Classification of the genus Zittelella
G. †Zittelella Ulrich and Everett 1889
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†Zittelella grossa Rigby and Desrochers 1995
†Zittelella pannosa Raymond and Okulitch 1940
†Zittelella typicalis Ulrich and Everett 1890
†Zittelella varians Billings 1861
†Zittelella xinjiangensis Liu et al. 2003