NATURAL HISTORY · CATALOGUE RECORD
Roughneck Monitor
Varanus rudicollis (Gray, 1845)
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
The black rough-necked monitor (Varanus rudicollis) is a species of monitor lizard found in Southeast Asian countries of Thailand, Burma, and Malaysia. It is also found in Indonesia on Sumatra and islands of the Riau Archipelago It is sometimes known simply as the roughneck monitor. In Thailand is called h̄èā cĥāng (Thai: เห่าช้าง; "elephant bark/roar").
The habitat of Varanus rudicollis is limited to primary and secondary rainforest and mangrove swamps. In the wild the black rough-necked monitor is very rarely seen, but whether this is because of its rarity or its very secretive behavior is uncertain. They are often kept successfully in captivity, but have a shy disposition.
This species is most closely related to its sister group, the water monitor species complex (e.g., the Asian water monitor) which are also in the subgenus Soterosaurus, having split from them 14 million years ago in the middle Miocene.
Wikipedia contributors, Roughneck monitor; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T06:38:01.565612+00:00. This reference remains separate from the taxonomic record.
Identity & source status
- Scientific name
- Varanus rudicollis (Gray, 1845)
- Name authority
- (Gray, 1845)
- Common name
- Roughneck Monitor
- Rank
- species
- Accepted status
- accepted
- Kingdom
- Animalia
- Phylum
- Chordata
- Class
- Reptilia
- Order
- Squamata
- Family
- Varanidae
- Genus
- Varanus
- 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
- suborderAutarchoglossa
- familyVaranidae
- genusVaranus
- speciesVaranus rudicollis (Gray, 1845)
Close classified relatives
These entries share the source’s genus, Varanus. They are not necessarily the closest relatives established by molecular evidence.
| Species | Classification | Source status |
|---|---|---|
| Solomon Island Spiny MonitorVaranus spinulosus Mertens, 1941 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Kimberley Rock MonitorVaranus glauerti Mertens, 1957 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Varanus finschi Böhme, Horn & Ziegler, 1994 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Southern Pilbara Rock GoannaVaranus hamersleyensis Maryan, Oliver, Fitch & O'Connell, 2014 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Mitchell's Water MonitorVaranus mitchelli Mertens, 1958 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Varanus mabitang Gaulke & Curio, 2001 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Varanus nuchalis (Günther, 1872) | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Nesterov’s desert monitorVaranus nesterovi Böhme, Ehrlich, Milto, Orlov & Scholz, 2015 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Banggai Island monitorVaranus melinus Böhme & Ziegler, 1997 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Blue Tree MonitorVaranus macraei Böhme & Jacobs, 2001 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Komodo DragonVaranus komodoensis Ouwens, 1912 | VaranidaeChordata | Accepted speciesExtinction status not supplied |
| Varanus zugorum Böhme & Ziegler, 2005 | VaranidaeChordata | 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 |
|---|---|
| Uaranus rudicollis Gray, 1845 Gray, 1845 | synonym |
| Varanus swarti Mangili, 1962 Mangili, 1962 | synonym |
| Varanus scutigerulus Barbour, 1932 Barbour, 1932 | ambiguous 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=Varanus&species=rudicollis 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:7FG75. Classification follows source parent identifiers. English common names may vary by region.