Limnomedusa macroglossa (common name: rapids frog) is a species of frog in the family Alsodidae,[2] in the monotypic genus Limnomedusa.

[3] It is found in southern Brazil, northeastern Argentina, Uruguay, and northern Paraguay.

[2] Limnomedusa macroglossa are found in open and forested areas on rocky soil along rivers.

Tadpoles are found in temporary river-side pools[1] and slow-flowing water.

[4] It is threatened by habitat degradation due to agricultural activities, water pollution, hydroelectric development, and pine plantations.