species is confined to the northern parts of the Holarctic regions;
the circumpolar distribution area extends from Central and Northern
Europe, throughout Siberia to North America (Mohrig 1969, Schaffner
et al. 2001, Becker et al. 2003).
stages live in temporary or semi-permanent water bodies, in peat
bogs, forest ponds and ditches, sometimes in open marshes and rock
pools (Peus 1929, Peus 1939, Schaffner et al. 2001, Becker et al.
2003). Mohrig (1969) notes that O. diantaeus is typical
for moors. Rettich et al. (1978) found larvae in periodic breeding
places at the border of a deciduous forest. Wood et al. (1979) suggest
that the long antennae of the larval stages may indicate a peculiar
species is monocyclic; larvae appear in mid or late spring (Mohrig
1969), stemmed from overwintering eggs (Schaffner et al. 2001).
Adults emerge from May onwards to July and are present during the
summer months (Mohrig 1969, Rettich et al. 1978, Schaffner et al.
feed on mammals, including man, mainly at dusk and down (Mohrig
1969). Transmissions of parasitic diseases to humans are not known
at present (Schaffner et al. 2001).