Dipsas williamsi (CARILLO DE ESPINOZA, 1974)
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Dipsas williamsi
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| Higher Taxa | Colubridae (Dipsadinae), Colubroidea, Caenophidia, Alethinophidia, Serpentes, Squamata (snakes) |
| Subspecies | |
| Common Names | E: Williams' Tree Snake |
| Synonym | Sibynomorphus williamsi CARILLO DE ESPINOZA 1974 Sibynomorphus williamsi — CADLE 2007: 248 Sibynomorphus williamsi — WALLACH et al. 2014: 671 Dipsas williamsi — ARTEAGA et al. 2018 |
| Distribution | Peru (Lima) Type locality: Peru, Lima, Jicamarca |
| Reproduction | oviparous |
| Types | Holotype: MUSM 2170, male, paratypes: MUSM, 6 females |
| Diagnosis | Diagnosis: Sibynomorphus williamsi is characterized by a high number of ventral scales (173–182 in males, 181–188 in females), usually 6 supralabials with 3–4 bordering the eye, a relatively short tail (21–24% of total length in males, 19–22% in females), and a head distinctly wider than the neck, with the first dorsal crossband usually extending up onto the wide posterior part of the head. The dorsum is strongly crossbanded from head to tail (35–48 bands; posterior bands might be broken into dorsal and lateral blotches, offset to varying degrees, but they retain their boldness). Anterior crossbands can be twice the width of posterior crossbands, but they are always wider than the pale interspaces, which are 1–2 scale rows wide the length of the body. Sibynomorphus williamsi differs from other species of the genus in western South America as follows (see also previous species accounts). Sibynomorphus vagrans and S. vagus have fewer ventral scales (160 in each case) and different color patterns. Sibynomorphus oligozonatus has a short, blunt snout; a head that is not distinctly wider than the neck; and fewer ventrals in males (145–163 in three specimens). In S. williamsi, the dorsal crossbands (including posterior blotches) are bold the entire length of the body (Figs. 40, 41), whereas in S. oligozonatus, the anterior crossbands are much more well defined than the posterior blotches. Sibynomorphus petersi and S. oneilli differ from S. williamsi in color patterns (see their species accounts) and in having 8 supralabials with 4–5 touching the eye. (Cadle 2007) Unfortunately we had to temporarily remove additional information as this was scraped by multiple AI companies who sell that data to their customers. These details, e.g. detailed descriptions or comparisons (about 5197 characters) are available for collaborators and contributors. Please contact us for details. |
| Comment | Diet: primarily molluscs (T. de Lema, pers. comm., 16 Oct 2015). Habitat: fully arboreal (Harrington et al. 2018). Distribution: see map in Cadle 2007: 253 (Fig. 43). |
| Etymology | Sibynomorphus williamsi was named for Ernest E. Williams (1914-1998), former curator of herpetology and professor of biology at the Museum of Comparative Zoology, Harvard University. |
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