26.3 MB (1.6 MB compressed)
3700 x 2480 pixels
31.2 x 21.1 cm ⏐ 12.3 x 8.3 in (300dpi)
MARTIN DOHRN / SCIENCE PHOTO LIBRARY MARTIN DOHRN / SCIENCE PHOTO LIBRARY
Emergence of an adult, male northern house mosquito, Culex pipiens, from its pupal case below a water surface. Mosquito larvae hatch on the water suface from clumps of eggs laid in the spring; although heavier than water, the larvae are able to remain suspended from surface through surface tension effects on a ring of hairs that surrounds the opening to the trachea (airway). Pupation occurs after 4 larval molts over a three week period. The imago (young adult) emerges after a few days, with its pupal case acting as a buoyancy platform before splitting. Air filling the foregut serves to force the imago out of its split case.
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