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43 results for “snail-eating snake”
Fig. 4 in A new species of snail-eating snakes of the genus Pareas Wagler, 1830 (Reptilia: Serpentes) from eastern Himalayas, India
Fig. 4. Pareas kaduri sp. nov. Paratype, ♂ (NCBS BH655). A–B. Hemipenis, lateral view. Scale bars = 1 mm.
Fig. 6 in A new species of snail-eating snakes of the genus Pareas Wagler, 1830 (Reptilia: Serpentes) from eastern Himalayas, India
Fig. 6. ML phylogeny of Pareas based on partial sequences of the mitochondrial cyt b gene generated through 1000 non-parametric bootstrap pseudoreplicates under the GTR + G model of sequence evolution. Numbers at nodes represent ML bootstrap support and BI posterior probability. For a complete tree see Appendix III.
Fig. 3 in A new species of snail-eating snakes of the genus Pareas Wagler, 1830 (Reptilia: Serpentes) from eastern Himalayas, India
Fig. 3. Pareas kaduri sp. nov. Holotype, ♂ (BNHS 3574). View of head. A. Left lateral view. B. Dorsal view. C. Ventral view. Scale bars = 5 mm.
Niche partitioning among three snail-eating snakes revealed by dentition asymmetry and prey specialisation
<p>1. The level of dentition asymmetry in snail-eating snakes may reflect their prey choice and feeding efficiency on asymmetric land snails. The three species of Pareas snakes (Squamata: Pareidae) in Taiwan, which are partially sympatric distribution on the island, provide a potential case to test the hypothesis of niche partitioning and character displacement with regard to dentition asymmetry and specialisation in feeding behaviour.</p> <p>2. In this study, behavioural experiments confirmed that P. formosensis feeds exclusively on slugs, whereas P. atayal and P. komaii consumed both. However, P. atayal more efficiently preys on land snails than P. komaii, exhibiting a shorter handling time and fewer mandibular retractions.</p> <p>3. Micro-CT and ancestral character reconstruction demonstrated the lowest asymmetry in P. formosensis (the slug specialist), the highest dentition asymmetry in P. atayal (the land snail specialist), and flexibility in P. komaii (the niche switcher): increased dentition asymmetry when sympatrically distributed with the slug eater (character displacement), and decreased asymmetry when living alone (ecological niche release).</p> <p>4. Ecological niche modelling showed that the distribution P. formosensis is associated with the presence of slugs, while that of P. atayal could be explained by the land snails.<br> Combining the results from morphology, phylogeny, behavioural experiments and ecological niche modelling, we showed that competition in the sympatric region might have facilitated character displacement among congeners, while absence of competition in allopatric region has led to ecological niche release.</p>
Fig. 1 in A new species of snail-eating snakes of the genus Pareas Wagler, 1830 (Reptilia: Serpentes) from eastern Himalayas, India
Fig. 1. Pareas kaduri sp. nov. Holotype, ♂ (BNHS 3574) in life. Photograph by Zeeshan A. Mirza.
Fig. 2 in A new species of snail-eating snakes of the genus Pareas Wagler, 1830 (Reptilia: Serpentes) from eastern Himalayas, India
Fig. 2. Pareas kaduri sp. nov. Holotype, ♂ (BNHS 3574). A–B. Lateral views. Scale bars = 25 mm.
Niche partitioning among three snail-eating snakes revealed by dentition asymmetry and prey specialisation
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FIGURE 6 in Geographical variation and taxonomy of the snail-eating snake Dipsas albifrons (Sauvage, 1884), with comments on the systematic status of Dipsas albifrons cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae)
FIGURE 6. Sulcate (A) and asulcate (B) sides of hemipenes of Dipsas albifrons. (A, from municipality of Corupá (IBSP 64929), State of Santa Catarina, Brazil (Ruler equals to 5 mm).
FIGURE 5 in Geographical variation and taxonomy of the snail-eating snake Dipsas albifrons (Sauvage, 1884), with comments on the systematic status of Dipsas albifrons cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae)
FIGURE 5. Dorsal (A) and lateral (B) views of the head of Dipsas albifrons (Sauvage, 1884) (IBSP 17746, lectotype). (Ruler equals to 5 mm).
FIGURE 2. Bivariate plot with 95 in Geographical variation and taxonomy of the snail-eating snake Dipsas albifrons (Sauvage, 1884), with comments on the systematic status of Dipsas albifrons cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae)
FIGURE 2. Bivariate plot with 95% confidence regions for the first 2 axes derived from scores of PCA analysis of female (A) and male (B) populations of Dipsas albifrons. (C, D). Black dots = States of Paraná and Santa Catarina; black squares = Queimada Grande Island; and black triangles 3 = State of Espírito Santo.
FIGURE 3 in Geographical variation and taxonomy of the snail-eating snake Dipsas albifrons (Sauvage, 1884), with comments on the systematic status of Dipsas albifrons cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae)
FIGURE 3. Correlations of meristic characters with corresponding principal components (directional cosines) for females (A) and males (B) of Dipsas albifrons; 1 = number of ventral scales, 2 = number of subcaudal scales, 3 = number of supralabial scales, 4 = number of infralabial scales, 5 = number of blotches on the body, and 6 = number of blotches on the tail.
FIGURE 4 in Geographical variation and taxonomy of the snail-eating snake Dipsas albifrons (Sauvage, 1884), with comments on the systematic status of Dipsas albifrons cavalheiroi Hoge, 1950 (Serpentes: Colubridae: Dipsadinae)
FIGURE 4. Bivariate plots of geographical distances in kilometers versus Mahalanobis D morphological distances computed from meristic characters for females (A) and males (B) of Dipsas albifrons.
FIGURE 1 in Systematics and molecular phylogenetics of Asian snail-eating snakes (Pareatidae)
FIGURE 1. The maximum-likelihood tree inferred from the concatenated mitochondrial and nuclear sequence data. The four major lineages are coded in different colors: light green (Pareas I), red (Pareas II), blue (Aplopeltura) and light brown (Asthenodipsas). Bayesian posterior probability (before slash) and ML bootstrap support (after slash) are denoted above branches.
Supplementary material 1 from: Arteaga A, Batista A (2023) A consolidated phylogeny of snail-eating snakes (Serpentes, Dipsadini), with the description of five new species from Colombia, Ecuador, and Panama. ZooKeys 1143: 1-49. https://doi.org/10.3897/zookeys.1143.93601
Morphological and locality data for specimens of Dipsadini species examined, either directly, indirectly through digital photographs, or both. Codes: SVL = snout-vent length (mm); TL = tail length (mm); M = Male, F = Female.
Supplementary material 2 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Appendix S2
Supplementary material 1 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Appendix S1
Supplementary material 4 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Figure 1
Figure 3 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Figure 3 The comparisons of dorsal head (row 1) and median dorsal (row 2) between Pareas macularius and P. margaritophorus. AP. margaritophorusBP. macularius.
Figure 2 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Figure 2 Bayesian inference(left) and Maximum Likelihood(right) trees of the Pareidae based on mtDNA dataset. Branch support measures are Bayesian posterior probabilities and ML bootstrap support respectively. Branch support indices are not given for most intrageneric nodes to preserve clarity.
Supplementary material 3 from: Wang P, Che J, Liu Q, Li K, Jin JQ, Jiang K, Shi L, Guo P (2020) A revised taxonomy of Asian snail-eating snakes Pareas (Squamata, Pareidae): evidence from morphological comparison and molecular phylogeny. ZooKeys 939: 45-64. https://doi.org/10.3897/zookeys.939.49309
Appendix S3
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