em>Brachyury</em> at the adult stage, this study suggests a possible evolutionary link of the <em>Brachyury</em>-expressing caudal tip of hemichordates with the anus formation region of chordates.</p>
FIGURE 4 in Four new species and a ribosomal phylogeny of Rhabdopleura (Hemichordata: Graptolithina) from New Zealand, with a review and key to all described extant taxa
FIGURE 4. Original illustrations of described species of Rhabdopleura characterized by indirect inception of ringed erect tubes from creeping tubes via an intervening adnate portion that comprises a blind-ending branch. A, Rhabdopleura normani (from Allman 1869, pl. 8, fig. 1). Note that most of the colony is adherent; only the ringed tubes (rt) are erect, the proximal part of each side branch (ppsb) is adherent and the oblique sutures are not shown. B, schematic interpretative depiction of R. normani (after Andres 1977). C, D, Rhabdopleura grimaldii (from Jullien 1890, p. 181); note that ringed erect tubes (rt) are mostly lacking, with only the adherent proximal parts of side branches (ppsb) present. D is a cropped part of C to show the proximal parts of two side branches, with fusellar sutures and Jullien's putative 'very fine tubes' (vft)—actually the side walls of the tapering pectocaulus, the proximal end of which is transparent, hence the apparent gap between it and the pectocaulus of the creeping tube. E, F, Rhabdopleura striata (from Schepotieff 1909, pl. 7, figs 2, 7); E shows longitudinally striated erect parts of side branches; oblique sutures on prostrate parts omitted in E but shown in F, with characteristic web of fusellar sutures (wfs) in branch angles from main creeping tube. G, Rhabdopleura manubialis (from Jullien & Calvet, 1903, pl. 1, fig. 2) with dormant bodies (db).
FIGURE 9. Rhabdopleura francesca n in Four new species and a ribosomal phylogeny of Rhabdopleura (Hemichordata: Graptolithina) from New Zealand, with a review and key to all described extant taxa
FIGURE 9. Rhabdopleura francesca n. sp.: A, section of creeping tube of holotype with a broken erect tube; note the small erect-tube diameter relative to the width of the creeping tube. Rhabdopleura decipula n. sp.: B, holotype NIWA 162592 (left) and paratype 1 (NIWA 161212) colonies on broken shells; C, reflected-light image of part of a paratype 2 colony (NIWA 161213) seen in transparency on smooth shell, showing a loop of one creeping-tube branch curving back on itself, with a narrow crossconnection (cc) of the pectocaulus; erect tubes and zooids (z) and a dormant body (db) also seen. D, SEM image of same colony at lower magnification, with branch loop in C at top right. E, another part of same colony seen in transparency, showing a zooid inside a creeping tube to the left (distal) of a dark dormant body. Scale bars: A, 500 μm; B, 10 mm; C, 1 mm; D, 2 mm; E, 400 μm.
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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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DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.