Las ranas sin lengua[cita requerida] (Pipidae), también conocidas como ranas de uñas,[cita requerida] son un clado de anfibios anuros primitivos compuesto por 41 especies que habitan en la región tropical de Sudamérica (género Pipa) y en el África subsahariana (resto de géneros). Estas se caracterizan por la ausencia de lengua, la presencia de un cuerpo aplanado dorsoventralmente y la de membranas interdigitales completas.

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The Pipidae are a family of primitive, tongueless frogs. The 30 species in the family Pipidae are found in tropical South America (genus Pipa) and sub-Saharan Africa (four other genera). These frogs are exclusively aquatic and have numerous morphological modifications befitting their habitat. For example, the feet are completely webbed, the body is flattened, and a lateral line system is present. In addition, pipids possess highly modified ears for producing and receiving sound underwater. They lack a tongue or vocal cords, instead having bony rods in the larynx that help produce sound. They range from 4 to 19 cm (1.6 to 7.5 in) in body length. The fossil record for pipids is relatively good, with 12 extinct species known. Six of these are placed in the extant genus Xenopus, the remainder in extinct genera. These fossils are known from Africa, South America, and the Middle East back to the Lower Cretaceous.

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