It is a member of the Paramecium aurelia species complex.

[1] It is the newest member of the Paramecium aurelia species complex.

The current Paramecium sonneborni strains, so far, reveal very low viability in the generations and are a result of allopatric speciation.

Methods in Cell Biology, 241-339. doi:10.1016/s0091-679x(08)61758-6 Przyboś, Ewa; Tarcz, Sebastian; Rautian, Maria; Lebedeva, Natalia (June 2014).

"The first European stand of Paramecium sonneborni (P. aurelia complex), a species known only from North America (Texas, USA)".