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14 results for “Gyraulus”
Even short‐distance dispersal over a barrier can affect genetic differentiation in Gyraulus, an island freshwater snail
<p>Supplementary dataset for a published paper, "Saito T., Sasaki T., Tsunamoto Y., Uchida S., Satake K., Suyama Y., <em>et al.</em> (2022). Even short‐distance dispersal over a barrier can affect genetic differentiation in <em>Gyraulus</em> , an island freshwater snail. <em>Freshwater Biology</em> <strong>67</strong>, 1971–1983. <a href="https://doi.org/10.1111/fwb.13990">https://doi.org/10.1111/fwb.13990</a>"</p>
Figure 1. A in Gyraulus laevis and G. parvus (Mollusca: Gastropoda), two distinct species
Figure 1. A – shell of G. laevis; B – shell of G. parvus; C – vas deferens of G. parvus with attenuated middle part (arrow).
Figure 4 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)
Figure 4. Longitudinal (LS) and transverse (TS) transmission electron micrograph sections of spermatozoa of Gyraulus (Gyraulus) albus. (a) LS, sperm head at the final stage of maturation. (b, c) LS, internal structure of the acrosomal complex. (d) TS, acrosomal pedestal. (e) TS, basal portion of the nucleus with trapezoid coarse fibres. (f) TS, neck region with trapezoid coarse fibres and a single glycogen mass surrounded by a thin band of mitochondrial derivative. (g) TS, anterior midpiece with triangular coarse fibres and four glycogen helices enclosed within a mitochondrial derivative. (h) LS, posterior portion of the nucleus, neck region and anterior portion of the midpiece. (i) LS, middle portion of the midpiece showing four glycogen helices, mitochondrial derivative and axial complex. (j) TS, middle portion of the midpiece showing three glycogen helices, mitochondrial derivatives and axial complex. (k) TS, middle portion of the midpiece with two glycogen helices, mitochondrial derivative and axoneme. (l) TS, posterior midpiece with a single glycogen helix. (m) TS, posterior
Figure 3 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)
Figure 3. Longitudinal (LS) and transverse (TS) transmission electron micrograph sections of spermatozoa of Gyraulus (Armiger) crista. (a, b) LS, head of a spermatozoon at the final stage of maturation. (c) LS, internal structure of the acrosomal complex. (d) TS, middle portion of the nucleus. (e) TS, basal portion of the nucleus with trapezoid coarse fibres and a single glycogen mass surrounded by a thin band of mitochondrial derivative. (f) TS, neck region with triangular coarse fibres and four glycogen helices enclosed within the mitochondrial derivative. (g) LS, middle portion of the midpiece with three glycogen helices, mitochondrial derivative and axoneme. (h) TS, middle portion of the midpiece with two glycogen helices, mitochondrial derivative and axoneme. (i) TS, posterior portion of the midpiece with a single glycogen helix. (j) TS, portion of the midpiece without glycogen helices. (k, l) LS, annulus region showing a ring at the tip of the mitochondrial derivative (black arrows) and a cylinder at the anterior end of the glycogen piece (white arrows). (m) TS, glycogen region with the axoneme. (n) TS, axoneme in the tail region with a complete 9 + 2
Figure 2 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)
Figure 2. Scanning electron micrographs of sperm heads. (a) Gyraulus (Armiger) crista. (b) Gyraulus (Gyraulus) albus. Scale bars: a, b = 1 µm.
Figure 1 in Sperm ultrastructure in two species of Gyraulus (Gastropoda: Pulmonata: Planorbidae)
Figure 1. General view of spermatozoa. Light microscopy. (a) Gyraulus (Armiger) crista. (b) Gyraulus (Gyraulus) albus. Scale bars: a, b = 50 µm.
FIGURE 1 in Gyraulus elenae sp. n. — a new Planorbid snail from Eastern Turkey (Mollusca: Gastropoda: Planorbidae)
FIGURE 1. Gyraulus elenae sp.n. The holotype. Shell and copulative apparatus. Abbreviations: pht—penis sheath; prp —praeputium; vd—vas deferens.
Figure 4 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 4 Copulatory organs (A–D), bursa copulatrix (E) and egg mass (F). A–B, E–F Gyraulus takhteevi sp. n.: A morph 1 B morph 2 C–D G. acronicus from Krestovka River: young (shell Fig. 1F), male stage of mature (shell Fig. 1G).
Figure 2 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 2 Radular teeth of Gyraulus takhteevi sp. n. A Central and lateral teeth (arrow shows a central tooth) B Marginal teeth. Scale bar 10 mμ.
Figure 3 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 3 Drawing pictures of the reproductive organs of Gyraulus takhteevi sp. n. Abbreviations: ag albumen gland bc bursa copulatrix hd hermaphrodite duct ot ovotestis pht phallotheca pr prostate prp preputium sv seminal vesicles vd vas deferens u uterus. Scale bar 1 mm.
Figure 6 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 6 Phylogram derived from Bayesian analysis of CO1 mtDNA gene sequences. Values at nodes represent posterior probabilities. The scale bar represents the branch length as a measure of substitution per site.
Figure 5 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 5 Stylets of Gyraulus takhteevi sp. n. (A) and G. acronicus from Krestovka River (B). Scale bar 200 mμ.
Figure 1 from: Sitnikova T, Peretolchina T (2018) Description of a new species Gyraulus (Pulmonata: Planorbidae) from the land thermal spring Khakusy of Lake Baikal. ZooKeys 762: 1-12. https://doi.org/10.3897/zookeys.762.23661
Figure 1 Shells of type specimens of Gyraulus takhteevi sp. n. and G. acronicus Férussac, 1807). A Holotype G. takhteevi sp. n. B–E Paratypes G. takhteevi sp .n. A–C morph 1 with narrow spire D, E morph 2 with wide spire F–G G. acronicus from Krestovka River: F young individual F mature individual after 5 months of a cultivation. Abbreviations: a – aperture view; b – right side with umbilicus, c – left side with spire. Scale bar 1 mm.
FIGURE 2. A in Gyraulus elenae sp. n. — a new Planorbid snail from Eastern Turkey (Mollusca: Gastropoda: Planorbidae)
FIGURE 2. A map showing localities of G. elenae in Eastern Turkey.
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