Stone Flies

Stone Flies

 

insects of the order Plecoptera. Their wings are transparent, are folded flat on the back when at rest, and have a spread of from 10 to 80 mm. At the end of the body there are two long cerci. There are about 700 species, which live near flowing bodies of water. Stone flies are particularly diverse and numerous in mountainous regions. The widely distributed species Isogenus nubecula is characteristic of the large lowland rivers of Europe. The larvae, which have two cerci, are carnivorous and live on the bottom, staying among stones. The larvae prefer clean, oxygen-rich, cold water. Metamorphosis is incomplete. Their development is slow, continuing in certain species (for instance, Perla abdominalis) for more than three years. The exit of grown nymphs from the water and the emergence of grown insects begins in early spring. Stone fly larvae serve as food for commercial fish.

References in periodicals archive ?
In many smaller streams, Stone flies are found in good numbers.
The intriguing fact about this stone (there are two) is that if 11 people touch their finger to the stone and shout Qamar Ali Darvesh's name, the stone flies in the air.
The car also has an anti-lock braking system that helps during panic braking and windows are laminated to prevent the glass from shattering if a stone flies off the road in your direction.
In summer they can be lined up almost elbow-to-elbow here, casting golden stone flies and grasshoppers onto the riffled water, teasing brown trout and redband rainbows onto their barbless hooks.
The mammals, which can live to be as old as 14, feed on swarms of insects at night, including mosquitoes, moths, mayflies, and stone flies.
And until he saw the stone flies skimming along the water, he couldn't quite figure out how gilled creatures made the transition to an airborne existence.
Entomologists consider stone flies and another aquatic insect, the mayfly, to be primitive relics that, like horseshoe crabs, have changed very little over millions of years.
Thus, stone flies have acquired not only the wings, but also the muscles, patterns of movement, and articulations needed for flight, marden notes.
Marden and Kramer clipped the wings of some stone flies of the species Taeniopteryx burksi, videotaping individuals before and after clipping to assess skimming speed relative to wing size and to the ratio of flight-muscle mass to body size.
The researchers also noticed that in the warm laboratory, 31 stone flies tried to fly.
Invertebrates are little creatures such as freshwater shrimps, mayflies, stone flies and caddis that live on the river bed amongst the gravel, stones and plants.
High above the creek, mayflies that anglers call blue-winged olives and pale morning duns bob up and down in the still air; fluttering down along the banks are sulfur-tinted golden stone flies.