Clear-water-specialist
Guides
Ischnura erratica
Swift Forktail
Ischnura erratica, the swift forktail, is a robust damselfly native to the Pacific Northwest. Adults are 30–35 mm long with a wingspan of 35–40 mm. Males display distinctive blue and black coloration with a forked tail on abdominal segment 10, while females occur in two color phases. It is one of the earliest damselflies to emerge each year and breeds in clear waters across diverse aquatic habitats.