Didacna adacnoides Nevesskaja, 1958 † (basis of record)
Didacna agalarovae Bogachev & Gadzhiev, 1967 † (basis of record)
Didacna akschaena G. I. Popov, 1983 † (basis of record)
Didacna alata Bogachev & Gadzhiev, 1967 † accepted as Didacna eulachia Fedorov, 1948 † (source of synonymy)
Didacna alibajramlinica Vekilov, 1969 † accepted as Didacna carditoides Andrusov, 1910 † (source of synonymy)
Didacna aligulica Nevesskaja, 2007 † (original description)
Didacna anomala Nevesskaja, 2007 † (original description)
Didacna apscheronica Geivandova, 1956 † accepted as Didacna delenda Bogachev, 1932 † (source of synonymy)
Didacna artemiana Bogachev, 1932 † (basis of record)
Didacna baeri var. transmittens Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (additional source)
Didacna baericrassa (Pavlov, 1925) † (basis of record)
Didacna bergi Fedorov, 1948 † (basis of record)
Didacna bogatschevi Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (source of synonymy)
Didacna bogatschevi var. opima Pravoslavlev, 1939 † (additional source)
Didacna borisphenica Nevesskaja, 1963 † (basis of record)
Didacna carditoides Andrusov, 1910 † (basis of record)
Didacna carinata Nevesskaja, 2007 (original description)
Didacna catilloides Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna catillus (Eichwald, 1841) † (basis of record)
Didacna catillus devexa G. I. Popov, 1983 † accepted as Didacna miussica G. I. Popov, 1983 † (source of synonymy)
Didacna catillus transcaspica Nevesskaja, 1958 † (basis of record)
Didacna celekenica Fedorov, 1948 † (basis of record)
Didacna charamica Fedorov, 1953 † (basis of record)
Didacna convexa Geivandova, 1956 † accepted as Didacna umbonata Ebersin, 1958 † (source of synonymy)
Didacna corpulenta Zhukov, 1933 † (basis of record)
Didacna cristata Bogachev, 1932 † (source of synonymy)
Didacna curta G. I. Popov, 1983 † (basis of record)
Didacna delenda Bogachev, 1932 † (basis of record)
Didacna dilatata Pravoslavlev, 1939 † (basis of record)
Didacna ebersini Fedorov, 1953 † (basis of record)
Didacna elongatoovata Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (source of synonymy)
Didacna elongatoovata var. bogatschevi Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (additional source)
Didacna emendata G. I. Popov, 1983 † (basis of record)
Didacna eulachia Fedorov, 1948 † (basis of record)
Didacna fedorovi Nevesskaja, 2007 † (original description)
Didacna frequens Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna gibba Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna gilgilica Nevesskaja, 2007 † (original description)
Didacna grimmi Pravoslavlev, 1939 † (additional source)
Didacna gurganica Vekilov, 1969 † (basis of record)
Didacna guriensis Nevesskaja, 1963 † (basis of record)
Didacna hebes Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (source of synonymy)
Didacna hebes var. romboidea Pravoslavlev, 1939 † (additional source)
Didacna hians Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (source of synonymy)
Didacna hospes Vekilov, 1969 † (basis of record)
Didacna hyrcana G. I. Popov, 1983 † (basis of record)
Didacna incrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (source of synonymy)
Didacna incrassata Bogachev, 1932 † accepted as Didacna nalivkini Vassoevich, 1930 † (source of synonymy)
Didacna itilica G. I. Popov, 1983 † (basis of record)
Didacna janischevckii Geivandova, 1956 † accepted as Didacna artemiana Bogachev, 1932 † (source of synonymy)
Didacna karpevitschae Bogachev & Gadzhiev, 1967 † accepted as Didacna porsugelica Nevesskaja, 1958 † (source of synonymy)
Didacna knipovitshi Bogachev & Gadzhiev, 1967 † accepted as Didacna eulachia Fedorov, 1948 † (source of synonymy)
Didacna kolesnikovi Fedorov, 1953 † (basis of record)
Didacna kovalevskii Bogachev, 1932 † (basis of record)
Didacna kurovdagica Vekilov, 1969 † accepted as Didacna charamica Fedorov, 1953 † (source of synonymy)
Didacna lindleyi Fedorov, 1948 † (basis of record)
Didacna lindleyi derupta G. I. Popov, 1983 † (source of synonymy)
Didacna lintriculus Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna lissitzyni G. I. Popov, 1983 † (basis of record)
Didacna mingetschaurica Vekilov, 1969 † (basis of record)
Didacna mischovdagica Vekilov, 1969 † (basis of record)
Didacna miussica G. I. Popov, 1983 † (basis of record)
Didacna monodacnoides G. I. Popov, 1983 † (basis of record)
Didacna nalivkini Vassoevich, 1930 † (basis of record)
Didacna naviculata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna obliquetrigona Pravoslavlev, 1939 † (basis of record)
Didacna obunca G. I. Popov, 1983 † (basis of record)
Didacna olla Nevesskaja, 1963 † (basis of record)
Didacna ostroumovi Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna ovatocrassa Pravoslavlev, 1939 † (basis of record)
Didacna ovatocrassa apscheronica Nevesskaja, 2007 † (original description)
Didacna ovatula Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (source of synonymy)
Didacna pallasi Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (source of synonymy)
Didacna paracrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (source of synonymy)
Didacna parallella Bogachev, 1932 (basis of record)
Didacna parallella var. borealis Fedorov, 1953 † accepted as Didacna parallella Bogachev, 1932 (source of synonymy)
Didacna parvula Nalivkin, 1915 † (basis of record)
Didacna plana Nevesskaja, 1958 † (basis of record)
Didacna pontocaspia (Pavlov, 1925) † (basis of record)
Didacna porsugelica Nevesskaja, 1958 † (basis of record)
Didacna postcarditoides Nalivkin & Anisimov, 1914 † accepted as Didacna nalivkini Vassoevich, 1930 † (source of synonymy)
Didacna praeprotracta Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (source of synonymy)
Didacna praeprotracta var. dubia Pravoslavlev, 1939 † (additional source)
Didacna praetrigonoides Nalivkin & Anisimov, 1914 † (basis of record)
Didacna praetrigonoides abescunica G. I. Popov, 1983 † accepted as Didacna praetrigonoides praetrigonoides Nalivkin & Anisimov, 1914 † (source of synonymy)
Didacna praetrigonoides inderana Svitoch, 1967 † accepted as Didacna praetrigonoides praetrigonoides Nalivkin & Anisimov, 1914 † (source of synonymy)
Didacna praetrigonoides paleotrigonoides Fedorov, 1953 † (basis of record)
Didacna praetrigonoides praetrigonoides Nalivkin & Anisimov, 1914 † (basis of record)
Didacna pravoslavlevi Fedorov, 1948 † (basis of record)
Didacna pravoslavlevi karelini Fedorov, 1953 † (basis of record)
Didacna pravoslavlevi pravoslavlevi Fedorov, 1948 † (basis of record)
Didacna prona Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (source of synonymy)
Didacna protracta (Eichwald, 1841) (status source)
Didacna protracta mangyschlakensis Nevesskaja, 2007 † (original description)
Didacna protracta protracta (Eichwald, 1841) (basis of record)
Didacna protracta raricostata Nevesskaja, 2007 † (original description)
Didacna pseudocrassa (Pavlov, 1925) † (basis of record)
Didacna pseudocrassa pseudocrassa (Pavlov, 1925) † (basis of record)
Didacna pseudocrassa supsae Nevesskaja, 1963 † (basis of record)
Didacna pyramidata (Grimm, 1877) (status source)