Family- Ranidae (True Frogs)

There are 338+ species of Ranids in the world in 16 genera. Ranidae is distributed throughout the world except Antarctica. They have smooth moist skin with powerful legs and webbed feet. This family includes small to the largest frog (Goliath Frog-SVL: 300mm) on earth. The pupil is horizontal in most ranids. Their amplexus is axillary. Most species have indirect development with a free living tadpole that has keratinous mouth parts.  
Ranidae in Sri Lanka
The family Ranidae consists only of the genus Hylarana which includes three species in Sri Lanka. 
Genus- Hylarana Tschudi, 1838
Three species are recorded from Sri Lanka and all three are endemic to Sri Lanka.These three species are characterized by their dorso-lateral ridge that runs along the body from snout to vent. They also possesses round digital disks. All three species are closely associated with water. 
Species of Hylarana in Sri Lanka
Hylarana gracilis (Gravenhorst, 1829)E
Hylarana serendipi Biju, Garg, Mahony, Wijayathilaka, Senevirathne and Meegaskumbura, 2014E
Hylarana temporalis (Günther, 1864)E

Hylarana gracilis is is found close to streams lakes and ponds in the lowlands of Sri Lanka up to an elevation of 700m above. m.s.l. Hylarana temporalis is found closed to water bodies in forested regions in the wet and intermediate zones of Sri Lanka. Hylarana serendipi is known only from Singharaja forest.   
Abreviations in superscript
E- Endemic species, Ex- Extinct species, Cr- Critically Endangered species, En- Endangered species