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17 results for “Drymarchon”
FIGURE 11 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 11. Holotype (UF-Herpetology 52751) of Gulf Coast Indigo Snake, Drymarchon kolpobasileus, from Sarasota County, Florida. A) lateral, B) dorsal, and C) ventral views of head region.
FIGURE 9 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 9. Holotype (ANSP 3937) of Eastern Indigo Snake, Drymarchon couperi, presumably from Wayne County, Georgia. A) lateral, B) dorsal, and C) ventral views of head region.
FIGURE 10 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 10. Holotype (UF-Herpetology 52751) of Gulf Coast Indigo Snake, Drymarchon kolpobasileus, from Sarasota County, Florida. A) dorsal and B) ventral views.
FIGURE 8 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 8. Holotype (ANSP 3937) of Eastern Indigo Snake, Drymarchon couperi, presumably from Wayne County, Georgia. A) dorsal and B) ventral views.
FIGURE 7 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 7. Distribution of Indigo Snake (Drymarchon) samples on the subaerially exposed Florida Platform in Florida and Georgia. Atlantic Lineage (blue triangles; with dots = genetic samples, without dots = this study using morphology based on cluster analysis); Gulf Lineage (red circles; with dots = genetic samples, without dots = this study using morphology based on cluster analysis); and stars represent holotype specimens for D. couperi (blue) and D. kolpobasileus (red). Genetic data taken from Krysko et al. (2016).
FIGURE 6 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 6. Principal component analysis of head and scale linear measurements of Atlantic (blue polygon) and Gulf (red polygon) lineages of Drymarchon in the southeastern United States. Bivariate plot of factor scores for the first two principal component axes of log-transformed shape variables. Convex hulls encapsulate all data points for a particular genetic lineage found by Krysko et al. (2016). Stars represent holotype specimens for D. couperi (blue) and D. kolpobasileus (red).
FIGURE 3 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 3. Illustration of the morphological variables collected. These measurements included head length (HL), head height (HH), temporal length (TL), infralabial length (ILL), and infralabial height (ILH).
FIGURE 2 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 2. Bayesian inference phylogeny using combined mtDNA (cytochrome b and ND4 region) and scnDNA (NT3) for Indigo Snakes (Drymarchon) in the southeastern United States. Values above nodes represent posterior probabilities, values below nodes represent the mean divergence time estimation of the most recent common ancestor (MRCA) and time intervals in parentheses representing 95% Highest Posterior Density (HPD). Representative images for Gulf Lineage UF-Herpetology 157097, Miami-Dade County, Florida; and Atlantic Lineage UF-Herpetology 169964, Saint Johns County, Florida. Modified after Krysko et al. (2016).
FIGURE 5 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 5. Differences in infralabial and temporal scale morphology between the A) Eastern Indigo Snake, Drymarchon couperi (Holbrook, 1842), and B) Gulf Coast Indigo Snake, D. kolpobasileus, found in this study. Illustrations originally taken and modified from Cope (1900). Note that D. kolpobasileus has relatively deeper and shorter 7th infralabial scales, shorter temporal scales, and overall shorter and shallower head dimensions (not depicted).
FIGURE 1 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 1. Proposed differences in supralabial morphology between the A) Western Indigo Snake, Drymarchon melanurus erebennus (Cope, 1860), and B) Eastern Indigo Snake, D. couperi (Holbrook, 1842), after Baird & Girard (1853). Illustrations originally taken from Cope (1900) and modified after Conant (1958).
FIGURE 4 in A cryptic new species of Indigo Snake (genus Drymarchon) from the Florida Platform of the United States
FIGURE 4. Principal component analysis of head and scale measurements of Atlantic (blue) and Gulf (red) lineages of Drymarchon in the southeastern United States. Bivariate plot of factor scores for the first two principal component axes of logtransformed shape variables. Convex hulls encapsulate all data points for a particular genetic lineage found by Krysko et al. (2016).
Drymarchon corais (Colubridae) and Caiman crocodilus (Alligatoridae) use different feeding behaviors to consume poisonous toads
<p><span>Drymarchon corais</span><span> and Caiman crocodilus are reported here using different feeding behaviors for consuming poisonous toads of the genus Rhinella (Bufonidae). Drymarchon corais was observed feeding on specimens of Rhinella diptycha without avoiding contact with the parotoid macroglands, suggesting that this snake species is immune to toad toxins. Caiman crocodilus was recorded avoiding contact with the parotoid macroglands of specimens of Rhinella marina by consuming only the front and rear legs, suggesting that this caiman may be sensitive to toad toxins. Further experimental and field studies are needed to better understand the feeding behavior of D. corais and C. crocodilus, and the effects of Rhinella toxins on these predators.</span></p>
Drymarchon corais (Colubridae) and Caiman crocodilus (Alligatoridae) use different feeding behaviors to consume poisonous toads
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FIGURE 2 in Patterns of head shape and scutellation in Drymarchon couperi (Squamata: Colubridae) reveal a single species
FIGURE 2. Bivariate plot of head height on head length. Values from Atlantic lineage indicated by solid circles and solid line; values from Gulf Coast lineage indicated by open circles and dashed line.
FIGURE 1 in Patterns of head shape and scutellation in Drymarchon couperi (Squamata: Colubridae) reveal a single species
FIGURE 1. Head scale patterns in Eastern Indigo Snakes (Drymarchon couperi). A) 2+2 condition of temporals (I = dorsal anterior temporal; II = ventral anterior temporal; III = dorsal posterior temporal; IV = ventral posterior temporal) and position of 4th, 5th, 6th, and 7th infralabials; dashed lines represent linear measurements described in the text; B) 3v+2 condition of temporals (extra ventral temporal shaded); C) 4+2 condition of temporals (extra dorsal and ventral temporal shaded); D) 3d+2 condition of temporals (extra dorsal temporal shaded).
FIGURE 4 in Patterns of head shape and scutellation in Drymarchon couperi (Squamata: Colubridae) reveal a single species
FIGURE 4. Distribution of length-to-width ratio of 6th and 7th infralabials in 11 Atlantic lineage specimens of Drymarchon couperi (dark spots). Open triangles indicate ratios from type specimen of D. couperi (Atlantic lineage); open diamonds indicate ratios from type specimen of D. kolpobasileus (Gulf Coast lineage).
FIGURE 3 in Patterns of head shape and scutellation in Drymarchon couperi (Squamata: Colubridae) reveal a single species
FIGURE 3. Box and whiskers plot of distribution of ratio of dorsal posterior-most temporal scale length to head length in four categories of temporal scales (see Figure 1). Vertical lines indicate range; box indicates interquartile, horizontal line indicates median; open diamond indicates mean.
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