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597 results for “Planarian”
Island-specific evolution of a sex-primed autosome in the planarian Schmidtea mediterranea
<p>The sexual strain of the planarian <em>Schmidtea mediterranea </em>is a hermaphrodite indigenous to Tunisia and several Mediterranean islands. Here, we isolated individual chromosomes and used sequencing, Hi-C and linkage mapping to assemble a chromosome-scale genome reference. The linkage map revealed an extremely low rate of recombination on chromosome 1. We confirmed suppression of recombination on chromosome 1 by genotyping of individual sperm and oocytes. We showed that previously identified genomic regions that maintain heterozygosity even after prolonged inbreeding comprise essentially all of chromosome 1. Genome sequencing of individuals isolated in the wild indicated that this phenomenon has evolved specifically in populations from Sardinia and Corsica. We found that most known master regulators of the reproductive system are located on chromosome 1. We used RNA interference to knock down a gene with haplotype-biased expression and observed that this led to the formation of a more pronounced female mating organ. Based on these observations, we propose that chromosome 1 is a sex-primed autosome primed for evolution into a sex chromosome.</p>
Figure 4 in Predation on invasive land gastropods by a Neotropical land planarian
Figure 4. Obama ladislavii capturing Deroceras laeve: (A) planarian encountering the slug; (B) planarian attaching its anterior end to the slug; (C, D) planarian moving towards the slug's head to prevent escape; (E–H) slug surrounded by the planarian and pressed against the substrate.
Figure 1 in Predation on invasive land gastropods by a Neotropical land planarian
Figure 1. Experimental design for determining prey tracking behaviour. Solid line indicates outline of the slime trail. Dashed line indicates a possible path taken by the planarian, and X the planarian's initial position.
Figure 1 in Risk screening and management of alien terrestrial planarians in The Netherlands
Figure 1. Photographs of the alien terrestrial planarian species found indoors and outdoors in The Netherlands: Anisorhynchodemus sp., found in greenhouses in Rotterdam, Amsterdam and Arnhem (A, Photo by Roy Kleukers); Bipalium kewense found in greenhouses Amsterdam, Utrecht and Leiden (B, Photo by Pierre Gros); Parakontikia ventrolineata found in a garden in Amsterdam Noord (C, Photo by Roy Kleukers); Caenoplana coerulea found in a greenhouse in Nijmegen (D, Photo by Roy Kleukers); Caenoplana variegata found in gardens in Castricum, Bleiswijk, Hillegersberg, Zwijndrecht, Zaandam and Heemstede (E, Photo by Roy Kleukers); Caenoplana cf. micholitzi found in a greenhouse in Arnhem (F, Photo by Roy Kleukers); Dolichoplana sp. found in greenhouses in Amsterdam and Arnhem, (G, Photo by Roy Kleukers); Marionfyfea adventor found in gardens in Goes, Schiedam and Beek-Ubbergen (H, Photo by Jochem Kuhnen) and Obama cf. nungara found in a garden center in Gilzen (I, Photo by Pierre Gros).
Figure 3 in Risk screening and management of alien terrestrial planarians in The Netherlands
Figure 3. Distribution of alien terrestrial planarian species in The Netherlands (A sp = Anisorynchodemus sp; BK = Bipalium kewense; CC = Caenoplana coerulea; CM = Caenoplana cf. micholitzi; CV = Caenoplana variegata; D sp = Dolichoplana sp. MA = Marionfyfea adventor; ON = Obama cf. nungara; PV = Parakontikia ventrolineata). For details see Supplementary material Table S24.
Figure 2 in Risk screening and management of alien terrestrial planarians in The Netherlands
Figure 2. Cumulative number of introduced species based on the years of first records of alien terrestrial planarians in the United Kingdom, France, and The Netherlands.
FIGURE 6 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 6 Percentage of feeding response of aboral, oral portions of pharynx and whole pharynx upon feeding (nonparametric Mann-Whitney U test for whole pharynges and oral portions of pharynges; ns, not significant).
FIGURE 5 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 5 Inducement effects of serial dilutions of pork liver extracts on feeding response of isolated pharynges (Kruskal-Wallis test, **P <0.01; *P <0.05; ns, not significant).
FIGURE 4 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 4 Percentage of intact worms and isolated pharynges showing feeding response to pieces of pork liver and liver extracts.
FIGURE 3 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 3 Recovery of feeding in three species after head amputation. Data represent percentage of food uptake from one to nine days post- amputation. A: Dugesia sp.; B: Girardia sp.; C: Paucumara falcata (nonparametric Mann-Whitney U test, **P <0.01; *P <0.05; ns, not significant).
FIGURE 2 Three species and their isolated pharynges. A in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 2 Three species and their isolated pharynges. A: Dugesia sp.; B: Girardia sp.; C: Paucumara falcata; D–F: isolated pharynges of Dugesia sp., Girardia sp. and Paucumara falcata, respectively (intestinal, aboral side at the top and oral end at the bottom; scale bars: 500 µm).
