^A new genus and two new species of the tribe Pachyrhynchini (Coleoptera: Curculionidae) from Palawan Island, the Philippines. Yoshitake H, Esakia, 2013, Volume 53, pages 1-8 (link)
Schönherr, C.J. 1826: Curculionidum dispositio methodica cum generum characteribus, descriptionibus atque observationibus variis seu Prodromus ad Synonymiae Insectorum, partem IV. Fleischer, Lipsiae: X + 338
Alonso-Zarazaga, M.A.; Lyal, C.H.C. 1999: A world catalogue of families and genera of Curculionoidea (Insecta: Coleoptera) (excepting Scolytidae and Platypodidae). Entomopraxis, Barcelona
Yap, S. 2008: Checklist of the Metapocyrtus complex (Curculionidae: Entiminae: Pachyrrhynchini) of the Philippines. Asia life sciences, 17 (2): 240-260