Classification of the genus Tetragregnon
G. †Tetragregnon Ormiston and Lane 1976
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†Tetragregnon iowaensis Nestell et al. 2012
†Tetragregnon japonicum Sashida and Tonishi 1985
†Tetragregnon longispinatum Feng et al. 2006
†Tetragregnon nitidus Nazarov and Ormiston 1985
†Tetragregnon pyramidatus Nazarov 1986
†Tetragregnon scalpratus Nazarov and Ormiston 1985
†Tetragregnon sphaericus Nazarov 1986
†Tetragregnon sycamorensis Ormiston and Lane 1976
†Tetragregnon tunicatus Nazarov 1986
†Tetragregnon vimineum Amon et al. 1990
Invalid names: Archaeopyramisa Cheng 1986 [synonym], Tetracircinata Nazarov and Ormiston 1984 [synonym], Tetraspongoactinia Won 1998 [synonym]