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Pond olive dun - Cloeon dipterum
Pond olive dun - Cloeon dipterum

Pond olive dun
The pond olive dun (Cloeon dipterum), also called the small mayfly, of the order mayflies (Ephemeroptera), suborder split-back mayflies (Schistonota) and the superfamily Baetoidea belongs to the family of the Baetidae and to the genus Cloeon. This species is widespread from Europe to Siberia to East Asia (Japan). It is mainly found in Central Europe, but is also encountered on an occasional basis in Northern and Southern Europe. The Pond olive dun reproduces twice a year,the first in May / June, the second in August / September.
Cloeon dipterum
Cloeon dipterum
Adult specimens can reach body lengths of 5 to 9 mm. Including their long (and hairy) tail appendages total lengths of 8 to 17 mm are possible. Their long and slender bodies are yellowish-brown in colour sometimes with a green shimmer. The head is light coloured with a central marking in yellow, gray, brown and reddish-brown tones. Their two large compound eyes are brown in colour. Their mouth parts are atrophied because they mostly do not eat and live of fluid. The surface of the thorax is yellowish, reddish and whitish in colour and has a wide, somewhat darkened median stripe, in which a bright line runs lengthwise. The scutellum (small triangular plate on the thorax) is bright turquoise. Each segment of the abdomen has a light brown andreddish brown pattern on it and a long shiny green stripe lengthwise on the upper surface. In male specimens the posterior part is often red or reddish brown in colour. The Pond olive dun is able to swim by moving its abdomen up and down (making a wriggling motion). 7 pairs of gills are located laterally, the first six pairs of which work almost continuously. At the end of its abdomen it has 2 long and hairy (whitish and filamentary structured) tail appendages (Cerci), which are much longer than the entire body. The front wings are crystal clear (like glass) and have very noticeable dark veins. The rear wings are missing.
Pond olive dun - Rear view
Pond olive dun - Rear view
Cloeon dipterum live close to standing or slowly flowing, vegetation-rich waters and are found from May to August in the mountains as well as in the lowlands. Egg laying takes place in ponds, pools, puddles, canals and ditches. The larvae hatch immediately They feed on dead organic material and algae. At the end of the larval period the males of the new generation leave the banks and fly into forests, while the females remain close to the water.
The Pond olive dun is considered a bioindicator and due to the contribution of its larvae to water clarification it is of great ecological importance.

Description of images / photos
Photography with Cameras
Nikon D3x, Nikon D300, Canon 50D
Image editing with Photoshop
1. Pond olive dun - Cloeon dipterum
2. Cloeon dipterum
3. Pond olive dun - Rear view
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