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1,925 results for “Platyhelminthes”
FIGURE 3. Duplominona hystricina n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
FIGURE 3. Duplominona hystricina n. sp. (A) Habitus of a living animal; see Fig. 2 A for interpretation of anatomical features. (B) Reconstruction of the cirrus. (C) Spine morphology. (D, E) Micrographs of cirri. (F) Reconstruction of the genital areas from sagittal sections. (G) Stylet of the accessory organ. (Scale bars: B, C = 5 μm; D, E, G = 10 μm).
FIGURE 2. Duplominona basidilatata n in New species of Duplominona Karling, 1966 (Platyhelminthes, Proseriata) from the Pacific coast of Panama
FIGURE 2. Duplominona basidilatata n. sp. (A) Habitus of a living animal. (B) Reconstruction of the cirrus. (C) Micrograph of the cirrus. (D) Spine morphology. (E) Stylet of the accessory organ. (F) Reconstruction of the genital areas from sagittal sections. (Scale bars = 10 μm).
FIGURE 2 in New records of the giant planarian Polycladus gayi Blanchard, 1845 (Platyhelminthes: Geoplanidae) with notes on its conservation biology
FIGURE 2. Distributional map of Polycladus gayi Blanchard, 1845, developed with ArcGIS v. 10.4.1. Land use is classified by different colors and the new records are marked as green circles. Geopolitic regions are numbered from North to South.
FIGURE 1. Polycladus gayi Blanchard, 1845 in New records of the giant planarian Polycladus gayi Blanchard, 1845 (Platyhelminthes: Geoplanidae) with notes on its conservation biology
FIGURE 1. Polycladus gayi Blanchard, 1845: (A) living individual in native forest, Parque Tagua Tagua, Región de Los Lagos. Photo: Parque Tagua Tagua; (B) living individual with size reference, Villa García, Región de La Araucanía. Photo: Augusto Castro.
FIGURE 4 in On a new Temnocephala (Platyhelminthes) from Southern Patagonia (Chile, Argentina), with a redescription of T. chilensis and some systematic and biogeographical insights*
FIGURE 4. Temnocephala chilensis. (A) Non-everted penial stylet in lateral view. Bar = 50 µm. (B) Everted introvert. Bar = 25 µm. (C) Egg. Bar = 250 µm.
FIGURE 3 in On a new Temnocephala (Platyhelminthes) from Southern Patagonia (Chile, Argentina), with a redescription of T. chilensis and some systematic and biogeographical insights*
FIGURE 3. Temnocephala chilensis. (A) Whole specimen in ventral view. Bar = 500 µm. Arrowheads, paranephrocytes. (B) Main reproductive organs in ventral view, drawn from a dissection. Bar = 200 µm. Abbreviations: at, atrium; cv, contractile vesicle; ev, excretory vesicle; go, gonopore; hg, Haswell's glands; in, intestine; ov, ovary; ph, pharynx; ps, penial stylet; rv, resorbiens vesicle; sg, sucker glands; sp, sphincter; sr, seminal receptacle; su, sucker; sv, seminal vesicle; te, testes; tg, tentacular glands; vg, vagina; vi, vitellaria.
FIGURE 2. Temnocephala monticellii n in On a new Temnocephala (Platyhelminthes) from Southern Patagonia (Chile, Argentina), with a redescription of T. chilensis and some systematic and biogeographical insights*
FIGURE 2. Temnocephala monticellii n. sp. (A) Non-everted penial stylet in lateral view. Bar = 50 µm. (B) Fully everted introvert. Bar = 25 µm. (C) Egg. Bar = 250 µm.
FIGURE 1. Temnocephala monticellii n in On a new Temnocephala (Platyhelminthes) from Southern Patagonia (Chile, Argentina), with a redescription of T. chilensis and some systematic and biogeographical insights*
FIGURE 1. Temnocephala monticellii n. sp. (A) Whole specimen in ventral view. Bar = 500 µm. Arrowheads, right-side paranephrocytes. (B) Main reproductive organs in ventral view, drawn from a dissection. Bar = 100 µm. Abbreviations: at, atrium; cv, contractile vesicle; ev, excretory vesicle; go, gonopore; hg, Haswell's glands; in, intestine; ov, ovary; ph, pharynx; ps, penial stylet; rv, resorbiens vesicle; sg, sucker glands; sp, sphincter; sr, seminal receptacle; su, sucker; sv, seminal vesicle; te, testes; tg, tentacular glands; vg, vagina; vi, vitellaria.
FIGURE 1 in Cataloguing Prof. Eudóxia M. Froehlich's wet collection of land planarians (Platyhelminthes, Geoplanidae): a bounty of type specimens of 78 species
FIGURE 1. Some of the 80 jars, containing specimens, after replacing the medium with new 80% ethanol.
FIGURE 3 in Cataloguing Prof. Eudóxia M. Froehlich's wet collection of land planarians (Platyhelminthes, Geoplanidae): a bounty of type specimens of 78 species
FIGURE 3. Examples of preservation condition of type specimens: A: very good (Geoplana garua); B: good (Geoplana chalona); C: bad (Geoplana irua); D: very bad (Geoplana assu). At different scales.
