Cosmarium clepsydra var. bicardia
Cosmarium clepsydra var. duplex
Cosmarium clepsydra var. fluviatile
Cosmarium clepsydra var. depressum
Cosmarium clepsydra var. granulatum
Cosmarium clepsydra var. undulatum
Cosmarium clepsydra var. truncatum
Cosmarium clepsydra var. mauricianum
Cosmarium clepsydra var. delaunayi
Cosmarium clepsydra var. dissimile
Cosmarium clepsydra var. hoglandiae
Cosmarium clepsydra var. nanum
Cosmarium clepsydra var. tchadense