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Species Hyalophora euryalus - Ceanothus Silkmoth - Hodges#7770
Classification Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Lepidoptera (Butterflies and Moths)
No Taxon (Moths)
Superfamily Bombycoidea
Family Saturniidae (Giant Silkworm and Royal Moths)
Subfamily Saturniinae (Silkmoths)
Tribe Attacini
Genus Hyalophora
Species euryalus (Ceanothus Silkmoth - Hodges#7770)
Synonyms and other taxonomic changes Samia rubra
Hyalophora "kasloensis" (recently ranked as a subspecies under euryalus) Explanation of Names EURYALUS: from the Greek "eurys" (broad) + the Latin "ala" (wing) Identification Adult: overall similarity to Columbia Silkmoth and Cecropia Moth except area beyond PM line maroon, purple, or pinkish, in a broad diffuse band; discal spot on hindwing shaped like an elongated comma pointing toward outer margin, sometimes breaking PM line.
This species is highly variable in color and pattern across its range (esp. when you factor in all three "subspecies" and seasonal/geographic color variants). Typically as described above; however, the discal spot (i.e. the elongated comma-shaped pattern often described as a "Nike Swoosh") may be reduced or even absent in extreme cases. Some individuals may be dark chocolate brown in appearance with strong grey suffusion submarginally (not typical, yet characteristic of more northern populations).
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Larva: changes colors as it develops and molts; mid instars are the most brilliantly colored with nine pairs of dorsal yellow spines, the first three pairs with partial to complete black rings; a middorsal yellow spine on A8; two rows of lateral blue spines tipped with white along T1-A8; white-tipped blue spines also occur on the head, at the base of the true legs, and in the anal region; body ranges from green to whitish-green
later instars whitish-green with white spines
[adapted from description by Jeffrey Miller] Range British Columbia to western Montana, south through west coast states to Baja California. In California, found mostly west of the Sierras. Habitat coastal areas, chaparral, intermontane valleys, conifer forests Season adults fly from January to July, depending on altitude, latitude, and seasonal variation
larvae in July and August Food Larvae feed on a number of trees and shrubs, including Red Alder ( Alnus rubra), birch, Antelope Bitterbrush ( Purshia tridentata), buckthorn ( Rhamnus), Buffaloberry ( Sheperdia canadensis), Ceanothus species, cherry, gooseberry ( Ribes), Hardhack ( Spiraea douglasii), hazel, Madrone ( Arbutus menziesii), manzanita ( Arctostaphylos), Mountain Mahogany ( Cercocarpus betuloides), Mountain Maple ( Acer glabrum), rose, Saskatoon Serviceberry ( Amelanchier alnifolia), willow ( Salix), and occasionally Douglas-fir ( Pseudotsuga menziesii). Life Cycle eggs laid singly or in clumps on leaves of host plant, hatching in 9-14 days; overwinters as a pupa in teardrop-shaped cocoon attached to twig on outer part of host plant Remarks The range of Hyalophora euryalus overlaps with H. "kasloensis", H. columbia (and its subspecies H. c. gloveri); hybridization often occurs where the various taxa meet.
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Currently, there are three recognized "subspecies" as follows:
Hyalophora euryalus "ssp. euryalus"
Pacific coast west of the Cascades and Sierras (incl. sw. BC, Canada; Pacific coast of the USA; ranging south into Baja Mexico/Pacific coast of c. Mex.)
NO IMAGE AVAILABLE
Hyalophora euryalus "ssp. cedrosensis"
RARE ENDEMIC of La Isla de Cedros, Baja Calif., Mexico
http://peabody.research.yale.edu/jls/pdfs/1990s/1993/1993-47(2)114-Smith.pdf
Hyalophora "kasloensis" (syn. H. euryalus "ssp. kasloensis")
A distinct "population group" of hybrid origin (euryalus X columbia group) with strong ties to the euryalus complex and currently recognized as a "subspecies" of euryalus. Isolated to a region east of the Cascades and west of the Rockies (incl. e. Washington, n. Idaho & w. Montana in the USA & sc. B.C. in Canada) See Also Columbia Silkmoth and its subspecies Hyalophora columbia gloveri has no maroon or purplish shading beyond PM line of wings, and the discal spots on its hindwing are not as elongated ( compare images of both species).
Cecropia Moth has more gray in the basal half of the wings, the reddish band beyond the PM line is narrow and sharply defined (not broad and diffuse), and the discal spots on its hindwing are not elongated ( compare images of both species).
List of similar taxa:
Print References Miller and Hammond, #235, p. 108 (1)
Tuskes et al., pp. 211-213, plates 28--adult, 6--larva, fig. 43--cocoon (2)
Powell and Hogue, p. 228, plate 11d--adult, 11e--larva (3)Internet References Butterflies and Moths of North America - adult and larva images, description, flight season, food plants, biology, habitat, references, US distribution map (Opler, Paul A., Harry Pavulaan, Ray E. Stanford, Michael Pogue, contributors)
Caterpillars of Pacific Northwest Forests and Woodlands - live larva image, description, food plants, seasonality (Jeffrey Miller; USGS)
live images of all life stages plus description and comments (Jeremy Tatum, Butterflies and Moths of Southern Vancouver Island)
live images of all life stages (Peter Bryant, Moths of Orange County, U. of California at Irvine)
live adult image plus description, food plants, biology, distribution (G.G. Anweiler, U. of Alberta)
food plants plus synonyms, links, references (Markku Savela, FUNET) Works Cited | 3. | California Insects
By Jerry A. Powell, Charles L. Hogue |  |
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