Oidaematophorus phaceliae is a moth of the family Pterophoridae that is found from Yukon to Ontario, south to California and Baja California.Neotropical species of the family Pterophoridae, part II. Zool. Med. Leiden 85 (2011) The habitat consists of boreal forest.
The wingspan is about . The forewings are deep fawn-brown, heavily sprinkled with white and smoky scaling. The hindwings are smoky brown with pale smoky fringes. Females are somewhat more heavily marked than males.Notes On Certain Of Walsingham's Species Of Oidaematophorus With Descriptions Of New Species (Pterophoridae) by J. Mcdunnough, The Canadian Entomologist, 1938, 70
The larvae feed on Hydrophyllaceae species, including Phacelia species and Hydrophyllum virginianum. Full-grown larvae are long and olive-green, with a clearly defined narrow longitudinal middorsal yellowish-white line, margined with grey and a light green head. Pupation occurs on the surface of dead leaves of the food plant. The pupa turns dark before eclosion.The Early Stages of Oidaematophorus phaceliae McD. (Lepidoptera: Pterophoridae) by John Adams Comstock, The Canadian Entomologist, 1964, 96
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