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The taxa of the genus    Megasoma    Kirby, 1825 (  Coleoptera  ,   Scarabaeidae  ,   Dynastinae  ) related to    M.   gyas    (Jablonsky in Herbst, 1785) are revised.   Megasoma  ( M. )  gyas   is recognized as a monotypic species restricted to the Caatinga biome of northeastern Brazil.    Megasoma   gyas   rumbucheri    Fischer, 1968, is considered as a new synonym of    M.   gyas   . The “long-horned    M.   gyas   ” is recognized as a separate polytypic species   M.  ( M. )  typhon   (Olivier, 1789) with the nominative subspecies occurring through the Mata Atlântica biome of Brazil, from Bahia to São Paulo states and   M.  ( M. )  typhon   prandii   Milani, 2008 restricted to a small area in the state of Santa Catarina, South Brazil.    Megasoma   gyas   porioni    Nagai is considered as a new synonym of    M.   typhon   typhon   . The “short-horned    M.   gyas   ” occurring in Minas Gerais, São Paulo, and southwestern Bahia, is recognized as a separate new species and described as   M.  ( M. )  hyperion   sp. nov.  The paper includes an historical research and the redescriptions of the other nominal species of the genus. Distribution maps and a key to species in the   M.  ( M. )  gyas   species group (males and females) are also provided.

zookeys

Revision of the    Megasoma    (     Megasoma   )        gyas    (Jablonsky in Herbst, 1785) species group (  Coleoptera  ,   Scarabaeidae  ,   Dynastinae  )