• Ptychognathus Stimpson, 1858
• Ptychognathus affinis De Man, 1895
• Ptychognathus altimanus (Rathbun, 1914)
• Ptychognathus amikee Hsu & Shih, 2024
• Ptychognathus andamanensis Pretzmann, 1984
• Ptychognathus andamanica Alcock, 1900 accepted as Ptychognathus andamanicus Alcock, 1900
• Ptychognathus andamanicus Alcock, 1900
• Ptychognathus barbatus (A. Milne-Edwards, 1873)
• Ptychognathus capillidigitatus Takeda, 1984
• Ptychognathus crassimanus Finnegan, 1931
• Ptychognathus demani Roux, 1917
• Ptychognathus dentatus De Man, 1892
• Ptychognathus easterana Rathbun, 1907 accepted as Ptychognathus easteranus Rathbun, 1907
• Ptychognathus easteranus Rathbun, 1907
• Ptychognathus glaber Stimpson, 1858
• Ptychognathus glaber andamanensis Pretzmann, 1984 accepted as Ptychognathus andamanensis Pretzmann, 1984
• Ptychognathus guijulugani Rathbun, 1914
• Ptychognathus hachijoensis Sakai, 1955
• Ptychognathus insolitus Osawa & Ng, 2006
• Ptychognathus intermedius (De Man, 1879)
• Ptychognathus ishii Sakai, 1939
• Ptychognathus johannae Rathbun, 1913
• Ptychognathus lipkei Ng, 2010
• Ptychognathus makii Hsu & Shih, 2020
• Ptychognathus ngankeeae de Mazancourt, Mazel, Marquet, Poupin & Keith, 2024
• Ptychognathus onyx Alcock, 1900
• Ptychognathus pilipes (A Milne-Edwards, 1868)
• Ptychognathus pilosus De Man, 1892
• Ptychognathus polleni De Man, 1895
• Ptychognathus pusillus Heller, 1865
• Ptychognathus riedelii (A Milne-Edwards, 1868)
• Ptychognathus riedelii var. pilosa De Man, 1892 accepted as Ptychognathus pilosus De Man, 1892
• Ptychognathus sakaii Hsu, Shih & Li, 2022
• Ptychognathus similis de Mazancourt, Mazel, Marquet, Poupin & Keith, 2024
• Ptychognathus spinicarpus Ortmann, 1894
• Ptychognathus stimpsoni Hsu & Shih, 2020
• Ptychognathus takahashii Sakai, 1939 accepted as Ptychognathus takahasii Sakai, 1939
• Ptychognathus takahasii Sakai, 1939