Blue-tailed monitor

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Blue-tailed monitor
Varanidae - Varanus doreanus.JPG
CITES Appendix II (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Varanidae
Genus: Varanus
Subgenus: Euprepiosaurus
Species:
V. doreanus
Binomial name
Varanus doreanus
(Meyer, 1874) [3]
Synonyms [4]
List
  • Monitor doreanusMEYER 1874
  • Varanus kalabeckPETERS & DORIA 1878
  • Varanus kalabeckBOULENGER 1885
  • Varanus kalabeckDE ROOIJ 1915
  • Varanus indicus kalabeckMERTENS 1942
  • Varanus doreanus doreanusBÖHME 1994
  • Varanus doreanus doreanusDE LISLE 1996
  • Varanus indicus kalabeckAVALOS & MARTINEZ CARRION 1997
  • Varanus doreanusAST 2001
  • Varanus (Euprepiosaurus) doreanusZIEGLER et al. 2007
  • Varanus (Euprepiosaurus) doreanusKOCH et al. 2013
  • Varanus doreanusCOGGER 2014
  • Varanus (Euprepiosaurus) doreanusBUCKLITSCH et al. 2016

The blue-tailed monitor, blue-tailed tree monitor or Kalabeck's monitor [3] (Varanus doreanus), [4] is a monitor lizard of the family Varanidae. It belongs to the V. doreanus group of the subgenus Euprepiosaurus. [5]

Contents

Taxonomy

Two subspecies have been described: [6]

The latter has since been elevated to full-species status as Varanus finschi . [4]

Once considered a member of the V. indicus species complex, it now forms its own species complex with V. finschi, V. semotus, and V. yuwonoi , having diverged from the V. indicus species complex 5.8 million years ago. The V. doreanus species complex formed at most 4.1 million years ago. V. doreanus is the most basal and widespread member of this species complex. [5]

Distribution

This species can be found throughout New Guinea, New Britain, the Bismarck Archipelago, Biak, Salawati, and Waigeo. The blue-tailed monitor is also found on mainland Australia on the tip of the Cape York Peninsula. [4] It inhabits rainforest areas, dry streambeds, and riparian zones. [5]

Description

Juvenile, Cape York Peninsula, Australia Varanus doreanus 438187467.jpg
Juvenile, Cape York Peninsula, Australia

The blue-tailed monitor can reach a total length (including the tail) up to 135 cm (53 in). The maximum size record of this species belongs to a male specimen collected from Cape York in 1948, with a total length of 173.5 cm (68 in) despite missing its tail tip. [7]

The body is greyish-blue in colour and covered with round ocelli. The throat is whitish and strongly marbled. The tail shows clearly a double keel. The tail is light blue (hence the common name of this species), which is interrupted by black cross bands. In adults this color partially fades away. Scales on its neck are smooth and oval. [3] It has a yellow tongue, which is a shared characteristic of the V. doreanus species complex. [8]

Ecology

Like other monitors of the V. doreanus species complex, the blue-tailed monitor feeds on a relatively high amount of vertebrate prey such as birds, especially when compared to other monitors of the subgenus Euprepriosaurus. It will also feed on invertebrates such as beetles. [5]

Like many monitor lizards, males fight over females and territory by standing on their hindlegs and grappling with each other.

In Australia, they are predated on by black-headed pythons. [9]

It is sympatric with the mangrove monitor and the peach-throated monitor in many parts of its range. [5]

Bibliography

References

  1. Parker, F.; Oliver, P.; Tallowin, O.; Couper, P.; Hoskin, C.; Amey, A.; Wilson, S. (2018). "Varanus doreanus". IUCN Red List of Threatened Species . 2018: e.T42485703A101751957. doi: 10.2305/IUCN.UK.2018-2.RLTS.T42485703A101751957.en . Retrieved 19 November 2021.
  2. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. 1 2 3 "Monitor-lizards.net". Archived from the original on 2010-02-02.
  4. 1 2 3 4 Reptile-database.reptarium.cz
  5. 1 2 3 4 5 Weijola, Valter (August 2019). "A molecular phylogeny for the Pacific monitor lizards (Varanus subgenus Euprepiosaurus) reveals a recent and rapid radiation with high levels of cryptic diversity". Zoological Journal of the Linnean Society. 186 (4): 1053–1066. doi:10.1093/zoolinnean/zlz002.
  6. EOL
  7. Ziegler, Thomas; Le, Minh (July 2018). "New Records of the Blue-tailed Monitor, Varanus doreanus (Meyer, 1874), Including a Maximum Size Record". Biawak. 12 (1): 48–53.
  8. Weijola, Valter; Donnellan, Stephen C.; Lindqvist, Christer (2016-02-23). "A new blue-tailed Monitor lizard (Reptilia, Squamata, Varanus) of the Varanus indicus group from Mussau Island, Papua New Guinea". ZooKeys (568): 129–154. Bibcode:2016ZooK..568..129W. doi: 10.3897/zookeys.568.6872 . ISSN   1313-2989. PMC   4829673 . PMID   27103877.
  9. Natusch, Daniel; Lyons, Jessica A. (June 2017). "Notes on the Natural History of Blue-tailed Monitors (Varanus doreanus) in Australia". Biawak. 11 (1): 8–14. Retrieved 2020-03-30.