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Family- Bufonidae (True Toads)

The members of the family bufonidae are characterized by having 
thick, warty dry or glandular skin with shortened forelimbs and hindlimbs used for walking or hopping. There is a concentration of glands in the temporal-neck area forming the prominent parotid gland which stores an alkaloid secretion. The bufonids are generally called toads. Adult toads lack teeth in the upper jaw. The pupil of the eye is horizontal. They reproduce by depositing strands of eggs in water and the eggs hatch in to tadpoles. The tadpoles have keratinized mouthparts. In most species fertilization is external but few are known to fertilize internally. The family Bufonidae is distributed worldwide except Antarctica and Australia. More than 610 species are known throughout the world that belongs to 52 genera (Amphibiaweb). 
Bufonidae of Sri Lanka  
Sri Lanka is home to 6 species of bufonids (Meegaskumbura et al., 2015; Jayawardena et al., 2017). The bufonidae in Sri Lanka consists of two genera: Adenomus and Duttaphrynus. The genus Adenomus is endemic to Sri Lanka.
Genus - Adenomus Cope, 1860
Adenomus species are characterized by their slender habitus and moist  warty skin (Manamendra-Arachchi and Pethyagoda,1998). They have comparatively long limbs with smooth finger edges. Species of Adenomus also lack the supra-orbital ridge which is prominent in Duttaphrynus species. Two species of Adenomus are found in Sri Lanka (Meegaskumbura et al., 2015a). 

Species of Adenomus in Sri Lanka
Adenomus kandianus (Gunther, 1872)E
Adenomus kelaartii  (Gunther, 1858)E

Adenomus kandianus can be distinguished from A. kelaartii by the absence of cranial ridges (vs present in A. kelaartii). Both species are normally found close to water bodies. Out of the two species, A. kandianus was thought to be extinct until it was recently rediscovered from the Sripada Sanctuary (Peak Wilderness Sanctuary) (Wickramasinghe et al., 2012) and Piduruthalagala range (Gabadage et al., 2014)It is restricted to the submontane and montane forests of the Sripada sanctuary and Piduruthalagala range and is found associated with clear fast flowing shallow mountain streams covered by a thick canopy (Meegaskumbura et al., 2015b, Karunarathna et al., 2016). Adenomus kelaartii is distributed in the lowland and sub-montane rainforests of Sri Lanka.

Genus - Duttaphrynus Frost et al., 2006
Four species are known from Sri Lanka. These four species were previously placed in the genus Bufo. But in 2006 they were placed in the new genus Duttaphrynus based on  molecular evidence (Frost et al., 2006). They have a stout, stocky appearance with short legs. Their skin is dry and warty with prominent parotid glands on the head. Duttaphrynus species have prominent bony ridges, such as a canthal, a pre-orbital, a supraorbital, and a postorbital ridge, and a short orbito-tympanic ridge. Their snout is short and blunt, the interorbital space is broader than the upper eyelid and the tympanum is very small. The first finger of these toads extend beyond the second and the toes are half webbed. The finger edges of  Duttaphrynus are granular (rough). Two species are endemic to Sri Lanka. Duttaphrynus melanostictus is the commonest of all toads and maybe the commonest amphibian in Sri Lanka and it is easily seen in home gardens and even inside houses. Duttaphrynus melanostictus can be distinguished by the other Duttaphrynus species of Sri Lanka by the absence of a parietal ridge and by the presence of a large tympanum and large inter-paratoid warts that run up to the anterior level of parotid glands. Duttaphrynus scaber is distributed in the lowlands of Sri Lanka and can be distinguished by the other Duttaphrynus species by the presence of a parietal ridge and rounded parotid glands. Duttaphrynus kotagamai and D. noellertii  are distributed in the lowland rainforests of Sri Lanka (Fernando et al., 1994; Manamendra-Arachchi and Pethyagoda,1998). Duttaphrynus kotagamai is distinguished by all the other Duttaphrynus species of Sri Lanka by the presence of parietal ridge and and elongated and unlobulated parotid glands. Duttaphrynus noellertii can be differentiated by the other Duttaphrynus species of Sri Lanka by the absence of a parietal ridge and by the presence of a small tympanum and small inter-paratoid warts that are limited to the mid level of parotid glands.   
Species of Duttaphrynus in Sri Lanka
Duttaphrynus kotagamai (Fernando and Dayawansa, 1994)E
Duttaphrynus melanostictus (Schneider, 1799)
Duttaphrynus noellertii (Manamendr-Aarachchi and Pethyagoda,1998)E
Duttaphrynus scaber (Schneider, 1799)


Abbreviations in superscript
E- Endemic Species, Ex- Extinct species, Cr- Critically Endangered Species
Fernando, P., Dayawansa, N., Sirwardhana, M. (1994) Bufo kotagamai, a new toad from Sri Lanka. Journal of South Asian Natural History, 1: 119–    
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    Campbell, J.A., Blotto, B.L., Moler, P.E., Drewes, R.C., Nussbaum, R.A., Lynch, J.D., Green, D.M., Wheeler, W.C. (2006) The amphibian tree of life.
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    assessment of the species boundaries of the Sri Lankan torrent toads (Bufonidae: Adenominae: Adenomus) Zootaxa, 3911: 245-261.
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    critically endangered Kandian Torrent Toads (Adenomus kandianus) breed en masse. PeerJ PrePrints, 3: e1964.            
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    rediscovered in Sri Lanka. Zootaxa, 3347: 63–68.