Didacna baeri var. transmittens Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (original description)
Didacna bogatschevi Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna bogatschevi var. opima Pravoslavlev, 1939 † (original description)
Didacna carditoides var. kalickii Pravoslavlev, 1939 † (original description)
Didacna carditoides var. uralica Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna catilloides Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna catilloides var. obtusa Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna catillus var. catillata Pravoslavlev, 1939 † (original description)
Didacna catillus var. dilatata Pravoslavlev, 1939 † accepted as Didacna dilatata Pravoslavlev, 1939 † (original description)
Didacna crassa var. alta Pravoslavlev, 1939 † accepted as Didacna nalivkini Vassoevich, 1930 † (original description)
Didacna elongatoovata Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (original description)
Didacna elongatoovata var. bogatschevi Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna frequens Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna gibba Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna gmelini Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna grimmi var. cuneata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna grimmi var. subquadrata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna hebes Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna hebes var. romboidea Pravoslavlev, 1939 † (original description)
Didacna hians Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (original description)
Didacna incrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna incrassata var. sublimis Pravoslavlev, 1939 † (original description)
Didacna lintriculus Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna naviculata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna obliquetrigona Pravoslavlev, 1939 † (original description)
Didacna obliquetrigona var. triquerta Pravoslavlev, 1939 † (original description)
Didacna ostroumovi Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna ovatocrassa Pravoslavlev, 1939 † (original description)
Didacna ovatula Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (original description)
Didacna pallasi Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (original description)
Didacna pallasi var. angulata Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (original description)
Didacna paracrassa Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna praeprotracta Pravoslavlev, 1939 † accepted as Didacna obliquetrigona Pravoslavlev, 1939 † (original description)
Didacna praeprotracta var. dubia Pravoslavlev, 1939 † (original description)
Didacna praetrigonoides var. incerta Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna praetrigonoides var. obliqua Pravoslavlev, 1939 † (original description)
Didacna praetrigonoides var. paucicostata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna prona Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna roseni Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna roseni var. gibbosa Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna rudis f. tumida Pravoslavlev, 1939 † accepted as Didacna rudis Nalivkin, 1915 † (original description)
Didacna rudis var. amygdaloides Pravoslavlev, 1939 † (original description)
Didacna rudis var. elongata Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna rudis var. oblonga Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna subartemiana Pravoslavlev, 1939 † (original description)
Didacna subartemiana var. aversa Pravoslavlev, 1939 † (original description)
Didacna subcarditoides Pravoslavlev, 1939 † accepted as Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna subcrassa Pravoslavlev, 1939 † (original description)
Didacna subcrassa var. tumulosa Pravoslavlev, 1939 † (original description)
Didacna subimbricata Pravoslavlev, 1939 † (original description)
Didacna sublongipes Pravoslavlev, 1939 † (original description)
Didacna subovalis Pravoslavlev, 1939 † accepted as Didacna vulgaris Andrusov, 1910 † (original description)
Didacna subovalis var. decens Pravoslavlev, 1939 † (original description)
Didacna subovalis var. inflata Pravoslavlev, 1939 † (original description)
Didacna subovalis var. subcompressa Pravoslavlev, 1939 † (original description)
Didacna subpallasi Pravoslavlev, 1939 † accepted as Didacna subcrassa subcrassa Pravoslavlev, 1939 † (original description)
Didacna subpallasi var. parvuloides Pravoslavlev, 1939 † (original description)
Didacna subpyramidata Pravoslavlev, 1939 † (original description)
Didacna subpyramidata var. obtusa Pravoslavlev, 1939 † accepted as Didacna subpyramidata Pravoslavlev, 1939 † (original description)
Didacna subrudis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna subrudis var. pyramidalis Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna subrudis var. trapezoides Pravoslavlev, 1939 † accepted as Didacna grimmi Pravoslavlev, 1939 † (original description)
Didacna surachanica var. monodacnoides Pravoslavlev, 1939 † (original description)
Didacna vicina Pravoslavlev, 1939 † accepted as Didacna subimbricata Pravoslavlev, 1939 † (original description)

