Friday, July 15, 2011

[Herpetology • 2012] Notes on A Rare Bornean Bufonid Ansonia latidisca Inger, 1966 || Borneo Rainbow Toad or Sambas Stream Toad reappearing in Borneo after 87 years

  Body in lateral view of adult female Borneo Rainbow Toad, or Sambas Stream Toad Ansonia latidiscaapproximately 51 mm. in length 
photo: Indraneil Das 

Sambas Stream Toad | Ansonia latidisca Inger, 1966

On the basis of three female specimens collected recently, some aspects of a little known Bornean bufonid, Ansonia latidisca, are reported. On the mitochondrial phylogenetic tree, the species is basal to the group consisting of some Bornean species, and most Peninsular Malaysian and Thailand species, which is sister to the other group consisting of the remaining Bornean species, several Philippine species, and one Peninsular species. This relationship indicates that the the genus Ansonia has originated within Borneo. Superficial similarity of the species with Sabahphrynus maculatus is thought be the result of convergence in adaptation to an arboreal life.

Keywords: Ansonia, Borneo, Phylogeny, Rare species, Sabahphrynus

Type locality: "Mount Damus, Sambas, Kalimantan", Indonesia (Borneo).
Holotype: RMNH 10677.

Head in lateral view of adult female Borneo Rainbow Toad, also referred to as Sambas Stream Toad (Ansonia latidisca) © Indraneil Das

View of summit of Gunung Penrissen, Sarawak, Malaysian Borneo - type locality of Ansonia latidisca.
photo: Indraneil Das 

Not seen since the 1950s this species was endemic to Borneo. Known as the Sambas Stream toad (Ansonia latidisca), researchers believe logging may have destroyed their water habitat.
Illustration by: Fieldiana Zoology.
Reproduced in Inger (1966)

Masafumi Matsui, Kanto Nishikawa, Siew Teck Yeo and Koshiro Eto. 2012. Notes on A Rare Bornean Bufonid Ansonia latidisca Inger, 1966, with Special Reference to its Phylogenetic Position. Current Herpetology. 31(2); 87-96. DOI: 10.5358/hsj.31.87

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