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Fig. 5 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 5. Percentage frequency distribution of snout-vent length (SVL) of Cerberus schneiderii for each month between Jan.–Oct.2006.

Fig. 9 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 9. Map showing the spatial distribution of Cerberus schneiderii in four brackish ponds ('A3-4', 'A6', 'C2-3' and 'C4-5') at Sungei Buloh Wetland Reserve. Each position was based on the GPS coordinates recorded for each snake captured (n = 2258).

Fig. 3 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 3. Percentage frequency distribution of the number of times that tagged individuals of Cerberus schneiderii were recaptured.

Fig. 2 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 2. Physical conditions (rainfall, air temperature) in relation to relative abundance of Cerberus schneiderii at Sungei Buloh Wetland Reserve between Jan.–Dec.2006: a, total rainfall and mean dry bulb temperature at the Changi Meteorological Station, Singapore; b, relative abundance of snakes represented by the relative number of individuals captured (i.e., # captures (# hours × # observers) –1) to standardise for sampling effort, which differed between months.

Fig. 1 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 1. Map of Sungei Buloh Wetland Reserve showing the locations of the four brackish ponds (A3-4, A6, C2-3 and C4-5) where Cerberus schneiderii individuals were collected.

Fig. 7 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 7. Cerberus schneiderii.. Scatterplots and fitted regression lines of initial snout-vent length (SVL0) against 'SVL after one month' (SVL1) for males (O, solid line) and females (+, dashed line).

Fig. 8 in A Mark-Recapture Study Of A Dog-Faced Water Snake Cerberus Schneiderii (Colubridae: Homalopsidae) Population In Sungei Buloh Wetland Reserve, Singapore

Fig. 8. Cerberus schneiderii. Percentage frequency distribution of microhabitat types utilised by: a, all snakes (n = 2262); b, males (n = 1206); and c, females (n = 1056).

FIG. 8 in A New Genus and New Tribe for Enicognathus melanauchen Jan, 1863, a Neglected South American Snake (Colubridae: Xenodontinae), with Taxonomic Notes on Some Dipsadinae

FIG. 8. Examples of field-everted hemipenes showing diminution (A) or loss (B–C) of distal forks after expansion of capitulum. Pliable tissue separating the sulcus branches before eversion is stretched flat in B and C. (Scale line = 1 mm.) A. Leptodeira annulata cussiliris (AMNH R-107291, right organ); fork slightly widened (cf., fig. 7B), with very short branch terminations concealed in calyces. B. Leptodeira annulata annulata (AMNH R-133340, right organ); a pronounced fork on field-everted organ expanded into this shape after softening in KOH and injection with petroleum jelly (shape is triangular, the heart-shaped appearance imparted by overhanging calyces at top). C. Leptodeira maculata (AMNH R-82150, right organ), showing extreme flattening and loss of terminal fork.

FIG. 2. Enicognathus melanauchen Jan 1863 in A New Genus and New Tribe for Enicognathus melanauchen Jan, 1863, a Neglected South American Snake (Colubridae: Xenodontinae), with Taxonomic Notes on Some Dipsadinae

FIG. 2. Enicognathus melanauchen Jan 1863. Lateral view of anterior body of holotype between ventral plates 17 and 27, ×7.9. Feeble keels are present on some dorsal scales in all rows, but are not discernible on many scales in rows 1–2.

FIG. 5 in A New Genus and New Tribe for Enicognathus melanauchen Jan, 1863, a Neglected South American Snake (Colubridae: Xenodontinae), with Taxonomic Notes on Some Dipsadinae

FIG. 5. Hemipenis of Amnesteophis melanauchen (Jan 1863). Manually everted left organ of holotype of Enicognathus melanauchen, in sulcate (left), apical (top), and asulcate (right) views. (Basal half of organ is split and spread flat; the inflated distal half is fully everted but probably not maximally expanded.) The basally spinulate hemipenis is mostly spinose (spines emphasized by stippling); the spines are replaced on the small lobes by larger, soft flat- tened papillae; the unforked sulcus spermaticus extends centripetally to apex of the left lobe (sinistral sulcus) without entering a nude area in the lobular crotch; calyces are lacking (scale line = 1 mm).