South European Russia for Didacna baeri var. transmittens Pravoslavlev, 1939 † 
South European Russia for Didacna bogatschevi Pravoslavlev, 1939 † 
South European Russia for Didacna bogatschevi var. opima Pravoslavlev, 1939 † 
South European Russia for Didacna carditoides var. kalickii Pravoslavlev, 1939 † 
South European Russia for Didacna carditoides var. uralica Pravoslavlev, 1939 † 
South European Russia for Didacna catilloides Pravoslavlev, 1939 † 
South European Russia for Didacna catilloides var. obtusa Pravoslavlev, 1939 † 
South European Russia for Didacna catillus var. catillata Pravoslavlev, 1939 † 
South European Russia for Didacna catillus var. dilatata Pravoslavlev, 1939 † 
South European Russia for Didacna crassa var. alta Pravoslavlev, 1939 † 
South European Russia for Didacna elongatoovata Pravoslavlev, 1939 † 
South European Russia for Didacna elongatoovata var. bogatschevi Pravoslavlev, 1939 † 
South European Russia for Didacna frequens Pravoslavlev, 1939 † 
South European Russia for Didacna gibba Pravoslavlev, 1939 † 
South European Russia for Didacna gmelini Pravoslavlev, 1939 † 
South European Russia for Didacna grimmi Pravoslavlev, 1939 † 
South European Russia for Didacna grimmi var. cuneata Pravoslavlev, 1939 † 
South European Russia for Didacna grimmi var. subquadrata Pravoslavlev, 1939 † 
South European Russia for Didacna hebes Pravoslavlev, 1939 † 
South European Russia for Didacna hebes var. romboidea Pravoslavlev, 1939 † 
South European Russia for Didacna hians Pravoslavlev, 1939 † 
South European Russia for Didacna incrassa Pravoslavlev, 1939 † 
South European Russia for Didacna incrassata var. sublimis Pravoslavlev, 1939 † 
South European Russia for Didacna lintriculus Pravoslavlev, 1939 † 
South European Russia for Didacna naviculata Pravoslavlev, 1939 † 
South European Russia for Didacna obliquetrigona Pravoslavlev, 1939 † 
South European Russia for Didacna obliquetrigona var. triquerta Pravoslavlev, 1939 † 
South European Russia for Didacna ostroumovi Pravoslavlev, 1939 † 
South European Russia for Didacna ovatocrassa Pravoslavlev, 1939 † 
South European Russia for Didacna ovatula Pravoslavlev, 1939 † 
South European Russia for Didacna pallasi Pravoslavlev, 1939 † 
South European Russia for Didacna pallasi var. angulata Pravoslavlev, 1939 † 
South European Russia for Didacna paracrassa Pravoslavlev, 1939 † 
South European Russia for Didacna praeprotracta Pravoslavlev, 1939 † 
South European Russia for Didacna praeprotracta var. dubia Pravoslavlev, 1939 † 
South European Russia for Didacna praetrigonoides var. incerta Pravoslavlev, 1939 † 
South European Russia for Didacna praetrigonoides var. obliqua Pravoslavlev, 1939 † 
South European Russia for Didacna praetrigonoides var. paucicostata Pravoslavlev, 1939 † 
South European Russia for Didacna prona Pravoslavlev, 1939 † 
South European Russia for Didacna roseni Pravoslavlev, 1939 † 
South European Russia for Didacna roseni var. gibbosa Pravoslavlev, 1939 † 
South European Russia for Didacna rudis f. tumida Pravoslavlev, 1939 † 
South European Russia for Didacna rudis var. amygdaloides Pravoslavlev, 1939 † 
South European Russia for Didacna rudis var. elongata Pravoslavlev, 1939 † 
South European Russia for Didacna rudis var. oblonga Pravoslavlev, 1939 † 
South European Russia for Didacna subartemiana Pravoslavlev, 1939 † 
South European Russia for Didacna subartemiana var. aversa Pravoslavlev, 1939 † 
South European Russia for Didacna subcarditoides Pravoslavlev, 1939 † 
South European Russia for Didacna subcrassa Pravoslavlev, 1939 † 
South European Russia for Didacna subcrassa var. tumulosa Pravoslavlev, 1939 † 
South European Russia for Didacna subimbricata Pravoslavlev, 1939 † 
South European Russia for Didacna sublongipes Pravoslavlev, 1939 † 
South European Russia for Didacna subovalis Pravoslavlev, 1939 † 
South European Russia for Didacna subovalis var. decens Pravoslavlev, 1939 † 
South European Russia for Didacna subovalis var. inflata Pravoslavlev, 1939 † 
South European Russia for Didacna subovalis var. subcompressa Pravoslavlev, 1939 † 
South European Russia for Didacna subpallasi Pravoslavlev, 1939 † 
South European Russia for Didacna subpallasi var. parvuloides Pravoslavlev, 1939 † 
South European Russia for Didacna subpyramidata Pravoslavlev, 1939 † 
South European Russia for Didacna subpyramidata var. obtusa Pravoslavlev, 1939 † 
South European Russia for Didacna subrudis Pravoslavlev, 1939 † 
South European Russia for Didacna subrudis var. pyramidalis Pravoslavlev, 1939 † 
South European Russia for Didacna subrudis var. trapezoides Pravoslavlev, 1939 † 
South European Russia for Didacna surachanica var. monodacnoides Pravoslavlev, 1939 † 
South European Russia for Didacna vicina Pravoslavlev, 1939 † 

Neotype PIN 694/1444, identified as Didacna subcrassa Pravoslavlev, 1939
Neotype PIN 694/1455, identified as Didacna subrudis Pravoslavlev, 1939
Neotype PIN 694/1458, identified as Didacna obliquetrigona Pravoslavlev, 1939
Neotype PIN 694/1467, identified as Didacna ovatocrassa Pravoslavlev, 1939

 Type locality

 for Didacna catillus var. dilatata Pravoslavlev, 1939 †

Village of Chernyi Yar, Lower Volga River; Khazarian [details]

 Type locality

 for Didacna obliquetrigona Pravoslavlev, 1939 †

Shore of Lake Baskunchak, Oblast Astrachan, Russia; Lower Khazarian [details]

 Type locality

 for Didacna ovatocrassa Pravoslavlev, 1939 †

Shore of Lake Baskunchak, Oblast Astrachan, Russia; Lower Khazarian [details]

 Type locality

 for Didacna subartemiana Pravoslavlev, 1939 †

Village of Seroglazovka, Lower Volga River, Russia; Lower Khazarian [details]

 Type locality

 for Didacna subcrassa Pravoslavlev, 1939 †

Shore of Lake Baskunchak, Oblast Astrachan, Russia; Lower Khazarian [details]

 Type locality

 for Didacna subimbricata Pravoslavlev, 1939 †

Northeastern shore of Lake Baskunchak, Oblast Astrachan, Russia; Lower Khazarian [details]

 Type locality

 for Didacna sublongipes Pravoslavlev, 1939 †

Village of Nikol’skoe, Lower Volga River, Russia; Lower Khazarian [details]

 Type locality

 for Didacna subpyramidata Pravoslavlev, 1939 †

Northeastern shore of Lake Baskunchak (according to the text of Pravoslavlev) or the Lower Volga near the village ... [details]

 Type locality

 for Didacna subrudis Pravoslavlev, 1939 †

Shore of Lake Baskunchak, Oblast Astrachan, Russia; Lower Khazarian [details]