Classification of the genus Sphenaulax
G. †Sphenaulax Zittel 1877
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†Sphenaulax costata Goldfuss 1826
†Sphenaulax globosa Lagneau-Herenger 1962
†Sphenaulax infundibuliforma Rigby et al. 1998
†Sphenaulax irregularis Pisera 1997
†Sphenaulax piriformis Gerasimov 1960
†Sphenaulax pliopetala Wu 1990
†Sphenaulax subargillaceus Gerasimov 1960
Invalid names: Calycospongia Wu and Xiao 1989 [synonym]