Tychus mutabilis species group (Sabella & Kurbatov 2002)

Note. Sabella and Kurbatov (2002) pointed out that based on many external and aedeagal characters, Tychus anser Sabella & Kurbatov 2002 is very similar to the species of mutabilis group, but nevertheless was left unassigned to a species group. The discovery of Tychus spurius convinced us to include T. anser in this group now.