Synonyms and other taxonomic changes
Walsingham, 1888 (1)
Phylogenetic sequence #210017
Explanation of Names
Specific epithet is Latin meaning "polished" for the forewings that are "shining, pale greyish with a slight aeneous (coppery) tinge." (1)
Adult - uniformly brownish gray, irrorated with a sparse scattering of somewhat indistinct grayish white scales, sometimes so heavily as to impart a pale bronzy iridescence. Hindwing gray, usually darker than forewing and without pale, bronzy luster. (2)
Pupa - Dark brown to black. Vertex smoothly rounded. (2)
Egg - White, pyriform or oblong, molded by surrounding ovules, 0.35 x 0.2 mm. Chorion smooth. (2)
From southern British Columbia to California Channel Islands and southern Sierra Nevada. From the Pacific coast to Idaho and Colorado.
Flies from mid-March to early August.
Host plants have been recorded from the species listed below, all in the saxifrage family (Saxifragaceae):
Lithophragma affine, L. bolanderi, L. cymbalaria, L. heterophyllum, L. parviflorum, L. tenellum, and Heuchera grossulariifolia.
The female oviposits down into the ovary, and the larva feeds first on seeds and later after hibernation on vegetative parts (Pellmyr & Thompson, 1992).
The adult moth pollinates its host while the larvae feeds off the seeds. This relationship is similar to the well-known example of mutualism between yucca plants and yucca moths, Tegeticula
, also in the family Prodoxidae. For more details, see the article by Pellmyr & Thompson cited below under "Print References". (See also the "Remarks" on the Tegeticula info page
Pellmyr, O. & J.N. Thompson 1992. Multiple Occurrences of Mutualism in the Yucca Moth Lineage. Proc. Nat. Acad. Sci. 89(7): 2927-2929 (PDF
Davis, Pellmyr & Thompson (1992). Biology and systematics of Greya
Busck and Tetragma
, new genus (Lepidoptera: Prodoxidae). Smithsonian Contributions to Zoology
524: 1-74, Figs. 251-375. (2)
Walsingham, T. de Grey. 1888. Steps towards a revision of Chambers' index* with notes and descriptions of new species. Insect Life
Curated reference photo: Plate 1.29
(enlarged online version of reference photo from Powell & Opler(4)