Platphalonidia, has been synonymized with Phalonidia by Razowski, 2011 : "Remarks: Platphalonidia was described for Phalonia felix Walsingham, 1895 and over 10 other species from the New World. Unfortunately the type-species belongs to Phalonidia and differs from the remaining New World species."
Only felix was officially moved. The rest were moved to Platphalonia by Metzler & Albu, 2013. As of 8/18/2015 Tortricid.net has those other species placed in Phalonidia but will be updated at some point in the near future.
Razowski, 1985. On the generic groups Saphenista and Cochylis (Tortricidae). Nota lepidopterologica.
Metzler, E.H. & Albu, V., 2013: The description fo Platphalonia (Tortricidae, Tortricinae, Euliini, Cochylina) found nectaring diurnally on Centromada pungens (Asteraceae) in the Central Valley of California along with a list of species of Platphalonia. Journal of the Lepidopterists’ Society
Metzler, E.H. & Brown, J.W., 2014: An updated check list of the Cochylina (Tortricidae, Tortricinae, Euliini) of America north of Mexico including Greenland, with comments on classification and identification. Journal of the Lepidopterists’ Society
68(4): 274–282 (1)
Razowski, J., 2011. Diagnoses and Remarks on Genera of Tortricidae, 2: Cochylini (Lepidoptera: Tortricidae). SHILAP Revista de Lepidopterología