Classification of the subfamily Tretodictyinae
Subfm. Tretodictyinae Schulze 1887
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G. Hexactinella Carter 1885
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Subg. Hexactinella (Parahexactinella) Reid 1963
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Hexactinella (Parahexactinella) latum Schulze 1887
†Hexactinella alpina Lagneau-Herenger 1962
†Hexactinella calolepis Brimaud and Vachard 1986
†Hexactinella clampensis Frisone et al. 2016
†Hexactinella nymphaea Defretin-Lefranc 1960
†Hexactinella prisca Mehl and Fürsich 1997
G. Tretodictyum Schulze 1887
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†Tretodictyum loeschmanni Schrammen 1912
†Tretodictyum pfaffi Schrammen 1912