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FIGURE 15 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 15. Dorsal (A) and ventral views (B) of head and lateral view of body (C) of Atractus multicinctus (ICN 7075). Scale = 5 mm.

FIGURE 9 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 9. Sulcate and asulcate sides of the hemipenis of (A) Atractus iridescens (ICN 10902), (B) detailed view of lateral expansion of the hemipenis of Atractus iridesnces, (C) sulcate and asulcate sides of the hemipenis of Atractus typhon sp.nov. (ICN 10901). Scale = 5mm.

FIGURE 16 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 16. Dorsal (A) and ventral (B) views of Atractus paucidens (MZUSP 7703). SVL 263 mm, CL 49 mm.

FIGURE 7 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 7. Dorsal (A) and ventral (B) views of Atractus iridescens (ICN 10902). SVL 353 mm, CL 50 mm.

FIGURE 5 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 5. Dorsal (A) and ventral (B) views of the holotype of Atractus echidna sp. nov. (UV-C 7718). SVL 201 mm, CL 47 mm.

FIGURE 11 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 11. Lateral view of head of the holotype of Atractus medusa sp. nov. (IAvH 2981). Scale = 5mm.

FIGURE 4 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 4. Sulcate and asulcate sides of the hemipenis of (A) Atractus clarki (ICN 10826) and (B) Atractus multicinctus (ICN 7075). Scale = 5mm.

FIGURE 1 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 1. Dorsal (A) and ventral (B) views of Atractus boulengerii (UV-C 6591). SVL 310 mm, CL 52 mm.

FIGURE 8 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 8. Dorsal (A) and lateral (B) views of the head of Atractus iridescens (ICN 10902). Scale = 5 mm.

FIGURE 18 in Pacific lowland snakes of the genus Atractus (Serpentes: Dipsadidae), with description of three new species

FIGURE 18. Dorsal (A) and lateral (B) views of head and lateral view of body (C) of the holotype of Atractus typhon sp. nov. (ICN 10901). Scale = 10 mm.

FIGURE 7 in A new giant Atractus (Serpentes: Dipsadidae) from Ecuador, with notes on some other large Amazonian congeners

FIGURE 7. Dorsal (top) and lateral (bottom) view illustrations of the head of the holotype (FHGO 517) of A. touzeti.

FIGURE 3 in A new giant Atractus (Serpentes: Dipsadidae) from Ecuador, with notes on some other large Amazonian congeners

FIGURE 3. Photographs of individuals in life of A. major (top left: Amazonas, Venezuela; top right: Bolívar, Venezuela; bottom left: Ecuador) and A. snethlageae (bottom right: Ecuador).

FIGURE 2 in A new giant Atractus (Serpentes: Dipsadidae) from Ecuador, with notes on some other large Amazonian congeners

FIGURE 2. Results of the multivariate statistical analyses (ellipses always represent 95% confidence intervals). Top left: Scatterplot of the first two PC of an analysis grouping specimens into color patterns types I (solid dots), II (Xs), and III (open dots). Top right: Scatterplot of the first two PC of an analysis including specimens of A. snethlageae (open dots) and A. touzeti (solid dots). Bottom left: scatterplot of TL vs. PC2 in specimens of A. snethlageae (open dots) and A. touzeti (solid dots); fitted straight line and squared correlation coefficient are for the first species. Bottom right: Scatterplot of the first two PC of an analysis including specimens of A. badius (solid dots), A. flammigerus (Xs), and A. snethlageae (open dots).

FIGURE 1 in A new giant Atractus (Serpentes: Dipsadidae) from Ecuador, with notes on some other large Amazonian congeners

FIGURE 1. Specimens of large banded/blotched Atractus from the Amazon Basin grouped into three color pattern types (I: top row, II: middle, III: bottom). Extremes of variation within each color pattern type are shown.

FIGURE 8 in A new giant Atractus (Serpentes: Dipsadidae) from Ecuador, with notes on some other large Amazonian congeners

FIGURE 8. Map of Ecuador indicating type locality (solid circle) of A. touzeti. The two localities in which the species has been collected are nearby and cannot be separated on the map.

FIGURE 12 in Morphological variation, polymorphism, and Taxonomy of the Atractus torquatus complex (Serpentes: Dipsadidae)

FIGURE 12. Dorsal (A) and ventral (B) views of body of the lectotype of Rabdosoma torquatum (RMNH 114).

FIGURE 11 in Morphological variation, polymorphism, and Taxonomy of the Atractus torquatus complex (Serpentes: Dipsadidae)

FIGURE 11. Original plate of the holotype of Rabdosoma varium (RMNH 114), modified from Jan and Sordelli (1865).

FIGURE 10. Bivariate plots with 95 in Morphological variation, polymorphism, and Taxonomy of the Atractus torquatus complex (Serpentes: Dipsadidae)

FIGURE 10. Bivariate plots with 95% confidence regions for the first two axes derived from scores of PCA analyses for male (A–B) and female (C–D) of Atractus torquatus complex.

FIGURE 13 in Morphological variation, polymorphism, and Taxonomy of the Atractus torquatus complex (Serpentes: Dipsadidae)

FIGURE 13. Geographical distribution of the Atractus torquatus. Black triangle corresponds to doubtful and circles to literature records. Literature records were taken from Dixon & Soini (1977, 1986), Hoogmoed (1980) and Abuys (1984).

FIGURE 8 in Morphological variation, polymorphism, and Taxonomy of the Atractus torquatus complex (Serpentes: Dipsadidae)

FIGURE 8. Pattern of the geographic variation for polymorphic qualitative character along of the Atractus torquatus complex. The number of supralabials = 1, number of infralabials = 2 and number of maxillary teeth = 3. The colour represents the frequency for each state of characters: blue correspond to six; green correspond to seven and red correspond to eight. The frequencies of the character states are from our own sample plus from the Dixon & Soini (1986). The total sample comprises 81 individuals and the traits were counted in both sides for each specimen.