The Short-legged Horned Toad (Boulenophrys brachykolos), listed as endangered on the International Union for Conservation of Nature (IUCN) Red List of Threatened Species, is the only known small frog species in Hong Kong belonging to the genus Boulenophrys of the family Megophryidae. A study led by the Division of Science at Lingnan University has found that the Lantau Island population of the Short-legged Horned Toad shows clear genetic divergence from other local populations, along with several notable differences in the mating calls of males. The research team suggests that the Lantau population represents an early stage of speciation. Geographical isolation of Lantau Island from other landmasses likely contributed to these unique evolutionary traits. The team recommends treating the Lantau population as a separate conservation unit in future.
The Short-legged Horned Toad, an endangered species in Hong Kong, is a small frog measuring around 40 mm in length. It is characterised by short hind limbs, small horn-like projections above the eyes, and skin coloration and patterns that closely resemble dead leaves. (The photo shows the Short-legged Horned Toad population on Lantau Island.)
Lingnan University
The study shows that Short-legged Horned Toads are visually almost identical, making evolutionary differences difficult to detect through traditional field surveys alone. (The photo shows the Short-legged Horned Toad population on Hong Kong Island.)
Lingnan University
Calls of the Short-legged Horned Toad population in Lantau Island.
Calls of the Short-legged Horned Toad population in the Kowloon population.