FIG. 6 in A New Genus and New Tribe for Enicognathus melanauchen Jan, 1863, a Neglected South American Snake (Colubridae: Xenodontinae), with Taxonomic Notes on Some Dipsadinae

FIG. 6. Portion of plate 1, livraison 16, in the Iconographie générale des ophidiens (Jan and Sordelli, 1866 [1860–1881]), shown 0.77× original folio size. 1. Syntype of Enicognathus occipitalis Jan 1863, now = Taeniophallus occipitalis. 2. Holotype of Enicognathus melanauchen Jan 1863, type species of Amnesteophis as proposed herein (see also figs. 1–3 and text for comments on faded color pattern).

FIG. 4 in A New Genus and New Tribe for Enicognathus melanauchen Jan, 1863, a Neglected South American Snake (Colubridae: Xenodontinae), with Taxonomic Notes on Some Dipsadinae

FIG. 4. Maxillary dentition of Amnesteophis melanauchen (Jan 1863). Right maxilla of holotype of Enicognathus melanauchen in lateral and ventral views (scale line = 1 mm).

Fig. 9 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 9. Dipsas oreas (Cope). A typically banded specimen from northern Peru (ANSP 31778). The snake is in a defensive posture (see under Defensive Behaviors in the Dipsadini).

Fig. 17 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 17. Defensive behavior of Sibon argus (AMNH 115927) from 600 m on the continental divide north of El Cope´, Cocle´, Panama. Top: The head is widened when mildly disturbed. Bottom: When further harassed, the snake coiled its body into a symmetrically raised spring, keeping its head hidden in the center.

Fig. 21 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 21. The final stage of defensive behavior in Dipsas nicholsi—a raised coil narrowest at the top, with the head exposed. Over a period of several days, this snake consistently coiled in the same direction (counterclockwise following the coils from above). See figure 1 for another view of the same specimen.

Fig. 5 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 5. Dipsas nicholsi (Dunn) from Madden Forest, central Panama. Left: KU 110311 in dorsal and ventral view. Right: KU 110312, above; KU 110313, below.

Fig. 1 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 1. Dipsas nicholsi (Dunn), a snaileater endemic to central Panama. Top: A specimen (not collected) photographed in 1974 in the Madden Forest Preserve, by Harry W. Greene. Bottom: Another specimen from Madden Forest, this one in a final stage of defense posturing (see figs. 20–21), photographed in 1966 by C.W. Myers.

Fig. 3 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 3. Dipsas variegata (Duméril, Bibron, and Duméril). Representative specimens in dorsal and ventral view. Left: D. v. variegata from Rancho Grande, Venezuela (FMNH 204479, 468 mm SVL). Right: D. v. trinitatis from near Asa Wright Nature Center, Trinidad (FMNH 217217, 419 mm SVL).

Fig. 13 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 13. Dipsas andiana (Boulenger) in dorsal and ventral view. Left: Specimen from Bolívar Province, Ecuador (KU 132503). Right: Specimen from Pichincha province, Ecuador (MCZ 166543).

Fig. 2 in Systematics of Snakes Referred to Dipsas variegata in Panama and Western South America, with Revalidation of Two Species and Notes on Defensive Behaviors in the Dipsadini (Colubridae)

Fig. 2. Variation in dorsal head patterns of Dipsas variegata (Duméril, Bibron, and Duméril). From top to bottom: AMNH 111075 (Bolívar, Venezuela), AMNH 137584 (Trinidad), AMNH 21275 (Guyana), AMNH 114769 (Bolívar, Venezuela). The cephalic color pattern of Dipsas variegata, which varies from indistinct to blotched, lacks the distinctive Πshaped marking that characterizes D. nicholsi and D. andiana (cf. figs. 4, 8).