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48 results for “Theodoxus”
Figure 23 from: Sands AF, Glöer P, Gürlek ME, Albrecht C, Neubauer TA (2020) A revision of the extant species of Theodoxus (Gastropoda, Neritidae) in Asia, with the description of three new species. Zoosystematics and Evolution 96(1): 25-66. https://doi.org/10.3897/zse.96.48312
Figure 23 Type locality of Theodoxus wesselinghi Sands & Glöer sp. nov. A, B. Sakarya River, Çayköy, Bilecik, Turkey, 40.0439°N, 30.452°E. Further paratype localities: C, D. Unnamed roadside spring in Fele, Isparta province, Turkey, 38.00358°N, 31.47217°E; E, F. Eflatun Pınarı, near Sadıkhacı, Konya, Turkey, 37.8256°N, 31.6748°E; G, H. Balıkdamı Wetland spring, Eskişehir, Turkey, 39.15277°N, 31.61562°E.
Figure 25 from: Sands AF, Glöer P, Gürlek ME, Albrecht C, Neubauer TA (2020) A revision of the extant species of Theodoxus (Gastropoda, Neritidae) in Asia, with the description of three new species. Zoosystematics and Evolution 96(1): 25-66. https://doi.org/10.3897/zse.96.48312
Figure 25 Radula of Theodoxus wesselinghi Sands & Glöer sp. nov. paratypes. A. Portion of the radula showing full sets of teeth (UGSB 20688); B. Magnified view of the central teeth (UGSB 20688); C. Magnified view of the lateral and marginal teeth (UGSB 20686); D. Magnified view of the first and second rows of marginal teeth (UGSB 20688); E. Magnified view of the first row of marginal teeth (UGSB 20686); F. Magnified view of the faces of inner marginal teeth belonging to the first row (UGSB 20685). Scale bars: 100 μm (A–E), 20 μm (F).
Figure 3 from: Sands AF, Glöer P, Gürlek ME, Albrecht C, Neubauer TA (2020) A revision of the extant species of Theodoxus (Gastropoda, Neritidae) in Asia, with the description of three new species. Zoosystematics and Evolution 96(1): 25-66. https://doi.org/10.3897/zse.96.48312
Figure 3 Occurrence map for Theodoxus spp. in Asia. All points conform to specimens used in the phylogenetic analyses (Suppl. material 1: Table S1), except for T. gloeri for which no molecular data are available and only the type and paratype localities are indicated. Species are partitioned across four identical maps (A–D) to limit overlap of points as far as possible. Barring T. gloeri, closer related species are grouped together (Fig. 2).
FIGURE 4 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)
FIGURE 4. Canonical Variate Analysis (CVA) showing operculum shape differences among populations of three Theodoxus species in the space of the first two CV axes covering 79.09% of the total sample variability (CV1 56.86% and CV2 22.23%). Abbrs. as in Table 1. The pattern of operculum shape differences among populations of three Theodoxus species corresponding to the first two CV axes is shown on a thin plate spline deformation grids. The average positions of the landmarks are linked with vectors pointing in the direction of shape changes along the axes.
FIGURE 3 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)
FIGURE 3. Canonical Variate Analysis (CVA) showing operculum shape differences among males and females of three Theodoxus species in the space of the first two CV axes covering 92.83% of the total sample variability (CV1 73.58% and CV2 19.25%). The pattern of operculum shape differences among males and females of three Theodoxus species corresponding to the first two CV axes is shown on a thin plate spline deformation grids. The average positions of the landmarks are linked with vectors pointing in the direction of shape changes along the axes.
FIGURE 2 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)
FIGURE 2. Opercula of T. danubialis (A), T. fluviatilis (B) and T. transversalis (C) with the landmarks/semilandmarks (grey dots numbered from 1 to 13) used in our shape analysis. Legend: 1, 5, 10 and 11 are landmarks (as length extremes of the operculum plate and the rib/aphophysal ridge i.e. the most distal points from each other on the examined structures); 2-4 and 6- 9 are semilandmarks on the operculum plate (a fan created using MakeFan); 12 and 13 are semilandmarks on the rib/ aphophysal ridge; 14 and 15 are landmarks on the scale. Repository numbers of specimens: T. danubialis (2013_td-prosek_24), T. fluviatilis (tf-danube-bezdan_01) and T. transversalis (2013_tt-prosek_02).
FIGURE 5 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)
FIGURE 5. Differences in centroid size (CS) of Theodoxus opercula: A. Between sex per species. B. Among populations. and C. Species. The median with the first and the third quartiles is shown (in boxes), together with the range of variation and outliers.
FIGURE 1 in Operculum shape variation in Theodoxus Montfort, 1810 (Gastropoda: Neritidae)
FIGURE 1: Sampling localities of the analyzed populations belonging to three Theodoxus species.
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