Psyllophryne didactyla Izecksohn, 1971, Bol. Mus. Nac., Rio de Janeiro, N.S., Zool., 280: 2. Holotype: EI 4950, by original designation. Type locality: "Sacra Família do Tinguá, Município de Paulo de Frontin, Estado do Rio de Janeiro", Brazil.
Brachycephalus didactylus — Kaplan, 2002, Amphibia-Reptilia, 23: 227.
Izecksohn's Toad (Frank and Ramus, 1995, Compl. Guide Scient. Common Names Amph. Rept. World: 38).
Forests in the central part of the state of Rio de Janeiro, Brazil; Serra das Torres in extreme southern Espíritu Santo, Brazil.
Oliveira, Coco, Pagotto, Pralon, Vrcibradic, Pombal, and Rocha, 2012, Check List, 8: 242-244, provided a record for Espíritu Santo, Brazil, and commented on the range.
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