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166 results for “Atractus”
Fig. 7 in Morphological Extremes-Two New Snakes of the Genus Atractus from Northwestern South America (Colubridae: Dipsadinae)
Fig. 7. Atractus gigas, new species. Head of holotype (FHGO 194). A. Dorsal view, X1.7. Arrow points to diamond-shaped frontonasal scale between internasal and prefrontal sutures. B. Ventral view, X1.2. Scale divisions 5 mm.
Fig. 5 in Morphological Extremes-Two New Snakes of the Genus Atractus from Northwestern South America (Colubridae: Dipsadinae)
Fig. 5. Atractus gigas, new species. Views of the adult female holotype (FHGO 194), shown much smaller than life (X0.48).
Fig. 3 in Morphological Extremes-Two New Snakes of the Genus Atractus from Northwestern South America (Colubridae: Dipsadinae)
Fig. 3. Everted hemipenis of Atractus attenuatus, new species, in sulcate and asulcate views. Left organ of holotype (AMNH R-19998), X8.9. (Laboratory preparation from hemipenis preserved in retracted condition; fully everted but not necessarily completely expanded.)
Data from: Integrating niche and occupancy models to infer the distribution of an endemic fossorial snake (Atractus lasallei)
<p>Understanding species distribution and habitat preferences is crucial for effective conservation strategies. However, the lack of information about population responses to environmental change at different scales hinders effective conservation measures. In this study, we estimate the potential and realized distribution of <em>Atractus lasallei</em>, a semi-fossorial snake endemic to the northwestern region of Colombia. We modelled the potential distribution of <em>A. lasallei</em> based on ecological niche theory (using maxent), and habitat use was characterized while accounting for imperfect detection using a single-season occupancy model. Our results suggest that <em>A. lasallei</em> selects areas characterized by slopes below 10°, with high average annual precipitation (>2500mm/year) and herbaceous and shrubby vegetation. Its potential distribution encompasses the northern Central Cordillera and two smaller centers along the Western Cordillera, but its habitat is heavily fragmented within this potential distribution. When the two models are combined, the species' realized distribution sums up to 935 km<sup>2</sup>, highlighting its vulnerability. We recommend approaches that focus on variability at different spatio-temporal scales to better comprehend the variables that affect species' ranges and identify threats to vulnerable species. Prompt actions are needed to protect herbaceous and shrub vegetation in this region, highly demanded for agriculture and cattle grazing.</p>
Fig. 16 in Rare Snakes-Five New Species from Eastern Panama: Reviews of Northern Atractus and Southern Geophis (Colubridae: Dipsadinae)
Fig. 16. Colombian holotype of Geophis nigroalbus Boulenger. BMNH 1946.1.6.50 (formerly
Fig. 5 in Rare Snakes-Five New Species from Eastern Panama: Reviews of Northern Atractus and Southern Geophis (Colubridae: Dipsadinae)
Fig. 5. Hemipenis of Atractus clarki (MCZ 133013). Uneverted left organ opened midventrally, ×10.
Fig. 2 in Morphological Extremes-Two New Snakes of the Genus Atractus from Northwestern South America (Colubridae: Dipsadinae)
Fig. 2. Atractus attenuatus, new species. Head of holotype (AMNH R-19998), X5.
Data from: Integrating niche and occupancy models to infer the distribution of an endemic fossorial snake (Atractus lasallei)
Open the record for dataset details and reuse information.
FIGURE 4 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 4. Atractus tamessari sp. nov.: (A) dorsal view of the preserved male holotype (IRSNB 2640), (B) dorsal view of a preserved subadult female paratopotype (IRSNB 2641), (C) ventral view of the preserved male holotype (IRSNB 2640), and (D) ventral view of a preserved subadult female paratopotype (IRSNB 2641).
FIGURE 5 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 5. Map of Guyana showing the distribution of Atractus tamessari sp. nov. (dot = type locality).
FIGURE 6 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 6. Area map of the eastern part of Kaieteur National Park showing the collection site of Atractus tamessari sp. nov. (square). Map after "Kaieteur Sheet 43 SW" published by the Survey Department of Guyana, 1972.
FIGURE 3 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 3. Almost fully everted right hemipenis of Atractus tamessari sp. nov. (holotype, IRSNB 2640): (left) sulcate, and (right) asulcate sides; scale = 5 mm.
FIGURE 2 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 2. Atractus tamessari sp. nov.: (A) the male holotype (IRSNB 2640) in life, (B) ventral view of the male holotype (IRSNB 2640) in life, and (C) a subadult female paratopotype (IRSNB 2641) in life.
FIGURE 1 in A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America
FIGURE 1. Atractus tamessari sp. nov. (holotype, IRSNB 2640): (A) dorsal, (B) lateral, and (C) ventral views of the head.
FIGURE 3 in A new species of Atractus Wagler, 1828 (Serpentes: Colubridae) from Eastern Amazonia, Brazil
FIGURE 3. Hemipenis of Atractus caxiuana (holotype—MPEG 19964). Sulcate (a) and asulcate (b) sides. Scale bar 5 mm.
FIGURE 1 in A new species of Atractus Wagler, 1828 (Serpentes: Colubridae) from Eastern Amazonia, Brazil
FIGURE 1. Head of Atractus caxiuana (holotype—MPEG 19964). Dorsal (a), ventral (b), and lateral (c) views. Scale bar 5 mm.
FIGURE 17 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species
FIGURE 17. Dorsal (A) and ventral (B) views of the holotype of Atractus typhon sp. nov. (ICN 10901). SVL 293 mm, CL 79 mm.
FIGURE 14 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species
FIGURE 14. Dorsal (A) and ventral (B) views of Atractus multicinctus (ICN 7075). SVL 228 mm, CL 35 mm.
FIGURE 13 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species
FIGURE 13. General view of original Sordelli's plate of the Atractus multicinctus. Modified from Jan & Sordelli (1865).
FIGURE 10 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species
FIGURE 10. Dorsal (A) and ventral (B) views of the holotype of Atractus medusa sp. nov. (IAvH 2981). SVL 325 mm, CL 60 mm.
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