Figure 1. Distribution and species richness of Oriental tiny frogs of the genus Microhyla.

Heatmap indicates approximate number of sympatrically co-occurring species (from 1 to 9); the highest species richness is observed in southern Vietnam and Malayan Peninsula. The individual species geographic range maps were adopted from the AmphibiaWeb (2020) database, and modified based on expert estimations in CorelDraw Graphics Suite X8. Grey/white dashed lines mark international borders on land/water, respectively. Base Map created using simplemappr.net. Photo shows Microhyla heymonsi—a widespread species occurring in Southeast and East Asia (by Nikolay A. Poyarkov).