Comprehensive DescriptionRead full entry
Bufo biporcatus has a moderately-sized but stout body. The females of this species are typically larger than the males. The females have a snout-vent length of 60-80 mm, while males have a snout-vent length of 55-70 mm. Members of this species exhibit two elongated supraparietal ridges between the eyes; the species' name is derived from these ridges. Small and distinct parotoid glands are present. The skin is wrinkled and covered with tubercles. The tympanum is visible and may be circular or somewhat elliptical. Toes are half-webbed (Iskandar, 1998) except for the fourth toe (Church, 1960a). Dorsal coloration is brown (may be a reddish or grayish shade), mottled with darker blotches. Male B. biporcatus generally have red throats (Iskandar, 1998). The color pattern is lighter in populations from east (Lombok) to west (Bali, Java) within the species range (Church, 1960a).
The tadpoles are small, with the tail usually no longer than double the head plus body length, and a denticle formula of I+1-1/III. Papillae are confined to the corner of the mouth, and the mouth is not adapted for stream-dwelling (Iskandar, 1998).
Bufo biporcatus is related to the following species: B. claviger , B. parvus , B. philippinicus , B. divergens , and B. quadriporcatus . In particular, Bufo clavicus and B. divergens resemble B. biporcatus, but B. claviger has an enlarged interorbital ridge behind the eyes, and B. divergens is smaller with a noticeably sloping snout.
The diploid chromosome number is 22, consisting of five pairs of large chromosomes plus six pairs of smaller chromosomes.