Lilioceris

Lilioceris species are 4–10 mm long with elongated, narrow bodies and a pronounced shoulder between the elytra and pronotum. Adults of some economically important species display bright aposematic coloration: L. lilii is scarlet red, while L. cheni has red and black patterning. Larvae carry distinctive fecal shields on their backs—a trait visible in L. lilii and L. cheni. The genus can be distinguished from related criocerine genera by body proportions and antennal structure, though species-level identification requires examination of genitalia.

The genus has its highest diversity in Asia, with approximately 80 species. L. lilii is native to Asia and occurs throughout Eurasia from Siberia to Morocco and from the United Kingdom to China; it is invasive in North America (eastern Canada and New England). L. cheni is native to Nepal and China and has been introduced to Florida for biological control.

• Liliaceae - herbivoryL. lilii feeds on native and cultivated lilies (Lilium spp.), fritillaries (Fritillaria spp.), and giant lily (Cardiocrinum giganteum)
• Dioscoreaceae - herbivoryL. cheni specializes on air potato vine (Dioscorea bulbifera)

L. lilii is univoltine, overwintering as adults that emerge in spring to feed and oviposit. Eggs are laid in rows on undersides of leaves. Larvae pass through four instars, carrying fecal shields, and pupate in soil. L. cheni has a lifespan of approximately 5 months in laboratory conditions, with females laying up to 1,900 eggs.

Larvae of L. lilii and L. cheni carry fecal shields on their backs, likely as a defensive adaptation against predators. L. cheni adults and larvae are voracious feeders, converting leaf tissue into eggs and creating ragged holes in host leaves. The bright red and black coloration of L. cheni adults is aposematic, warning predators of potential unpalatability due to host plant toxins.

Some Lilioceris species function as significant herbivores and agricultural pests. In their native ranges, they are subject to regulation by parasitoids. L. cheni has been successfully employed as a classical biological control agent, reducing bulbil production and vine density of invasive air potato in Florida.

L. lilii is a serious pest of ornamental lilies, causing complete defoliation of plants. L. cheni was introduced to Florida in 2011 as a biological control agent for invasive air potato; over 400,000 beetles were released by 2015, with documented reductions in host plant density. The Florida Department of Agriculture mass-rears L. cheni for ongoing distribution.

• CriocerisBoth are criocerine leaf beetles with similar body shapes; Crioceris species typically have different color patterns and host associations (asparagus)
• LemaRelated criocerine genus with some species feeding on monocots; Lema species often have more rounded bodies and different antennal proportions

• Chrysomelidae
• Criocerinae
• leaf beetles
• biological control
• horticultural pests
• Liliaceae
• invasive species management
• fecal shield larvae
• univoltine
• holometabolous

• BugGuide
• Wikipedia
• GBIF taxonomy match
• iNaturalist taxon
• NCBI Taxonomy
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