FIGURE 1 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 1 Schematic diagram of specimen preparation. A–B: amputation of Dugesia sp., Girardia sp. (A) and Paucumara falcata (B) (dashed line indicates level of transection); C: isolated pharynx; D: transection of isolated pharynx (upper part originally connected to the intestine and thus forming the aboral end, while the opposite portion concerns the oral end). Downloaded from Brill.com 06/21/2024 07:45:14PM via Open Access. This is an open access article distributed under the terms of the CC BY 4.0 license. https://creativecommons.org/licenses/by/4.0/
FIGURE 7 in High degree of independence in the feeding apparatus of planarian FLatworms
FIGURE 7 Feeding response of isolated complete pharynx, oral portion, and aboral portion of pharynges of (A) Dugesia sp., (B) Girardia sp., (C) Paucumara falcata. Panels no. 1 show intact pharynx, with liver tissue being transported through peristaltic movements and being expelled at the aboral end (top); panels no. 2 show oral portion of the pharynx, with liver tissue being expelled at the aboral end (top); panels no. 3 show unresponsive aboral portion of pharynx being contracted to a sphere. Abbreviations: L, liver tissue; P, pharynx; AP, aboral part of pharynx; OP, oral part of pharynx. In all figures: aboral part at the top and oral portion at the bottom; scale bars: 200 µm. Downloaded from Brill.com 06/21/2024 07:45:14PM via Open Access. This is an open access article distributed under the terms of the CC BY 4.0 license. https://creativecommons.org/licenses/by/4.0/
Linked collectors and determiners for: ' Endless forms most beautiful': taxonomic revision of the planarian Geoplana vaginuloides (Darwin, 1844) and discovery of numerous congeners (Platyhelminthes: Tricladida).
Natural history specimen data linked to collectors and determiners held within, "' Endless forms most beautiful': taxonomic revision of the planarian Geoplana vaginuloides (Darwin, 1844) and discovery of numerous congeners (Platyhelminthes: Tricladida)". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/9dd11965-9958-4665-aef8-d4b9d8d458f0">https://bionomia.net/dataset/9dd11965-9958-4665-aef8-d4b9d8d458f0</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/9dd11965-9958-4665-aef8-d4b9d8d458f0">https://gbif.org/dataset/9dd11965-9958-4665-aef8-d4b9d8d458f0</a>. Formatted as a Frictionless Data package.
Figure 7 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 7. Dugesia hepta: light micrograph sections through the copulatory apparatus. (A) Frontal section showing the ejaculatory duct opening laterally on the right with respect to the apex of the penis papilla. Haematoxylin eosin. (B) Transverse section of the penis papilla protruding in the atrium. Note the dorsal position of the ejaculatory duct and the spermatophore in the lumen. Heidenhain's iron haematoxylin. (C) Transverse section of the ejaculatory duct surrounded by numerous glands. Alcian blue. (D) Transverse section of the atrium with spermatophores in the lumen. Note shell glands opening in its centre-lateral area. Haematoxylin eosin. (E) Detail of the atrium showing luminal epithelium. Transverse section. (F) Transverse section of numerous cement glands. (E, F) Heidenhain's iron haematoxylin.
Figure 6 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 6. Dugesia hepta: light micrograph sections through the copulatory apparatus. (A) transverse section of the penial fold and the penis bulb. Note both vasa deferentia opening in the seminal vesicle. (B) Detail of the penial fold of glandular type. Transverse section. (C) Detail of the penis bulb showing the bulb glands. Transverse section. (A–C) Heidenhain's iron haematoxylin.
Figure 4. Dugesia hepta. DIZAB Pla 3.6 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 4. Dugesia hepta. DIZAB Pla 3.6. Frontal reconstruction of the copulatory apparatus (anterior is to the top).
Figure 5 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 5. Dugesia hepta. Light micrograph sections through the copulatory apparatus. (A) Transverse section of the bursa copulatrix. Note the false seminal vesicles. Heidenhain's iron haematoxylin. (B) Transverse section of the bursal canal. Pasini. (C) Sagittal section showing the penis bulb containing the seminal vesicle, the penis papilla with the ejaculatory duct, the penial fold localized between the penis bulb and the penis papilla. Note a spermatophore in the atrium. Haematoxylin eosin.
Figure 3. Dugesia hepta. Neotype DIZAB Pla 3.1 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 3. Dugesia hepta. Neotype DIZAB Pla 3.1. Sagittal reconstruction of the copulatory apparatus (anterior is to the right).
Figure 1 in Endemic freshwater planarians of Sardinia: Redescription of Dugesia hepta (Platyhelminthes, Tricladida) with a comparison of the Mediterranean species of the genus
Figure 1. Dugesia hepta. Geographic range in four hydrographic basins in NW Sardinia: (A) Rio Mannu di Portotorres ; ( B ) River Silis ; (C) River Coghinas ; (D ) River Temo. Type locality in the Rio Sorgenti San Martino is
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
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