Black Darter
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| Sympetrum danae |
The Black Darter is Britain's smallest resident dragonfly. It is a very active late summer insect typical of heathland and moorland bog pools.
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[edit] Identification
Both sexes have black legs and pterostigma and a very broad base to the hind wing. The thorax has yellow sides separated by a bold black panel in which are three yellow spots, resembling a Highland Darter.
The male has a mainly black thorax and abdomen. The abdomen has small yellow marks on the side, that darken with age. The wings are clear.
The female has black legs and brown eyes. The abdomen is mainly yellow, becoming browner with age. It has small yellow patches at the wing bases.
[edit] Breeding
This Darter is restricted to acidic shallow pools, lake margins and ditches in lowland heath and moorland bogs, usually with bog-mosses and rushes.
Eggs are laid in flight by dipping the tip of the abdomen into the water. The eggs hatch the following Spring and the larvae develop very rapidly, emerging after as little as two months.
[edit] Behaviour
Males frequently bask in the sun, on open ground. The flight action is rather skittish resembling the Ruddy Darter. Males are not territorial, but actively seek out females.
[edit] Population and Conservation
In Britain, this dragonfly is very locally distributed in the lowlands, but more widespread in the north-west and Ireland. It is often very locally abundant and maybe this triggers dispersal. Records from the south coast suggest that immigration from the continent does occur. Its main threats, however, are development, drainage, agriculture and peat extraction.
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