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Species Page - Hyalophora euryalus
Hyalophora euryalus ->species page

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scientific name    Hyalophora euryalus    

common name     Ceanothus Silkmoth

There are no known native populations in AB. See remarks under "Range".

This species can be recognized by the pinkish maroon colour that prevails beyond the postmedian white band. In H. columbia gloveri, this outer third of the wing has very little or no trace of maroon. Although variable, the discal spots are usually greatly elongated towards the outer edge of the wing, and this trait distinguishes euryalus from the other species of Hyalophora. The range of euryalus is not known to overlap with any other Hyalophora in Canada.

life history
Overwintering cocoons of H. euryalus are attached to the larval host plant and occasionally other plants.

Not applicable for Alberta.

diet info
Larvae are reported to feed on a variety of shrubs including Red Alder (Alnus rubra) (which occurs only along the west coast of BC), willow, wild rose, Currants and gooseberries (Ribes spp.), buffaloberry (Sheperdia canadensis), Mountain Maple (Acer glabrum), Saskatoon (Amelanchier alnifolia), and Redstem Ceanothus (Ceanothus sanguineus). Larvae also occasionally feed on Douglas Fir (Pseudotsuga menziesii).

The Ceanothus Silkmoth occurs in the dry intermontane valleys and interior of BC (as far north as Prince George along the Fraser River) south to Baja California. The only AB record of this species is for a live specimen introduced along with a shipment of ornamental shrubs from Oregon to Red Deer (E. Mengersen, pers. comm.). There is a small possibility this species is present in the Waterton / Castle River area of AB.

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Comments (8)Add New Comment

Karen Bell (2011-05-31)
My husband found a moth that looks like this but slightly more brown. It looks like the same markings. It was in Washington State just north of Poulsbo. Is that possible?

James Parent (2013-05-20)
I saw a lovely living specimen near Winslow Wharf Marina on Bainbridge Island, WA on may 19, 2013. I judged it to be a female since its antenna was of the less bushy type than the male. It crawled onto my outstretched finger and flexed its wings for several minutes before flying off. This location is about 10 miles from Poulesbo, WA where another specimen was reported on your site.

Sally Smethie (2014-06-01)
I just identified this moth online. It's been on my front porch all day, funny thing is I live near Richmond Va.

Pepper Kim (2014-06-02)
As far as I can tell, a female moth of this species rested on a door to my house today in Vancouver, WA. Its antennae are dainty; thus, it seems to be female. The colors are more in the brown range, rather than maroon, but the markings are exactly the same. The wingspan is a bit longer than 4.5". It remained on my door for several hours. Then,apparently, it died and fell from the middle of the door straight down, where I found it, fully intact.

Beth Lee (2016-04-16)
Just discovered one on an old saw horse that I took out of our garden yesterday. It's laying eggs. We saw where it had also laid eggs on a nearby concrete block. Are these harmful to fruit trees and gardens?

Beth Lee (2016-04-16)
Forgot to add that is in southwest Oregon.

Crickets Meyeres (2017-05-24)
Sighted may 22, 2017 in kanab, southern Utah! May have been newly adult because was fanning its wings slowly as if to dry them and exercise/practice flying. Then flew off.

Tom Turner (2017-06-07)
Sally Smethie - I believe what you found was a tuliptree moth. I first identified the ceanothus I found as a tuliptree moth but the range was completely wrong and it didn't have the white head marking. Also, the nike swoosh was more of a "T" shape. Otherwise they seem identical.

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Related Species Info
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Specimen Info
There are 13 specimens of this species in the online database
Map Distribution
Adult Seasonal Distributioncreate a collection histogram with specimens
Specimen List (13)
Related Links
Moth Photographers Group


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