The most common and widespread Onychogomphus species and the only one occurring in large parts of Europe. Males perched on streamside rock, with their claspers raised, are a typical sight in the summer, especially in the south.
Total: 46-50 mm.
Abdomen: 31-37 mm.
Hindwing: 25-30 mm.
Largely unshaded (usually rocky) rivers and streams. Occasionally occurs at large lakes.
From May to September.