Atteva aurea, Ailanthus Webworm Moth

Atteva aurea, Ailanthus Webworm Moth, on Pycnanthemum, Mountain-Mint, in my garden last weekend. The intense colors are believed to be aposematic, a warning coloration to deter predators, probably because they would be distasteful.


The larvae - caterpillars - feed in communal aggregations, like tent caterpillars. Around the globe, caterpillars in the genus Atteva are known to feed on plants from at least a half-dozen plant families. But they favor plants in the Simaroubaceae, the Quassia Family.


The Quassia Family includes the infamous invasive tree, Ailanthus altissima, Tree-of-heaven, probably best known as "that tree what grew in Brooklyn." So, as Ailanthus has invaded here, Atteva aurea discovered a new suitable host. It's likely this has supported an increase in its numbers, and possibly its range, from its original native populations.

Taxonomic notes

Atteva is the sole genus in the subfamiuly Attevinae, the Tropical Ermine Moths, of the lovely-named family Yponomeutidae, the Ermine Moths. "Ermine" because the moths' coloration resembles that of the spotted forms of the coat of the Ermine, Mustela erminea. This is a photo of another Ermine Moth, Yponomeuta evonymella, showing the classic "ermine" pattern of that species. Image ©entomart, via Wikipedia/Wikimedia.


Per BugGuide, the family name, and the genus from which it arises, is likely a typographic error:

Family is named for genus Yponomeuta Latreille, 1796. That name was apparently a typographic error (!) for Hyponomeuta. That would be a combination of Greek prefix hypo under, plus nomeuta (unknown, perhaps from Greek pno air; breathing, plus meuta?)

The many ecotypes across the wide range of this species give rise to variations of color patterns. These variants have identified under many different specific epithets, and even other genera. (BugGuide notes: "This moth belongs to a species complex that was recently split"). Because of this, searching taxonomic-based resources, such as the Caterpillar Host Plants Database,  for this species may not identify all relevant records.

Related Content

Flickr photo set

Links

BugGuide
BAMONA
Wikipedia
HOSTS Database: Genus Atteva
The Plant List: Simaroubaceae
USDA Plants: Ailanthus altissima