Body broadly oval or pyriform; flat in cross section; body reddish, dark brown in older females; often with sclerotized areas around body margin; anal plates located in middle of dorsum; without an obvious wax covering; ovisac represented by narrow white secretion around body margin. Occurring on leaves and stems; adult females usually on undersides of leaves, immatures often on upper surfaces. Males apparently absent. Eggs laid beneath body of the female, creamy white when laid, turning red.
Protopulinaria longivalvata is similar to P. pyriformis by having the anal plates in the center of the body and the anterolateral margin of the anal plates conspicuously longer than the posterolateral margin. Protopulvinaria longivalvata differs by having smaller and less divided marginal setae (large and conspicuously divided in P. pyriformis), shorter and less conspicuous dorsal setae (long and conspicuous in P. pyriformis), and usually 8 or fewer submarginal tubercles (usually 10 or more in P. pyriformis).
U.S. quarantine notes
This species was intercepted 95 times at U. S. ports-of-entry between 1995 and 2012, with specimens originating from Argentina, Barbados, Belgium, Brazil, Colombia, Costa Rica, Dominica, Dominican Republic, Grenada, Guatemala, Hawaii, Jamaica, Peru, Puerto Rico, Suriname, Thailand, Trinidad and Tobago, The U.S. Virgin Islands, and Vietnam. We also have examined quarantine material from Barbados (Ixora), Belize (Anthurium, Ixora), Brazil (Ixora), Colombia (Dieffenbachia), Costa Rica (Dracaena, Gardenia, Heliconia), Grenada (Myristica), Guatemala (Schefflera, Malus), Honduras (Gardenia), Jamaica (Cinnamomum, Peperomia), Mexico (Chamaedorea, Gardenia), Panama (Antidesma), The Philippines (Ficus, Lansium), Puerto Rico (Acerola, Gardenia, Malpighia, Piper, Psidium), Tahiti (Gardenia, Jasminum), Thailand (Piper), Trinidad (Codiaeum, Gardenia, Ixora), Venezuela (Cattleya, Gardenia). ScaleNet includes hosts in 13 plant families from all zoogeographic regions except the Nearctic and Palaearctic regions. One other species of Protopulvinaria other than P. longivalvata and P. pyriformis Cockerell has been taken at U. S. ports-of-entry, P. fukayai (Kuwana) (Japan, on Fatsia).