Pond life. Composite image of a darkfield light micrograph of pond life behind an image of a light microscope. From left to right are a gastrotrich, a Paramecium caudatum ciliate, a Cephalodella sp. rotifer, an Oxytricha sp. ciliate reproducing via binary fission and a water flea (Daphnia sp.). Strands of filamentous algae cross the image. Various algae (Pediastrum sp., Nitzschia sp. and Spirotaenia sp.) are distributed over the image. Components are not shown to scale.