Alcalus
Compared to the closely related genera Cornufer and Platymantis, Alcalus are medium-sized. In Alcalus baluensis and A. mariae, male frogs are  long from nose to rear end and females . The head is wided. Skin is coarse, shagreened, or wrinkled in appearance. These frogs have disks on their toes for climbing, and they are very wide. These frogs have webbed skin between their toes . Male frogs have nuptial pads but no vocal sacs.