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(Welton, 2013)
*Family +Eoptolamnidae (extinct, Late Cretaceous period)
**Genus +Eoptolamna
***+Eoptolamna eccentrolopha
** Genus +Leptostyrax
***+Leptostyrax macrorhiza
** Genus +Protolamna
***+Protolamna sokolovi
***+Protolamna borodini

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