This species is known to be from the forests of southern Cameroon, Equatorial Guinea and Gabon. It probably occurs more widely in, and is likely to occur in southwestern Central African Republic and northern Congo. It is present on the island of Bioko (Equatorial Guinea). The southern and eastern limits of the distribution are unclear.
Habitat and Ecology
It lives in leaf-litter on the floor of lowland forest, avoiding marshy areas. It requires tall forest with a closed canopy. Eggs are laid on the forest floor. It breeds by direct development and there is no free-swimming tadpole.
It is generally considered to be a common species.
It is probably adversely affected by forest loss for agriculture, wood and human settlement.
It occurs in several protected areas. Taxonomic research is needed to clarify the identity of this taxon.
There are major taxonomic problems with the genus Arthroleptis through much of Africa. This is likely to be a complex of several species (V. Gvozdik pers.comm., Nov 2012). In many cases, the available names can be referred only to museum specimens, not to animals in the field. This is because the identification of these species frequently depends more on their vocalizations than their morphology. J.-L. Amiet (pers. comm.) considers that Artholeptis adelphus might be a synonym of A. tuberosus.
IUCN SSC Amphibian Specialist Group 2014. Arthroleptis adelphus. In: IUCN 2014