The events of meiosis I in a living insect spermatocyte beginning at diakinesis through telophase to the near completion of cytokinesis. Testes from the Crane fly Nephrotoma suturalis were observed with time-lapse polarization using a Nikon Microphot SA, equipped for liquid crystal polarized light microscopy (LC-PolScope, CRi, Woburn Massachusetts) 60x/1.4 PlanApo oil immersion objective, 1.4 NA oil imm. condenser, with 1.5x zoom lens. Image acquisition and processing Camera: Images captured every 30 sec over 4 hr by a Dage-MTI C300 video camera with Scion AG-5 frame grabber. Raw images were processed using 4-frame algorithm (Shribak and Oldenbourg, 2003). Movie images represent computed retardance as gray values ranging from 0 nm retardance (black) to 2 nm retardance or higher (white).