Boophis albilabris, the white-lipped bright-eyed frog, is a tree frog of the family Mantellidae, first described by George Albert Boulenger in 1888 as Rhacophorus albilabris before being placed in Boophis, and endemic to Madagascar. It belongs to Mantellidae, a family of at least 237 recognised species found only on Madagascar and the nearby island of Mayotte, within the arboreal subfamily Boophinae, whose members share far more physical and behavioural traits with true tree frogs elsewhere in the world than with the family’s terrestrial or semi-aquatic relatives. Its genus, Boophis, is Madagascar’s “bright-eyed frogs”, a group of nearly 80 recognised species found only on Madagascar and Mayotte, with new species still being described every few months. Boophinae itself was only recognised as a subfamily in 2001, when the genus was moved out of the African and Asian family Rhacophoridae and into Mantellidae.
Identification
As a member of its genus, Boophis albilabris can be expected to show the expanded toe discs and long hindlimbs typical of arboreal tree frogs, along with a vividly patterned iris, often green or blue toward the centre with red, purple or yellow toward the rim, the trait behind the genus’s “bright-eyed frog” name. The common name points to a further field mark, a pale stripe along the lip, visible in a photographed individual from Madagascar. Many Boophis species also have skin translucent enough to reveal internal anatomy, earning the genus the alternate nickname “skeleton frogs”, a trait that converges on the unrelated glass frogs of Latin America. That arboreal build sets Boophis albilabris apart from the family’s other two subfamilies: Mantellinae, which is mostly terrestrial or semi-aquatic, and Laliostominae, a group of relatively large, terrestrial frogs. No published body-length measurement for the species could be confirmed from an openly accessible source at the time of writing.
Habitat and range
The species is endemic to Madagascar, where it lives in subtropical and tropical moist lowland and montane forest, along rivers and intermittent rivers, including heavily degraded former forest. Tolerance of degraded habitat alongside intact forest sets it apart from stricter forest-interior relatives in its genus, though its recorded habitats, rivers and intermittent rivers, show it still depends on watercourses within that range rather than on dry ground away from them. That restriction to a single island is typical of its whole family: Mantellidae is estimated to have colonised Madagascar 76–87 million years ago by dispersing from Asia, producing the dense concentration of single-island endemics, Boophis albilabris among them, that makes Madagascar’s forests and rivers so important for frog conservation.
Behaviour and breeding
No description of the species’ call, breeding behaviour or seasonal activity could be confirmed from an openly accessible source at the time of writing. Its association with rivers and intermittent rivers is consistent with the stream-breeding habit typical of many Boophis species, but that link has not itself been documented for this species in an open source. As in other Boophinae, males most likely rely on an advertisement call to attract mates near water, since the subfamily’s members are arboreal frogs that behave more like typical tree frogs than like their ground-dwelling mantellid relatives; no recording or description of that call for Boophis albilabris itself, however, could be confirmed from an open source.
Conservation
The IUCN category is shown in the facts box above: Least Concern. The species is nonetheless threatened by habitat loss, the same pressure facing much of Madagascar’s forest-dependent wildlife as forest is cleared for agriculture and other uses.
Similar species
Boophis albilabris is one of close to 80 described species in its genus, nearly all of them restricted to Madagascar and Mayotte and sharing the same bright, patterned eyes, long hindlimbs and partly translucent skin, which makes many Boophis species difficult to separate on looks alone. Among described pages, Boophis bottae is a forest-stream relative in the same genus, though the two are told apart mainly by range, elevation and call rather than by the white lip stripe that gives Boophis albilabris its name.