Adult females of Micrococcus species are pink or red and are broadly oval when mature. They generally feed on the roots of grasses and often are in Tapinoma ants nest. Males are wingless. Adult females of Molluscococcus fibrillae Hall are peculiar in that they appear like a bivalved mollusc. A deep depression is formed in the body of the female around the rootlet of the host grass.
Placement of species of. Molluscococcus and Micrococcus have always been difficult. They have been treated as a separate family (Micrococcidae), and as members of the Coccidae, Eriococcidae, and Pseudococcidae. Micrococcidae Silvestri was first used as a family by Koteja (1974).
Micrococcids occur in the Mediterranean area and Zimbabwe (the Afrotropical region and the Palaearctic region) They are most speciose in the Palaearctic region.
Micrococcids are found only on the roots of grasses (with one apparently incidental record from Rubus).
Micrococcids have 4 instars in the female and apparently 5 in the male. They have a single generation each year and aestivate as first instars, at least in Micrococcus bodenheimeri Bytinskii-Salz. Development occurs during the winter when grass seed begins to germinate. Egg-laying females occur up to the end of March or the beginning of April in Israel.