There are multiple metric units to choose from! This tutorial goes through the process of choosing the best metric unit to use for measuring the mass of a given object.
The most common aphids on houseplants are the light green ones (pear aphids), but aphids can also be found colored pink, white, grey and black. Additionally, winged aphids can appear when colonies are established and fly to infect new plants. Juvenile aphids (nymphs) look like smaller versions of the adults.
antlion or antlion fly, aphid or plant louse, aphis, apple blight or American blight, bee fly, beetfly or mangold fly, blackfly or bean aphid, blowfly or bluebottle, botfly, buffalo gnat or black fly, bulb fly, bushfly, carrot fly, chalcid or chalcid fly, cluster fly, crane fly or (Brit.) daddy-longlegs, damselfly, dobsonfly, dragonfly or (colloquial) devil's darning-needle, drosophila, fruit fly, or vinegar fly, fly, frit fly, fruit fly, gadfly, gallfly, gnat, grannom, greenbottle, greenfly ...