Alcalus sariba

Alcalus sariba, also known as Saribau eastern frog[1][2] or Saribau dwarf mountain frog,[3] is a species of frog in the subfamily Alcalinae, family Ceratobatrachidae. It is endemic to Sarawak, Malaysian Borneo, where it is known from a small number of locations, including the eponymous Mount Saribau.[1][2] It has often been included in Alcalus baluensis (=Ingerana baluensis), but is now considered a distinct species.[1][2][3] The two species are similar but Alcalus sariba is larger.[3][4]

Alcalus sariba
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Amphibia
Order: Anura
Family: Ceratobatrachidae
Genus: Alcalus
Species:
A. sariba
Binomial name
Alcalus sariba
(Shelford, 1905)
Synonyms[2]
  • Rana sariba Shelford, 1905
  • Ingerana (Ingerana) sariba (Shelford, 1905)
  • Taylorana sariba (Shelford, 1905)

Description

The holotype is a female measuring 38 mm (1.5 in) in snout–vent length,[4] and the common length for females is 36–38 mm (1.4–1.5 in); the size of the male is unknown.[1] The overall appearance is stocky. The head is relatively big compared to the body. Coloration varies from light to dark brown and includes some darker markings. The adhesive finger discs bear a white cross-bar.[3]

Habitat and conservation

Alcalus sariba occurs along seepage areas close to small streams as well as in leaf litter in primary forest; it does not tolerate habitat disturbance. Breeding biology is unknown but presumably involves direct development (i.e, there is no free-living larval stage[5]), as in other Alcalus.[1]

Alcalus sariba is considered common and occurs in the Santubong National Park, Kubah National Park, and Matang Wildlife Centre. However, outside protected areas it is threatened by habitat loss caused by logging concessions, small scale subsistence logging, and oil palm plantations. Furthermore, Santubong National Park is facing encroachment from housing and tourism development.[1]

References
  1. IUCN SSC Amphibian Specialist Group (2019). "Alcalus sariba". IUCN Red List of Threatened Species. 2019: e.T79934933A95550467. Retrieved 21 June 2020.
  2. Frost, Darrel R. (2020). "Alcalus sariba (Shelford, 1905)". Amphibian Species of the World: an Online Reference. Version 6.1. American Museum of Natural History. doi:10.5531/db.vz.0001. Retrieved 21 June 2020.
  3. Haas, A.; Das, I. & Hertwig, S.T. (2020). "Alcalus sariba Saribau Dwarf Mountain Frog". Frogs of Borneo. Retrieved 21 June 2020.
  4. Inger, R.F. (1966). "The systematics and zoogeography of the amphibia of Borneo". Fieldiana Zoology. 52: 1–402. doi:10.5962/bhl.title.3147.
  5. Vitt, Laurie J. & Caldwell, Janalee P. (2014). Herpetology: An Introductory Biology of Amphibians and Reptiles (4th ed.). Academic Press. p. 166.
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