Fruit fly, SEM
Fruit fly. Coloured scanning electron micrograph (SEM) of a fruit fly (Drosophila funebris) on an apple. Its compound eyes (red) are seen and its wings are outstretched. Fruit flies are widely used in genetic experiments, particularly in mutation experiments, because they reproduce rapidly and their genetic systems are well understood. Magnification: x20 when printed at 10 centimetres wide.
© POWER AND SYRED/SCIENCE PHOTO LIBRARY
Stalk-eyed fly, SEM
Stalk-eyed fly. Coloured scanning electron micrograph (SEM) of the head of a stalk-eyed fly (family Diopsidae). Stalk-eyed flies are mostly tropical insects, with one species being found in North America. The length of the stalks that their eyes are on varies and can be as long as their bodies. Although having their eyes on stalks allows a greater range of vision, it also poses an aerodynamic handicap. Magnification: x40 when printed at 10 centimetres wide.
© CLOUDS HILL IMAGING LTD/SCIENCE PHOTO LIBRARY
Blowfly laying eggs, SEM
Blowfly laying eggs. Coloured scanning electron micrograph (SEM) of a female Lucilia sp. blowfly laying her eggs (lower left). A blowfly lays its eggs on dead bodies. This behaviour is studied by forensic entomologists. A blowfly detects a dead body by the odour of decomposition, and can arrive at a corpse minutes after death and lay up to 300 eggs. The decaying flesh is food for the maggots (fly larvae) that hatch from the eggs within 24 hours. These two-millimetre-long eggs are laid in patches around moist orifices such as the nose, ears and eyes, as well as open wounds. Fresh and unhatched blowfly eggs will indicate a very recent time of death. Magnification unknown.
© VOLKER STEGER/SCIENCE PHOTO LIBRARY