The Palawan water monitor (''Varanus palawanensis'') is a quite large

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

monitor lizard Monitor lizards are lizards in the genus ''Varanus,'' the only extant genus in the family Varanidae. They are native to Africa, Asia, and Oceania, and one species is also found in the Americas as an invasive species. About 80 species are recogn ...

in the

family Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...

Varanidae The Varanidae are a family of lizards in the superfamily Varanoidea within the Anguimorpha group. The family, a group of carnivorous and frugivorous lizards, includes the living genus '' Varanus'' and a number of extinct genera more closely relat ...

. The species is

endemic Endemism is the state of a species being found in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also found elsew ...

to the

Philippines The Philippines (; fil, Pilipinas, links=no), officially the Republic of the Philippines ( fil, Republika ng Pilipinas, links=no), * bik, Republika kan Filipinas * ceb, Republika sa Pilipinas * cbk, República de Filipinas * hil, Republ ...

.Science Daily.com
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Description

''Varanus palawanensis'' can reach total length of (including tail) 2 metres (6,6 ft). The best studied water monitor population of the Philippines is that of Calauit ( Gaulke 1989 ), a small islet belonging to the Calamian Island Group at the north-easterly margin of Palawan Province. Gaulke ( 1989 ) provided morphological data for 167 specimens . The longest specimen had a total length of 1880 mm with parts of its tail missing. The smallest specimen measured only 390 mm from the tip of the tail to the tip of the snout. Latter specimen had a snout-vent length of 14 cm, while the largest measured 78.8 cm . The mean snout-vent length was 54.77 cm.

Taxonomy

''Varanus palawanensis'' has enough differences to be considered a distinct species
from the closely related '' V. salvator'' (water monitor), '' V. marmoratus'' (marbled water monitor), and '' V. rasmusseni''. ''V. palawanensis'' belongs to the

subgenus In biology, a subgenus (plural: subgenera) is a taxonomic rank directly below genus. In the International Code of Zoological Nomenclature, a subgeneric name can be used independently or included in a species name, in parentheses, placed between t ...

'' Soterosaurus'' with these three species and several other species.

Distribution

''Varanus palawanensis'' is found on the islands of

Palawan Palawan (), officially the Province of Palawan ( cyo, Probinsya i'ang Palawan; tl, Lalawigan ng Palawan), is an archipelagic province of the Philippines that is located in the region of Mimaropa. It is the largest province in the country in ...

Busuanga Busuanga, officially the Municipality of Busuanga ( tgl, Bayan ng Busuanga), is a 3rd class municipality in the province of Palawan, Philippines. According to the 2020 census, it has a population of 25,617 people. History Oral tradition has it ...

, Calauit,

Balabac Balabac Island is the southernmost island of the Palawan province, and therefore the westernmost undisputed island in the Philippines, only about north from Sabah, Malaysia, across the Balabac Strait. Administratively, the island forms the main ...

, and

Sibutu Sibutu, officially the Municipality of Sibutu, is a municipality in the province of Tawi-Tawi, Philippines. According to the 2020 census, it has a population of 34,243 people. History Due to an administrative error in the Treaty of Paris, wh ...

References

External links

* (''Varanus palawanensis'', new species, p. 33). Varanus Reptiles described in 2010 Reptiles of the Philippines Endemic fauna of the Philippines Fauna of Palawan {{lizard-stub