Astylosternus nganhanus

Astylosternus nganhanus
Conservation status
	; Critically Endangered (IUCN 3.1)[1]
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Amphibia
Order:	Anura
Family:	Arthroleptidae
Genus:	Astylosternus
Species:	A. nganhanus
Binomial name
	Astylosternus nganhanus; Amiet, 1978

Astylosternus nganhanus is a species of frog in the family Arthroleptidae. It is endemic to Cameroon and known from Mount Nganha on the Adamawa Plateau;[2] it is probably endemic to that area.[1] Common name Nganha night frog has been coined for it.[2][3] This poorly known species is only known from five specimens.[1][3]

Description

Adult measure about 45 mm (1.8 in) in snout–vent length. The head is very narrow, triangular, and flattened in shape. The eyes are rather small and do not protrude greatly. The fingers are fairly short and slender. The hind-limbs are relatively short, and the toe tips are not dilates into discs. Skin is smooth, apart for some longitudinal fine wrinkles, in particular on the flanks. The colouration is dark with black patterning. The top of arms and fore-arms have large, raised black bumps. The thighs have only few markings. Dark pigmentation is also present under the throat and along the ventral surfaces.[3]

Habitat and conservation

Astylosternus nganhanus occurs along watercourses in a few narrow gallery forests, and in seepage areas in the nearby grassland, at elevations of 1,400–1,700 m (4,600–5,600 ft) above sea level. Tadpoles probably belonging to this species have been found in rock pools in streams.[1]

This species, known from only a single population, is probably at severe risk from habitat loss caused by smallholder farming activities and subsistence wood extraction. It is not known to occur in any protected areas.[1]

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References

Amiet, J.-L. (2004). "Astylosternus nganhanus". IUCN Red List of Threatened Species. 2004: e.T54420A11140843. doi:10.2305/IUCN.UK.2004.RLTS.T54420A11140843.en.
Frost, Darrel R. (2018). "Astylosternus nganhanus Amiet, 1978". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 14 April 2018.
"74. Nganha Night Frog (Astylosternus nganhanus)". EDGE of Existence programme (Evolutionarily Distinct and Globally Endangered species). Zoological Society of London. Retrieved 14 April 2018.

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[IUCN-1] Amiet, J.-L. (2004). "Astylosternus nganhanus". IUCN Red List of Threatened Species. 2004: e.T54420A11140843. doi:10.2305/IUCN.UK.2004.RLTS.T54420A11140843.en.

[Frost-2] Frost, Darrel R. (2018). "Astylosternus nganhanus Amiet, 1978". Amphibian Species of the World: an Online Reference. Version 6.0. American Museum of Natural History. Retrieved 14 April 2018.

[EDGE-3] "74. Nganha Night Frog (Astylosternus nganhanus)". EDGE of Existence programme (Evolutionarily Distinct and Globally Endangered species). Zoological Society of London. Retrieved 14 April 2018.