The Margarodidae (illegitimately as Margodidae) or ground pearls (cottony cushion scales, giant coccids, giant scale insects) are a family of scale insects within the superfamily Coccoidea. Members of the family include the Polish cochineal and Armenian cochineal (genus Porphyrophora) and the original ground pearl genus, Margarodes. Beginning in 1880, a number of distinct subfamilies were recognized, with the giant coccis (the Monophlebidae) being the first. Although Maskell proposed a new family, many continued to regard the monophlebids as a mere subfamily for many years, and the Margarodidae classification continued to be polyphyletic through the 20th Century. Since then, taking the advice of Koteja several subfamilies and tribes have been elevated into their own families such as Matsucoccidae and Xylococcidae. The pared-down family of Margarodidae (Margarodidae sensu stricto or Margarodidae s. s.) is monophyletic.
^Vahedi, Hassan‐Ali, and Hodgson, C. J. (2007). "Some species of the hypogeal scale insect Porphyrophora Brandt (Hemiptera: Sternorrhyncha: Coccoidea: Margarodidae) from Europe, the Middle East and North Africa". Systematics and Biodiversity. 5 (1): 23–122. doi:10.1017/S1477200006002039.CS1 maint: Multiple names: authors list (link)
^Maskell recognized the Monophlebidae as a separate family that year, Maskell, W. M. (1880). "Further notes on New Zealand Coccidae". Transactions and Proceedings of the New Zealand Institute. 12: 291–301.
^ abGullan, P. J. & Sjaarda, A. W. (2001). "Trans‐Tasman Platycoelostoma Morrison (Hemiptera: Coccoidea: Margarodidae) on endemic Cupressaceae, and the phylogenetic history of margarodids". Systematic Entomology. 26 (3): 257–278. doi:10.1046/j.1365-3113.2001.00145.x.
^Jakubski, Antoni Władysław (1965). A Critical Revision of the Families Margarodidae and Termitococcidae (Hemiptera, Coccidoidea). London: Trustees of the British Museum, Natural History.
^Koteja, J. (1974). "On the phylogeny and classification of the scale insects (Homoptera, Coccinea) (discussion based on the morphology of the mouthparts)". Acta Zoologica Cracoviensia. 19: 267–325.
^Hodgson, Chris J. & Hardy, Nate B. (2013). "The phylogeny of the superfamily Coccoidea (Hemiptera: Sternorrhyncha) based on the morphology of extant and extinct macropterous males". Systematic Entomology. 38 (4): 794–804. doi:10.1111/syen.12030.