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Geological dating
Eocene [55.8-33.9 Ma] according to Szwedo & Stroinski (2001): 95
Bartonian [41.2-37.8 Ma] according to Brysz & Szwedo (2018): 7
Lutetian [47.8-41.2 Ma] according to Brysz & Szwedo (2018): 7
1 Type specimen(s)
Holotype ♂ of Ptychogroehnia reducta† Szwedo & Stroinski, 2001 deposited in Geologisch-Paläontologisches Institut, Hamburg Universität, Hamburg according to Szwedo & Stroinski (2001): 99