Cacosternum Boulenger, 1887, Ann. Mag. Nat. Hist., Ser. 5, 20: 51. Type species: Cacosternum nanum Boulenger, 1887, by monotypy. Placed on the Official List of Generic Name by Opinion 1921, Anonymous, 1999, Bull. Zool. Nomencl., 56: 96-100.
Dainty Frogs (Wager, 1965, Frogs S. Afr.: 167; Passmore and Carruthers, 1978, J. Herpetol. Assoc. Afr., 19: 6; Lambiris, 1990 "1989", Monogr. Mus. Reg. Sci. Nat. Torino, 10: 131).
Froglets (Van Dijk, 1978, J. Herpetol. Assoc. Afr., 17: 16).
Cacos (Passmore and Carruthers, 1978, J. Herpetol. Assoc. Afr., 19: 6; Passmore and Carruthers, 1979, S. Afr. Frogs: 180).
Metal Frogs (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 98).
Southern and eastern Africa.
Poynton, 1964, Ann. Natal Mus., 17: 145-151, provided accounts for the species of South Africa, as did Lambiris, 1988, Lammergeyer, 39: 109-114, for the species of Natal. Channing, 2001, Amph. Cent. S. Afr.: 286-294, and Du Preez and Carruthers, 2009, Compl. Guide Frogs S. Afr.: 362-385, provided keys and accounts for species of southern Africa and noted two unnamed species in KwaZulu-Natal, Rep. South Africa. Van der Meijden, Crottini, Tarrant, Turner, and Vences, 2011, Afr. J. Herpetol., 60: 1-12, provided a tree of exemplar species followed by Pyron and Wiens, 2011, Mol. Phylogenet. Evol., 61: 543-583, in their study of Genbank sequences, who suggested that Cacosternum is paraphyletic with respect to Microbatrachella.
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