Cup-moth
Guides
Monema
slug moths, cup moths
Monema is a genus of medium-sized yellowish moths in the family Limacodidae, commonly known as slug moths or cup moths. The genus comprises at least four described species distributed across East and Southeast Asia. Members are notable for their larval morphology: caterpillars are flattened, legless in appearance, and move using suckers and liquefied silk lubricant in a wave-like motion resembling slugs. The genus includes significant forestry pests, particularly Monema flavescens, which has been introduced to North America.
Monema flavescens
Oriental moth
Monema flavescens is a medium-sized moth in the family Limacodidae (slug moths or cup moths), native to East Asia. Adults exhibit yellowish coloration typical of the genus, with males having a wingspan of 30–32 mm and females 35–39 mm. The larvae are polyphagous defoliators of broadleaf trees, bearing urticating spines that can affect human health. The species has one to two generations per year depending on region, with adults active from late June to August. It has been introduced to Massachusetts, USA, and is considered a potential quarantine pest for Europe.