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Widow skimmers have large bulky bodies, with large heads. Adults have a steely blue body area but juveniles are yellow with brown stripes. [2] Eyes are also large and close together meeting in the middle of the head. [3] They have three pairs of legs. Legs are black in color. They have two pairs of wings: forewings and hindwings.
Palpopleura sexmaculata, [2] commonly known as the Asian widow or blue-tailed yellow skimmer, [3] [4] is a species of dragonfly in the family Libellulidae. It is widespread in several countries in South , East and Southeast Asia , but is no longer believed to occur in Sri Lanka .
The chasers, darters, skimmers, and perchers and their relatives form the Libellulidae, the largest family of dragonflies. [2] It is sometimes considered to contain the Corduliidae as the subfamily Corduliinae and the Macromiidae as the subfamily Macromiinae. Even if these are excluded (as Silsby does), there remains a family of over 1000 species.
Bittern is commonly formed in salt ponds where the evaporation of water prompts the precipitation of halite. These salt ponds can be part of a salt-producing industrial facility, or they can be used as a waste storage location for brines produced in desalination processes. [3] Bittern is a source of many useful salts.
The black skimmer has an additional adaptation and is the only species of bird known to have slit-shaped pupils. [ 4 ] the forehead, ends of the secondaries, tail feathers and under parts are white, the rest of the plumage is black and the basal half of the bill is crimson. [ 5 ]
Pantala flavescens, [3] the globe skimmer, globe wanderer or wandering glider, [1] is a wide-ranging dragonfly of the family Libellulidae. [1] This species and Pantala hymenaea , the "spot-winged glider", are the only members of the genus Pantala .
Males have a red face, while females have a brown or yellow face. [8]This species can be separated from the very similar Libellula auripennis by the following: . their posterior (rear) wing veins do not become orange [8]
The keeled skimmer is common in central and southern Europe, marginally entering into Russia, [3] and in North Africa.It is locally common in western Britain and Ireland.