Word: larval
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Dates: during 1940-1949
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...larval period (which lasts through the winter) and in spring when the pupa has emerged from the cocoon, no urinary wastes are excreted. Instead, embryonic mud daubers produce uric acid pellets which are stored in an organ called the "fat body." Only after the adult wasp has started to eat its way out of its mud cell are the uric acid pellets excreted...
...caused by a tiny blood fluke which burrows under the skin of river bathers, causes fever, hives, bladder infection, sometimes cirrhosis of the liver. The parasite has a complicated life cycle: its eggs, hatching in warm water, develop larvae which enter snails, there develop to a second, man-attacking larval stage called cercariae or flukes. A single snail may produce 32,000 flukes...
Country Visitors. By far the most damaging insect, and most at home in modern civilization, is the clothes moth. It has been known to eat house insulation as well as clothes, rugs, etc. (it is destructive in the larval stage only). Best weapons against the moth are sunlight, moth balls or flakes, paradichlorobenzene. Chemists have recently developed effective new methods for permanent mothproofing of wool - for postwar...
...origin of these non-sexual castes has long been debated by entomologists. Some claim they are born of different sorts of eggs. Others claim that all ants are equal when they hatch into the larval state and only during their further development acquire caste with its distinctive form, physiology and behavior. But, if so, how? Here, too, the scientists propose confusing answers...