A usually greyish species, but abdomen occasionally ferruginous and often with a blackish median and/or lateral longitudinal stripe.The wing length is 18 to 28 mm. The minimum space between eyes below is at most subequal to the maximum width of antenna! scape ; the antennae are 13-segmented. The male tergite 9 has a short median projection (its breadth at base exceeding its length), and roundly bifurcated at apex, the bifurcations blackish ; sternite 8 simple, 9 almost fused with tergite 9 (as in T. paludosa and T. czizeki). female wings as long as abdomen; sternal valves usually extending to about two-thirds length of cerci, cerci only slightly clubbed at tips.
This species occurs in woodlands with streams and larvae are found in organic rich soil along streams. Mostly found in Europe, probably introduced as an invasive species to North America.