Overview

Distribution

Range Description

Orthetrum cancellatum is a widespread European species which occurs eastwards over central Asia (Baijal and Agarwal 1955, Calvert 1898, Dasgupta 1957, Fraser 1918, 1936; Kumar 1982, Kumar and Prasad 1981, Mitra 2002, Singh et al. 1955) to the northern parts of China and Arunachal Pradesh in India (Mitra 2002). It is found throughout European continent (Benken 1980, Buczynski and Pakulnicka 2000, Fraser 1918, 1936; Huber 2000, Kormann 1966, Ris 1909, Tsuda 1991) including the Mediterranean islands (Fraser 1936) but is absent in the north of Britain and the northern half of Fennoscandia.
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
The species is found in largely unshaded standing or slow-flowing waters.

Systems
  • Terrestrial
  • Freshwater
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Orthetrum cancellatum

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2010

Assessor/s
Mitra, A.

Reviewer/s
Dow, R.A., Clausnitzer, V., Brooks, E., Kakkasery, F., Babu, R. & Mondal, S.

Contributor/s

Justification
Orthetrum cancellatum is common and widespread across Europe and Asia and is not under any specific threat. Therefore, the species is listed as Least Concern.
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Population

Population
This is one of the most common European species. It frequently occurs in large populations.

Population Trend
Stable
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Threats

Major Threats
No information is available on any existing threat.
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Management

Conservation Actions

Conservation Actions
No specific actions are needed.
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Wikipedia

Black-tailed skimmer

The black-tailed skimmer, Orthetrum cancellatum, is a dragonfly of Europe and Asia. It occurs nearly all of Europe except northern UK and Scandinavia; to the east, the range extends to Kashmir and Mongolia.

The adult male has a blue abdomen with a black tip and transparent wings, and the female has a yellow (later: brown) body with black bands along the abdomen and transparent wings. Even the immature males look that way.

This species has expanded its range, assisted by the creation of gravel pits which give it the extensive open unvegetated areas it prefers. It was first recorded in Great Britain in Essex in 1934. It is decreasing rapidly in the Maltese Islands.

Description[edit]

The black-tailed skimmer is a fairly large dragonfly (the length of 44–50 mm, 29–35 mm abdomen, rear wing 35–41 mm.) with relatively broad, flattened abdomen, but not as broad as to chaser species. With age, adult males develop extensive blue pruinescence on their abdomen, offset by yellow lateral patches. The middle lobe of the pronotum is large and notched in the middle. The chest is yellow or yellowish-brown. The abdomen is more or less flattened. The base of the hind wings without a dark opaque spots. The pterostigma is dark brown or black. On the front wings pterostigma 2–3 mm long. Anal appendages black. The females and immature males are a deep yellow color, with wavy black lines dorsally on their abdomen. Males and females have the costal vein (the leading edge of the wing) yellow or black.[1]

The species is similar to its much more localized congener the White-Tailed Skimmer, but readily identifiable in the field. The males develop a blue pruinescence on the abdomen darkening to the rear with S8-10 becoming black. Its eyes are very dark green. They fly swift and low, skimming the water surface.Females retain their color and markings though they become quite grayish brown with age.This species could be confused with Keeled skimmer or Scarce chaser.

Adults[edit]

Adults about 47–53 mm long. Average wingspan is about 77 mm; hindwings 35–40 mm long.The eyes dorsally narrowly apposed to dorsally broadly contiguous; brown (in the female), or blue (in the male).Legs black and brown (the femoral bases brown). Thoracic antehumeral stripes absent. The wings spread more or less horizontally in repose; dissimilar in shape and venation; sessile; unpatterned and clear. The inner wing venation blackish. Discoidal cell divided longitudinally into a conspicuous triangle and supra-triangle. Antenodal veins in the forewings 10–13 (fewer in the hindwings).[2] Pterostigma well over twice but no more than five times as long as wide.Abdomen lanceolate 30–35 mm long; predominantly blue (in the male), or brown (in the female), or grey (sometimes, in old females); rather plain (in the male, but often with orange lateral markings, and darkened over the terminal segments), or predominantly longitudinally lined (the female with a dark medio-lateral band on either side along each segment); without mid-dorsal spots.[3] The male abdomen without auricles on segment 2; with a single inferior anal appendage. ♂: Adults have a bluish or blue-gray patina on the body, gradually darkening with age. The young have a grid pattern on a yellow-brownish abdomen. ♀: Yellow-brownish abdomen with a lattice pattern (wide longitudinal dark brown stripes and bright crescent-shaped spots). 10 tergite of abdomen black.

