Treeton Dyke – Page 2 – Yorkshire Dragonfly Group

Four-spotted Chaser Libellula quadrimaculata

Posted on 22 April 1986 by Paul Ashton

Length

43mm, Wings 76mm

Males

Thorax brown, no antehumeral stripes; abdomen brown, last 4 segments darker than the rest, yellow spots on sides; wings dark patches at nodes on leading edges and at bases of rear wings.

Females

Similar to males, main difference is the shape of the anal appendages.

Habitat

Prefers sites of still water consisting of lakes, ponds, bog pools, canals and dykes. Will tolerate brackish conditions. The largest concentrations are associated with acidic ponds and pools.

Behavior

Males are territorial, their noisy clashes are obvious where densities are high. Readily returns to the same perch on emergent vegetation, after sparring with other males, or after short patrols along the waters edge. Copulation is short taking place in flight, only lasting for 5-20 seconds. Female oviposits by flicking the abdomen tip downwards into the water. The eggs then sink and adhere to submerged vegetation. Males may stay close by to guard females during oviposition. Larvae live among the bottom debris, then emerge after two to four years. Emergence takes place amongst marginal vegetation during daylight hours.

Flight Period

Distribution Map

Locations

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Black-tailed Skimmer Orthetrum cancellatum

Posted on 22 April 1983 by Paul Ashton

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Length

50mm, Wings 78mm

Males

Thorax black, no antehumeral stripes; Abdomen top is blue with yellow spots towards sides, black tip; legs black.

Females

All yellow with 2 black bands on upper surface abdomen.

Habitat

Prefers lakes, ponds, gravel workings, slow rivers or marshes, with exposed mud, stones or bare patches where the male can perch.

Behavior

Highly territorial, males perch on bare areas of ground, typically on slightly raised areas such as stones, logs or bare soil, on the lookout for females and rival males. When patrolling over water they fly low, skimming over the surface. Copulation can take place in flight, where it will only last for a few seconds, though sometimes this can take place in vegetation where it may last up to 15 minutes. Oviposition occurs by dipping the abdomen into water, with the male often remaining nearby. Larvae live amongst the bottom silts, emerging after two to three years. Emergence usually takes place on vegetation, often several metres away from water.

Flight Period

Distribution Map

Locations

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Common Darter Sympetrum striolatum

Posted on 22 April 1981 by Paul Ashton

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Length

37mm, Wings 57mm.

Males

Thorax brown with yellow patches on sides; abdomen orange/red with black central line last 2 segments ; legs black/yellow; eyes brownish; black line on top of the frons only.

Females

Thorax pale brown with yellow side panels; abdomen yellow with black central line segments 9-10 and along sides. Old females tend to take on male colours.

Habitat

Preferences are quite catholic, including ponds, lakes, canals, ditches and slow-flowing rivers. It is tolerant of brackish conditions and peaty bog pools. Can be found away from breeding sites feeding in sheltered locations, like woodland rides and hedgerows.

Behavior

Males are territorial, spending a lot of time perched, only making short flights when disturbed or chasing off intruders. Basks on the ground, especially late in the season when temperatures are lower. Frequently found away from water in sheltered areas, especially females wanting to avoid attention from males. Copulation takes place at rest, lasting around 10-15 minutes. Oviposition regularly takes place in tandem, where the eggs are flicked into the water by dipping the abdomen onto the surface. Females will also oviposit alone. Larvae emerge after one year, this taking place during the morning, onto bare bank sides or emergent vegetation.

Flight Period

Distribution Map

Locations

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Red-veined Darter Sympetrum fonscolombii

Posted on 22 April 1980 by Paul Ashton

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Length

40mm, Wings 63mm

Male

Male Red-veined Darter at Hornsea Mere on 02/07/2009. - © Paul Ashton.

Brick red colour with central black line on segments 8 and 9; basal veins of wings near leading edges are red with a yellow patch at the base of the hind wing; underside of eyes are blue.

Females

Body yellow with central black line on segments 8 and 9; yellow patch at base of hind wings and veins at front edge of wings also yellow; underside of eyes blue.

Habitat

Vagrant from Europe, although it has colonized some areas of Great Britain. In the East Riding the best site is the scrape in Clubley’s field at Spurn Point. Shallow ponds, pools and ditches.

Behavoiur

Males are territorial, perching on the ground or adjacent vegetation, only flying off to intercept intruders. Frequently hovers over open water. The pair usually oviposit in tandem in areas of shallow water. The warmer water in shallow conditions helps the larvae develop quickly, sometimes resulting in a second generation emerging in the same year. They are strongly migratory, with strong influxes in some years, then none in others. These irregular influxes make it difficult to assess if this species is breeding on a regular basis.

Flight Period

Distribution Map

Locations

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Ruddy Darter Sympetrum sanguineum

Posted on 22 April 1978 by Paul Ashton

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Length

34mm, Wings 55mm.

Males

Thorax brown with 2 thin black lines on sides; abdomen narrow waist, rich red colour; face red; legs all black; line over frons spreads down the sides.

Females

Yellowish throughout with black markings on sides of thorax and abdomen; legs all black.

Habitat

Marshes, ponds, lakes, canals and ditches, with plenty of tall emergent vegetation. Will tolerate brackish conditions, using woodland near to water bodies for shelter.

Behavior

Males are less aggressively territorial than Common Darter Sympetrum striolatum. They have a ‘skippy’ flight, being less direct than the latter species. Copulation lasts only a few minutes whilst perched on vegetation or the ground. The female will then oviposit either alone, or in tandem, amongst shaded vegetation. Larvae live among submerged plants and emerge after one year.

Flight Period

Distribution Map

Locations

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