Classification of the subgenus Productus (Haydenella)
G. †Haydenella Reed 1944
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†Haydenella bihemisphaera Li 1986
†Haydenella bofengensis Zhu 1990
†Haydenella buravasi Grant 1976
†Haydenella chilianshaniana Jin and Ye 1979
†Haydenella deminuta Liao 1980
†Haydenella dutkevitchi Grunt 1973
†Haydenella elongata Liao 1980
†Haydenella eminens Crippa and Angiolini 2012
†Haydenella gefoensis Licharew 1937
†Haydenella granti Yanagida and Nakornsri 1999
†Haydenella heilongjiangensis Lee and Gu 1980
†Haydenella hexigtenica Li and Gu 1976
†Haydenella khasorensis Reed 1944
†Haydenella kiangsiensis Kayser 1883
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Invalid names: Cathaysia striacosta Zhan 1962 [synonym], Haydenella chianensis Chao 1927 [synonym], Haydenella plicata Liang 1990 [synonym], Haydenella qinglongensis Liao 1980 [synonym], Haydenella tumida Waagen 1884 [synonym]
†Haydenella libera Li 1986
†Haydenella longyanensis Zhu 1990
†Haydenella magma Zhu 1990
†Haydenella miaolingensis Lee and Gu 1980
†Haydenella minuta Sarycheva 1965
†Haydenella nanusa Li 1986
†Haydenella nasuta Zeng 1993
†Haydenella paradoxica Shen et al. 1992
†Haydenella salinaria Reed 1944
†Haydenella subextensa Zhan 1979
†Haydenella tersa Li 1986
†Haydenella wangqingensis Lee and Gu 1980
†Haydenella wenganensis Huang 1932
†Haydenella wilczeki Toula 1875
†Haydenella yonganensis Wang et al. 1982
†Haydenella zhejiangensis Liang 1990
†Productus (Haydenella) quaesitus Reed 1944
Invalid names: Chianella Waterhouse 1975 [synonym], Cymoproductus [synonym], Haydenella guangyuanensis Zhan 1989 [nomen nudum], Longyania Zhu 1990 [synonym], Planihaydenella Chang 1987 [synonym], Pseudohaydenella Liang 1990 [synonym]