Nymphs[edit]

The nymphs are stout, body is expanded in the middle. When mature,they are 23–25.5 mm long.The postocular lobes curving sharply to the back of the head from some distance behind the eyes. The antennae 7 segmented.[4] The mask having the prementum hollowed dorsally. The prementum bearing three (rarely two or four) long setae inserted near each lateral margin, and two medial fields of seven to eight short spiniform setae, the latter flanked by four setae of medium length. The body of the labial palps bearing 6 or 7 major setae. Distal margins of the labial palps weakly crenate. Legs longer than the abdomen.The abdomen terminating in five short spine-like appendages. The cerci no more than half the length of the paraprocts. The abdomen with mid-dorsal spines. The mid-dorsal abdominal spines prominent on segments 3 to 6. The abdomen without a mid-dorsal spine on segment 8; gizzard with 4–8 folds.[5]

Mating[edit]

mating wheel

Oviposition site and behavior: females oviposits alone but with male in attendance. Eggs are laid in flight by dipping abdomen onto water surface.[6] They hatch after five or six weeks and the larvae live partially hidden by bottom debris. They emerge after two or three years.Larvae prefer bottom areas rich in vegetation and decaying plant material. The main flight period is June and July.[7] Males characteristically perch horizontally on exposed surfaces. They fly swift and low, skimming the water surface, while defending their territories. Mating can occur in flight or on land.[8]

Distribution[edit]

Fairly common. Orthetrum cancellatum is a widespread European species which occurs eastwards over central Asia to the northern parts of China and Arunachal Pradesh in India. It is found throughout European continent including the Mediterranean islands but is absent in the north of Britain. This is one of the most common European species.This specie is still increasing its range northwards.

It is native in Albania; Austria; Azerbaijan; Belarus; Belgium; Bosnia and Herzegovina; Bulgaria; China; Croatia; Cyprus; Czech Republic; Denmark; Estonia; Finland; France (Corsica, and mainland); Georgia; Germany; Greece; Hungary; India; Ireland; Italy ; Kazakhstan; Kyrgyzstan; Latvia ; Lithuania; Luxembourg; Macedonia, Malta; Moldova; Mongolia; Montenegro; Netherlands; Norway; Poland; Portugal; Romania; Russian Federation; Serbia ; Slovakia; Slovenia; Spain; Sweden; Switzerland; Tajikistan; Turkey (Turkey-in-Europe); Turkmenistan; Ukraine; in part of United Kingdom;[9] Uzbekistan.

The black-tailed skimmer is abundant throughout its range and is one of the most commonly seen dragonflies in Europe. It holds a stable population and has no known major threats.[10]

Habitat[edit]

This dragonfly is found at any open water with bare patches along the shore where the patrolling males frequently rest in the sun. Also near slow-flowing waters. Favors lakes, slow rivers, ponds and sometimes marshy area, without dense riparian vegetation.[11] Females are less bold and not encountered as regularly. Adults prefer to perch on bare ground and rocks . Dragonflies often sits down to rest directly on the ground.

References[edit]

  1. ^ "Black-Tailed Skimmer (Orthetrum cancellatum)". Retrieved 2 January 2015. 
  2. ^ M. J. Dallwitz; L. Watson. "British Insects: the Odonata". http://delta-intkey.com/britin/odo/www/cancella.htm. 
  3. ^ "Orthetrum cancellatum – Black-tailed Skimmer". Retrieved 2 January 2015. 
  4. ^ "Стрекозы Беларуси (Odonata of Belarus)". http://odonata.weebly.com/orthetrum-cancellatum.html. 
  5. ^ Dolbear, Ken. "Keeled Skimmer - Orthetrum coerulescens". Retrieved 21 January 2015. 
  6. ^ "Black tailed Skimmer". Retrieved 2 January 2015. 
  7. ^ "Black-tailed Skimmer (Orthetrum cancellatum)". 
  8. ^ Wylde, Claire. "Exuviae and the enchanted world of the dragonfly". http://www.wildlifebcn.org/blog/clairewylde/2013/07/10/exuviae-and-enchanted-world-dragonfly. Retrieved 21 January 2015. 
  9. ^ Black-tailed Skimmer (Orthetrum cancellatum). http://www.brocross.com/dfly/species/cancel.htm. Retrieved 2 January 2015.  Missing or empty |title= (help)
  10. ^ "Black Tailed Skimmer". http://www.norfolkdragons.co.uk/species/cancellatum.shtml. 
  11. ^ "Lielā ezerspāre". Retrieved 2 January 2015. 
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