Ornate monitor

Varanus ornatus is an obsolete name of monitor lizards native to West and Middle Africa.[1][2] Comprehensive molecular analyses of the group have demonstrated that animals previously assigned to "Varanus ornatus" do not constitute a valid taxon and are actually polymorphisms of two different species; Varanus stellatus and Varanus niloticus.[1] Consequently Varanus ornatus is considered a synonym of Varanus niloticus and "ornate monitor" is a casual term that refers to forest forms of either species (V. niloticus or V. stellatus). Until 1997, the ornate monitor was considered a subspecies of the Nile monitor.[3] It was subsequently described as a separate species on the basis of reduced number of ocelli rows on the body, a light coloured tongue and a more massive build.[4] More recent work based on a large sample size using mitochondrial and nuclear DNA sequences indicates that Varanus ornatus is not a valid species and that animals with the diagnostic appearance belong either of two sister species of Nile monitor.[1] Animals described as ornate monitor lizards are native to closed canopy forests in West and Middle Africa.[1]

Description

Detail of head and claws
Adult female ornate monitor (V. ornatus)

The back is dark – olive green to black – with cross bands of yellow or cream color ocelli plus additional bands on the tail. The ventral side is yellowish with gray banding. The number of ocelli bands on the body, four, or five, was supposed to distinguish V. ornatus from V. niloticus, which has from six to nine. The markings fade somewhat as the animal matures.[5][6] Ornate monitors are quite large and can grow up to two metres in length.

References

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  1. 1 2 3 4 Dowell, S.A, D.M. Portik, V. de Buffrenil, I. Ineich, E. Greenbaum, S.O. Kolokotronis and E.R. Hekkala. (2015). Molecular data from contemporary and historical collections reveal a complex story of cryptic diversification in the Varanus (Polydaedalus) niloticus Species Group. Molecular Phylogenetics and Evolution. doi:10.1016/j.ympev.2015.10.004
  2. ↑ Varanus ornatus
  3. ↑ Mertens. Abh. senckenb. naturf. Ges. Frankfurt am Main, 465:177; 466:327.
  4. ↑ Böhme, W., & Ziegler, T. (1997). A taxonomic review of the Varanus (Polydaedalus) niloticus (Linnaeus, 1766) species complex. The Herpetological Journal 7: 155-162.
  5. ↑ "Ornate Nile monitor". Toronto Zoo. Retrieved 2013-10-06.
  6. ↑ "Nile monitor, Water leguaan". Mampam Conservation. Retrieved 2013-10-06.


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