Phrynobatrachus pygmaeus is a species of frog in the family Phrynobatrachidae. It is endemic to the Central African Republic and is only known from its type locality, Bouala (originally spelled "Buala"), at above sea level on the Ouham River. Common name Chad river frog has been coined for this species. This name presumably reflects the earlier assumption that the type locality was in Chad, into which the Ouham River flows. Etymology Presumably, this species is named for the Latin pygmaeus, meaning "dwarfish". Taxonomy Phrynobatrachus pygmaeus was described by German zoologist Ernst Ahl in 1925 based a single specimen, the holotype. Phrynobatrachus pygmaeus is the type species of the genus Micrarthroleptis erected in 1938 by . However, the genus is currently considered a synonym of Phrynobatrachus. Description Phrynobatrachus pygmaeus has tympanum that is indistinct. Dorsal skin is warty and has two X-shaped ridges in the scapular region. Ecology There are no observations of this species after its discovery, and its ecology is essentially unknown. References pygmaeus Frogs of Africa Amphibians of the Central African Republic Endemic fauna of the Central African Republic Amphibians described in 1925 Taxa named by Ernst Ahl Taxonomy articles created by Polbot