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Species Orthonama obstipata - The Gem - Hodges#7414

The Gem Moth - Orthonama obstipata 2312 Orthonama obstipata - The Gem 7414 - Orthonama obstipata 2011 Sandy Hook Bioblitz Moth #13 - Orthonama obstipata - male Gem? - Orthonama obstipata - female The Gem - Orthonama obstipata the gem - Orthonama obstipata - female The Gem Hodges # 7414 - Orthonama obstipata - female The Gem - Hodges#7414 - Orthonama obstipata - female
Show images of: caterpillars · adults · both
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
Superfamily Geometroidea (Geometrid and Swallowtail Moths)
Family Geometridae (Geometrid Moths)
Subfamily Larentiinae
Tribe Xanthorhoini
Genus Orthonama
Species obstipata (The Gem - Hodges#7414)
Hodges Number
Other Common Names
Gem Moth
Synonyms and other taxonomic changes
Orthonama obstipata (Fabricius, 1794)
Heppner (2003) listed many of synonyms (due to world-wide range). (1)
There are two species of the genus Orthonama in America north of Mexico. (2), (3)
Wingspan 15-22 mm.
Adult is sexually dimorphic:
Female forewing is dark brown/maroon with a small white ring near the middle of the disc;
Male forewing is light brown/yellowish with a black spot in place of the female's white ring;
Both sexes have oblique blackish dash at apex of forewing (which distinguishes The Gem from the Bent-line Carpet)

          female                          male
Orthonama obstipata occurs in most of North America, and is found worldwide. Populations die out in colder temperate areas over the winter, but these areas are recolonized frequently from warmer areas (4), (5), (6), (7), (8), (9), (10), (11), (12)
This species flies practically throughout the year on Block Island, RI, and is common on wing throughout the warm months.(13)
The larvae feed on a variety of herbaceous plants, such as Chrysanthemum, Dock (Rumex), Knotweed (Polygonum), Packera aurea (L.) A. Love & D. Love (golden ragwort).
A strong flier, this species is known to cross long distances of open sea.
See Also
Bent-line Carpet (Costaconvexa centrostrigaria) lacks an oblique blackish dash at apex of forewing.
Print References
Covell, C., 2005. Field Guide to Moths of Eastern North America. Virginia Museum of Natural History. p. 385, plate 49. (4)
Powell, J.A. & P.A. Opler, 2009. Moths of Western North America. University of California Press, plate 33, fig. 4; p. 227. (14)