Classification of the genus Holopella

G. †Holopella M'Coy 1851
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†Holopella altera Perner 1903
†Holopella communis Perner 1903
†Holopella contraria Perner 1903
†Holopella deleta Perner 1903
†Holopella dextra Perner 1903
†Holopella expandens Perner 1903
†Holopella gracilior M'Coy 1851
†Holopella jovialis Perner 1903
†Holopella latispira Grabau 1936
†Holopella mira Winchell 1863
†Holopella modesta Perner 1903
†Holopella parvula Perner 1903
†Holopella regularis Lindström 1884
†Holopella tenera Perner 1903
†Holopella teres Lindström 1884
†Holopella trimorpha Waagen 1880