NATURAL HISTORY · CATALOGUE RECORD
Williams' Tree Snake
Dipsas williamsi (Carillo de Espinoza, 1974)
Source-backed taxonomic record
Accepted species in Catalogue of Life’s 11 September 2026 base release. This preserves the source classification and available supporting data; it is not a completed species monograph.
Open encyclopedia reference
Dipsas williamsi, also known commonly as Williams's tree snake, is a species of nonvenomous snake in the subfamily Dipsadinae of the family Colubridae. The species is endemic to Peru. It was named in honor of Ernest Edward Williams by Nelly Carrillo de Espinoza (1974).
Wikipedia contributors, Dipsas williamsi; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T09:00:25.584147+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Dipsas williamsi (Carillo de Espinoza, 1974)
- Name authority
- (Carillo de Espinoza, 1974)
- Common name
- Williams' Tree Snake
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Squamata
- Family
- Colubridae
- Genus
- Dipsas
- Extinction status
- Not supplied by this source
Classification family tree
Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.
- domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
- kingdomAnimalia
- phylumChordata
- subphylumVertebrata
- infraphylumGnathostomata
- parvphylumOsteichthyes
- megaclassTetrapoda
- classReptilia Laurenti, 1768
- orderSquamata Oppel, 1811
- suborderSerpentes Linnaeus, 1758
- infraorderAlethinophidia Nopcsa, 1923
- familyColubridae
- subfamilyDipsadinae
- genusDipsas
- speciesDipsas williamsi (Carillo de Espinoza, 1974)
Close classified relatives
These entries share the source’s genus, Dipsas. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| American Snail-eaterDipsas articulata (Cope, 1868) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Neotropical Snail-eaterDipsas bucephala (Shaw, 1802) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Catesby's Snail-eaterDipsas catesbyi (Sentzen, 1796) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Dipsas chaparensis Reynolds & Foster, 1992 | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Dipsas copei (Günther, 1872) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Dipsas ellipsifera (Boulenger, 1898) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Graceful Snail-eaterDipsas gracilis (Boulenger, 1902) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Jan's Snail-eaterDipsas incerta (Jan, 1863) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Werner's Thirst SnakeDipsas maxillaris (Werner, 1910) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Variegated Snail-eaterDipsas variegata (Duméril, Bibron & Duméril, 1854) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Vermiculate Snail-eaterDipsas vermiculata Peters, 1960 | ColubridaeChordata | Accepted speciesExtinction status not supplied |
| Tropical Snail-eaterDipsas sanctijoannis (Boulenger, 1911) | ColubridaeChordata | Accepted speciesExtinction status not supplied |
Names & synonyms
Names explicitly linked to this accepted taxon in the source. Synonymy can change with revision.
| Recorded name | Source status |
|---|---|
| Sibynomorphus williamsi Carillo de Espinoza, 1974 Carillo de Espinoza, 1974 | synonym |
Documented distribution
Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.
Source literature & publication evidence
References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.
- https://reptile-database.reptarium.cz/species?genus=Dipsas&species=williamsi Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references
Origins, evidence & remaining research
Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.
Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record. A suitable sourced image remains to be added.
Dataset citation & attribution
This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11
Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.
Stable key: col:8GPNC. Classification follows source parent identifiers. English common names may vary by region.