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problematicus Herbst, 1786
ssp. problematicus Herbst, 1786
ssp. harcyniae Sturm, 1815
ssp. inflatus Kraatz, 1878
ssp. planiusculus Haury in Géhin, 1885
ssp. feroensis Lapouge, 1910
ssp. holdhausi Born, 1911
ssp. strandi Born, 1926
ssp. islandicus Lindroth, 1968

* indeterminate subspecies