[4] Many Parasitengona are relatively large (for mite standards) and have a bright red colouration.

[3] Other colours include purple, orange, yellow, blue, green and brown.

In Trombidia, there is usually one or two pairs of trichobothria on the prodorsum, and these are often mounted on a linear sclerotised plate (crista metopica).

[6] Eggs of Trombidia are usually reddish, but those within superfamily Erythraeoidea are brown-black due to a lipid-protein cover.

[3] The life cycle of Parasitengona consists of the egg, prelarva, larva, protonymph (also known as the nymphochrysalis), deutonymph, tritonymph (imagochrysalis) and adult.

[5] Deutonymphs and adults are usually predators on other arthropods, especially immobile life stages such as eggs and pupae.