The commonest and most widespread Gomphus in much of our area. It is darker than all other species, with a greener ground colour and more extensive black markings.
Total: 45-50 mm.
Hindwing: 28-33 mm.
Middle and lower sections of rivers and streams. Favours a calm flow and sandy bottom, avoiding small, fast-flowing, rocky-bottomed waters. Locally abundant in reservoirs, gravel pits and large lakes. The larvae burrow in fine sand, preferably covered with detritus.
From May to August. Typically emerges in great numbers in a short period in spring, followed by a short flight season.
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.
The only Ophiogomphus species in our area. It has a similar appearance to a Gomphus, but is heavier and is characteristically three-coloured, with an apple-green head and thorax, and a black-and-yellow abdomen. It is a typical summer gomphid of many sandy lowland rivers.
Total: 50-60 mm.
Abdomen: 37-42 mm.
Hindwing: 30-36 mm.
Small highland rivers to large lowland rivers, most abundant in lower sections of large rivers with a sandy bottom. The larvae prefer to burrow in gravel and sand.
From June to September.