Adults can be seen in several small lakes such as Iso-Mäkijärvi, Pieni-Mäkijärvi, Päälampi and Heinälampi, but not every year. The year 2019 was an exceptual good year for this species.
In general males rest on leaves of Ulpukka (Nuphar lutea). So far, I did not observe any females. Larvae overwinter twice.
They typically raise their abdomen. Larval excuvia have been found in several lakes, but not necessarily in lakes where adults were observed.
The white pterostigmata are clearly visible.
The abdomen is clearly claviform.
Contrary to L. albifrons, L. caudalis has white pterostigmata (seen from above), and more light-blue colouring of the clearly claviform abdomen.
Seen from below (ventral), the pterostigmata are black. Also, the white spots on the lip are missing.
Figure 1. Distribution map exuviae L. caudalis.