Data from: Outstanding intraindividual genetic diversity in fissiparous planarians (Dugesia, Platyhelminthes) with facultative sex
Background: Predicted genetic consequences of asexuality include high intraindividual genetic diversity (i.e., the Meselson effect) and accumulation of deleterious mutations (i.e., Muller's Ratchet), among others. These consequences have been largely studied in parthenogenetic organisms, but studies on fissiparous species are scarce. Differing from parthenogens, fissiparous organisms inherit part of the soma of the progenitor, including somatic mutations. Thus, in the long term, fissiparous reproduction may also result in genetic mosaicism, besides the presence of the Meselson effect and Muller's Ratchet. Dugesiidae planarians show outstanding regeneration capabilities, allowing them to naturally reproduce by fission, either strictly or combined with sex (facultative). Therefore, they are an ideal model to analyze the genetic footprint of fissiparous reproduction, both when it is alternated with sex and when it is the only mode of reproduction. Results: In the present study, we generate and analyze intraindividual cloned data of a nuclear and a mitochondrial gene of sexual, fissiparous and facultative wild populations of the species Dugesia subtentaculata. We find that most individuals, independently of their reproductive strategy, are mosaics. However, the intraindividual haplotype and nucleotide diversity of fissiparous and facultative individuals is significantly higher than in sexual individuals, with no signs of Muller's Ratchet. Finally, we also find that this high intraindividual genetic diversity of fissiparous and facultative individuals is composed by different combinations of ancestral and derived haplotypes of the species. Conclusions: The intraindividual analyses of genetic diversity point out that fissiparous reproduction leaves a very special genetic footprint in individuals, characterized by mosaicism combined with the Meselson effect (named in the present study as the mosaic Meselson effect). Interestingly, the different intraindividual combinations of ancestral and derivate genetic diversity indicate that haplotypes generated during periods of fissiparous reproduction can be also transmitted to the progeny through sexual events, resulting in offspring showing a wide range of genetic diversity and putatively allowing purifying selection to act at both intraindividual and individual level. Further investigations, using Dugesia planarians as model organisms, would be of great value to delve into this new model of genetic evolution by the combination of fission and sex.
FIGURE 9. AC in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 9. AC. Haplodidymos rubroculatus gen. nov. sp. nov. Reproductive organs. A. ventral view posterior to pharynx. Scale bar = 30 µm. B. Ventral view of fixed holotype. Scale bar = 45 µm. C. Sagital reconstruction of posterior end. Scale bar = 100 µm. BC, bursa copulatrix; CG, caudal glands; CO, copulatory organ; GA, genital atrium; OV, ovary; SR, receptaculum seminis; ST, stylet; TE, testes; UT, uterus; VI, vitellaria; VS, vesicula seminalis.
FIGURE 8 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 8. Haplodidymos rubroculatus gen. nov. sp. nov. Anterior end showing large eyes. Scale bar = 60 µm.
FIGURE 7 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 7. Haplodidymos rubroculatus gen. nov. sp. nov. Slightly squeezed live specimen. Scale bar = 150 µm. AR, adenal rhabdites; BC, bursa copulatrix; EY, eye; OV, ovary; PB, pigment bands; PH, pharynx; RS, receptaculum seminis; TE, testis; UT, uterus; VI, vitellaria.
FIGURE 6. AB in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 6. AB. Austrodalyellia ariena gen. nov. sp. nov. Camera lucida drawings of stylet with different tine layers color coded: dorsal (white), medial (lt. grey), and ventral (dk. grey). The thin membrane that exists between dorsal and medial tine bars is also shaded. A, Squashed stylet from fixed holotype. B, Everted stylet from fixed paratype. Scale bars = 15 µm.
FIGURE 5 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 5. Austrodalyellia ariena gen. nov. sp. nov. Whole mounts of sclerotic stylet. A. DIC micrograph of stylet in genital canal. B, Everted stylet in fixed paratype. C, Stylet from squashed live specimen. D, DIC micrograph of stylet in fixed holotype. Scale bars = 45 µm.
FIGURE 4. AC in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 4. AC. Austrodalyellia ariena gen. nov. sp. nov. A, Frontal section through dorsal body region. Scale bar = 100 µm. B, Frontal section through posterior body region, approximately medial. Scale bar = 80 µm. C, Frontal section through ventral body region. Scale bar = 30 µm. CO, copulatory organ; EG, egg; GL, glands around gonopore; GP, gonopore; GT, gut lumen; PH, pharynx; UT, uterus; VI, vitellaria.
FIGURE 2 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 2. Austrodalyellia ariena gen. nov. sp. nov. Frontal section through anterior end. BR, brain; EY, eye; PH, pharynx. Scale bar = 50 µm.
FIGURE 3 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 3. Austrodalyellia ariena gen. nov. sp. nov. Schematic of the reproductive system. BC, bursa copulatrix; EG, egg; GA, genital atrium; GC, genital canal; GL, glands around gonopore; GP, gonopore; OV, ovary; RS, receptaculum seminis; TE, testes; UT, uterus; VG, vesicula granulorum; VS, vesicula seminalis; VI, vitellaria. Scale bar = 120 µm.
FIGURE 1 in Two new freshwater rhabdocoels, Austrodalyellia gen. nov. and Haplodidymos gen. nov. (Platyhelminthes), from Queensland, Australia
FIGURE 1. Austrodalyellia ariena gen. nov. sp. nov. Slightly squeezed live specimen. BC, bursa copulatrix; BR, brain; CO, copulatory organ; EG, egg; EY, eye; GL, glands around gonopore; OV, ovary; PH, pharynx; RS, receptaculum seminis; TE, testes; UT, uterus; VI, vitellaria. Scale bar = 250 µm.
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Allen Brain Atlas
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Annotated Behaviour and Observability Dataset (ABODe)
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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
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