Alcock, A. (1900). Material for a carcinological Fauna of India. No. 6: the Brachyura Catometopa, or Grapsoidea. <em>Journal on the Asiatic Society of Bengal.</em> 69(2): 279-456., available online athttps://biodiversitylibrary.org/page/35612227[details]
DecaNet eds. (2025). DecaNet. Ptychognathus onyx Alcock, 1900. Accessed through: Odido, M.; Appeltans, W.; BelHassen, M.; Mussai, P.; Nsiangango, S.E.; Vandepitte, L.; Wambiji, N.; Zamouri, N. Jiddou, A.M. (Eds) (2025) African Register of Marine Species at: https://www.marinespecies.org/afremas/aphia.php?p=taxdetails&id=207549 on 2026-08-21
Odido, M.; Appeltans, W.; BelHassen, M.; Mussai, P.; Nsiangango, S.E.; Vandepitte, L.; Wambiji, N.; Zamouri, N. Jiddou, A.M. (Eds) (2026). African Register of Marine Species. Ptychognathus onyx Alcock, 1900. Accessed at: https://www.marinespecies.org/afremas/aphia.php?p=taxdetails&id=207549 on 2026-08-21
original descriptionAlcock, A. (1900). Material for a carcinological Fauna of India. No. 6: the Brachyura Catometopa, or Grapsoidea. <em>Journal on the Asiatic Society of Bengal.</em> 69(2): 279-456., available online athttps://biodiversitylibrary.org/page/35612227[details]