Phrynobatrachus ruthbeateae Rödel, Doherty-Bone, Kouete, Janzen, Garrett, Browne, Gonwouo, Barej & Sandberger 2012

Phrynobatrachus ruthbeateae is a small frog with a small oval, compact body with a black lateral face mask, absent eyelid cornicle but with large warts on the upper eyelids, scapular ridges converging in a straight line, dorsal skin that is lightly granular to smooth, large white warts on the flanks, white belly, yellow groin area and lower thighs, distinct fingertip and toetip discs, and well developed webbing. Mature males have a snout-vent length of 17.2-17.8 mm and mature females can have a snout-vent length of up to 19.7 mm. This species has a short, round snout when viewed from above and from the side, as well as a rounded canthus. The loreal region is straight, and the head directly behind the eyes has a width of 6.3 mm. The laterally positioned eyes are medium sized (2.8 mm diameter) and lie 1.5 mm away from the nostrils. The nostrils, also laterally positioned, are small and round and are 1.0 mm away from the snout tip. Phrynobatrachus ruthbeateae has an internarial distance of 2.1 mm and an interorbital distance of 2.2 mm. Its pupils are round and the supratympanal ridge extends from the posterior corner of the eye to the base of the forearms; the tympanum is found and indistinct with a diameter of 1.0 mm. Its upper and lower maxillae and praemaxillae have minute teeth hidden by its lips; it lacks vomerine teeth. This species has a heart-shaped tongue with a distinctly notched tip; the anterior attachment of the tongue has median papilla. The choanae is small and round. It has slender forelimbs: the upper arm is 4.0 mm and the lower arm is 3.4 mm. The hand to the tip of the third finger has a length of 4.6 mm; the carpal tubercles are large and the inner hand is oval-shaped while the outer hand is round. There are no carpal glands. The fingers have small, round subarticular tubercles and there are no other tubercles on the hands. Fingers 2 and 4 are the same length, and finger 3 is the longest. There is no manual webbing, and the fingertips are broadened to form small discs. The thumb (finger 1) is slightly swollen without distinct nuptial pads. The hind limbs are also short and slender: the femur is 8.5 mm and the tibia is 8.9 mm. The tibia length is equal to roughly one half the snout-vent length, and the foot including the longest toe is 12.3 mm. There are no glands on the thighs, but this species has tarsal tubercles. There is a long and narrow internal metatarsal tubercle 1.0 mm in length (approximately 2/3 the length of finger 1) and a small round metatarsal tubercle. The relative toe length, in ascending order, is 1, 2, 3 ,4. The digits have well-developed basal webbing (toe 1: 0.5 mm; tow 2: 1.0 mm; toe 3: 1.5 mm; toe 4: 2.5-3.0 mm, toe 5: 1.0 mm). The skin fringes extend toward the tips of the toes, which are enlarged discs (Rödel et al. 2012).Sexual Dimorphism: Female Phrynobatrachus ruthbeateae have thinner fingers than males, with more conspicuous finger discs. Females are also black on the back and upper part of the head; they have a dorsal pattern with beige flanks whereas males have a uniformly light brown to reddish brown dorsal pattern. Females have extended scapular ridges along the dorsolateral line, a white and smooth throat, uniformly black lower mandibles, and no spines on the throat. Males can be distinguished by their black throats with large black spines anteriorly; they have an almost uniform brown to reddish brown dorsal pattern (Rödel et al. 2012).Diagnosis: Phrynobatrachus ruthbeateae can be distinguished from other members of the Phrynobatrachus subgenus by its small body size (

Phrynobatrachus ruthbeateae is found in the leaf litter of almost undisturbed rainforests in south-eastern Cameroon. They mostly live in swamps and experience about 1700 mm annual rainfall. Phrynobatrachus ruthbeateae is thus far known only from its type locality but likely is more widespread in lowland rainforest, speculated to occur south of the Sanaga River. Without further evidence, the authors suggest an IUCN classification of Data Deficient (Rödel et al. 2012).

Male Phrynobatrachus ruthbeateae call during the day while concealed underneath leaves. The calling males sit near small puddles, where they breed, and individuals are spaced very far apart from each other. The calls are comprised of a fast series of brief metallic clicks, and sound almost identical to the call of Phrynobatrachus phyllophilus (Rödel et al. 2012).