Thienemann, 1935
Orthocladius (Euorthocladius) can be distinguished from other Orthocladius by the mentum which has 7-9 pairs of lateral teeth or when 6 pairs Orth (Eu) thien labrum the head is light brown instead dark brown or yellow to yellow-brown.
Diversity
European species: 6
Treated species:
Orthocladius frigidus
Orthocladius luteipes
Orthocladius rivicola
Orthocladius rivulorum
Orthocladius thienemanni