Both glassfrogs and the Allophrynidae are closely related to Leptodactylidae .
The glassfrogs differ from Allophryne by having much more delicate skulls and by possessing intercalary elements between the last phalanges of fingers , a process on the third metacarpal , and nonexplosive breeding , among other characteristics .
Both glassfrogs and the Allophryne are closely related to Leptodactylidae .
The glassfrogs differ from Allophryne by having much more delicate skulls and by possessing intercalary elements between the last phalanges of fingers , a process on the third metacarpal , and nonexplosive breeding , among other characteristics .