Giant pine coccids, giant pine scales, or marchalinids
Body large, up to 11 mm; usually yellow; legs large, dark; producing ventral, white ovisac; immature female forms similar in appearance to adult female; males known in 1 species, with winged and wingless forms; winged form with central tuft of filaments.
Placement of Marchalina is problematic. Morrison (1928) and Koteja (1974) considered it to be part of the Coelostomidiidae; but the work of Gullan and Sjaarda (2001) placed it basally in the Monophlebidae. For the purposes of this key, we consider Marchalinidae to be a family group distinct from other members of the margarodoids. Marchalinidae was first used as a family by Koteja (1996a).
Marchalinids occur in two zoogeographical regions, the Nearctic region and Palaearctic region. They are most speciose in the Palaearctic region.
Marchalinids are found on conifers in the genera Pinus, Abies, and Picea.
Marchalinids apparently have 4 instars in the female and 5 in the male. Marchalina caucasica Hadzibeyli has a generation every 2 years and lives at high altitudes in the conifer forests.