Family: Hylidae - Tree Frogs
Order: Anura - Frogs
Class: Amphibia
Phylum: Chordata - Vertebrates
Kingdom: Animalia
Red List status: Least Concern
Adult length: 100 mm
Tadpole length: 63 mm
Northern New Guinea (though more common in the south of the island) to southern New South Wales, Australia. In New Guinea, the species' range extends into Indonesia, while the eastern range encompasses much of northern and eastern Australia, including the entirety of Queensland and most of New South Wales. This frog occurs in all mainland states except Victoria, but in Western Australia it occurs no further south than the Kimberleys. It is absent from the southwestern Northern Territory and from most of South Australia.
Other common names: Green tree frog, dumpy tree frog
Adult:
The green tree frog, as the species is known locally, is Australia's most
readily-r
ecognised
native frog. It is among the country's larger arboreal species and with a
strongly oval, robust body (though slender in subadults) and a blunt snout.
The smooth dorsal surface
is typically a shade of green, but may be olive and may darken in some
specimens at night. The
ventral surface is white and is coarsely granular. The most distinctive
feature is a thick, glandular
supratympanic fold.
The tympanum itself is
prominent but with its upper rim partially obscured by the skin fold.
The skin is typically patternless, but may be flecked with large white spots
along the flanks or with a white stripe from the eye to the arm. The
toe discs are rounded
and enlarged. The toes are three-quarters webbed and the fingers one-quarter
webbed. Maxillary
teeth are present, and
vomerine teeth are
located between the choanae.
Tadpole:
Olive to dark brown, with a strongly arched dorsal fin and commonly a stripe
along the side of the tail. Tadpoles attain the adult colouration shortly
before the emergence of the forelimbs.
Eggs: Dark brown, laid in a mass of up to 4,000 that settles to the bottom of the water column.
Call: A deep, stereotypical slow "croak", typically repeated. Males call from within retreat sites or from vegetation above or near water bodies.
Similar species: Confusion is possible with the white-lipped tree frog (L. infrafrenata), another large species which is common in disturbed areas in tropical Australia and New Guinea. In this species, the supratympanic fold is less fleshy, and a white line is invariably present running along the lower lip (absent in L. caerulea). The white-lipped tree frog and related New Guinean forms also possess white dermal fringes along the sides of the arms and legs, which are absent in White's tree frog. L. infrafrenata also has longer limbs and a more slender profile, with a more pointed snout. In the Kimberley region, this species may be confused with L. splendida; this species, however, possesses large glands on top of the head (normally absent in White's tree frog), and bright orange colouration on the limbs, groin and thigh (the rear of the thigh is dark orange in L. caerulea). L. cavernicola resembles a subadult green tree frog, but has a less pronounced skin fold and the upper rim of the tympanum is distinct. The similar centralian frog (L. gilleni) has a distinctive pattern of small, whitish spots and blotches over the upper surface of the body, and a more angular snout.
Naturally an inhabitant of lowland forest and swamp, but now commonly associated with human-altered habitats including plantations, agricultural land and urban settings, where it is often encountered sheltering in rooms or gardens. The species is not found in dense rainforest, and prefers open woodland habitats.
Reproductive habitat: Swamps, garden ponds, flooded grassland and temporary pools.
Elevation: 0-200 m in New Guinea.
Predominantly arboreal, commonly being found in trees along streams. Animals often wait near artificial lighting to ambush insect prey. The species is most active at night in spring and summer (the wet season, in tropical regions).
Life cycle: Development from egg to metamorph typically takes around six weeks.
Wildlife of Tropical Queensland, The Queensland Museum 2000
Cogger, H. G. (2000) Reptiles & Amphibians of Australia, 6th Edition. Ralph Curtis Publishing: 808 pp
Hero, J-M., Richards, S., Retallick, R., Horner, P., Clarke, J. & Meyer, E. (2004). Litoria caerulea. In: IUCN 2008. IUCN 2008 Red List of Threatened Species
Menzies, J. (2006) The Frogs of New Guinea and The Solomon Islands. Pensoft, Bulgaria: 346pp
Robinson, M. (1993) A Field Guide to Frogs of Australia, Reed New Holland
Litoria caerulea, calling male. Townsville, Queensland, Australia. Note the dull orange colouration of the rear thigh.
