Malpighian tubule

English Etymology From Marcello Malpighi (1628-1694). Noun A tubule that extends from the alimentary canal to the exterior of the organism, excreting water and wastes in the form of solid nitrogenous compounds. Found in certain insects, arachnids, myriapods and tardigrades. en November 28, 1997 Elizabeth Pennisi CELL BIOLOGY: Multiple Clocks Keep Time in Fruit Fly Tissues Science http://www.sciencemag.org/cgi/content/full/278/5343/1560 10.1126/science.278.5343.1560 278 5343 1560–1561 The fruit fly's malpighian tubules, which act like a kidney, have a daily rhythm, evidenced by cyclical expression of per and another clock gene called tim. See also en eponyms