''Ptychadena'' is a genus of

frog A frog is any member of a diverse and largely semiaquatic group of short-bodied, tailless amphibian vertebrates composing the order (biology), order Anura (coming from the Ancient Greek , literally 'without tail'). Frog species with rough ski ...

s in the grassland frog family,

Ptychadenidae Ptychadenidae is a family of frogs commonly known as the grassland frogs. These frogs occur in Sub-Saharan Africa Sub-Saharan Africa is the area and regions of the continent of Africa that lie south of the Sahara. These include Central A ...

. They are distributed in

Sub-Saharan Africa Sub-Saharan Africa is the area and regions of the continent of Africa that lie south of the Sahara. These include Central Africa, East Africa, Southern Africa, and West Africa. Geopolitically, in addition to the list of sovereign states and ...

, as well as

nilotic The Nilotic peoples are peoples Indigenous people of Africa, indigenous to South Sudan and the Nile Valley who speak Nilotic languages. They inhabit South Sudan and the Gambela Region of Ethiopia, while also being a large minority in Kenya, Uga ...

Egypt Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...

. The common names of this genus are ridged frogs and grass frogs. This type of family have many different characteristics such as the species, '' Ptychadena neumanni'' who have long hindlimbs and a large ear drum compared to the '' Ptychadena erlangeri, for example.'' They also have a unique bone structure which is a fusion between the presacral vertebrae and

sacrum The sacrum (: sacra or sacrums), in human anatomy, is a triangular bone at the base of the spine that forms by the fusing of the sacral vertebrae (S1S5) between ages 18 and 30. The sacrum situates at the upper, back part of the pelvic cavity, ...

Species

The following species are recognised in the genus ''Ptychadena '':

References

Ptychadenidae Amphibians of Africa Amphibian genera Taxa named by George Albert Boulenger {{ranoidea-stub