Leaf Beetles

Definition

Members of the beetle family Chrysomelidae, a megadiverse group of phytophagous Coleoptera comprising over 37,000 described species. Adults and larvae typically feed on living plant tissue—especially leaves, though many mine stems or roots—making them significant herbivores in virtually all terrestrial ecosystems and major pests of agriculture and forestry. The family is distinguished from related groups by a combination of characters including short to moderate antennae, a pronotum that narrows posteriorly, and tarsi that appear four-segmented (pseudotetramerous) due to reduction of the fourth segment. Larval habits are diverse: some are external foliage feeders, others are stem borers, root feeders, or leaf miners.

Etymology

From the feeding habit of adults on leaf tissue; the family name Chrysomelidae derives from Greek chrysos (gold) and melas (black), referring to coloration of type species.

Example

The Colorado potato beetle (Leptinotarsa decemlineata) and the cereal leaf beetle (Oulema melanopus) are economically destructive leaf beetles; the former is a major pest of Solanaceae crops, while the latter damages wheat and other grasses.

Synonyms

• Chrysomelidae

Related Terms

• Coleoptera
• Phytophagy
• Galerucinae
• Bruchinae
• Chrysomelinae
• Host plant resistance
• Herbivory

Usage Notes

In strict usage, 'leaf beetle' refers specifically to Chrysomelidae, not to any beetle found on leaves; many cerambycids, curculionids, and others also feed on foliage but belong to different families. The subfamily Bruchinae (seed beetles) is sometimes treated as a separate family Bruchidae in older literature. Larval habits vary enormously within the family—some groups (e.g., Hispinae) are leaf miners with highly modified, flattened larvae, while others (e.g., many Alticini) have soil-dwelling root-feeding larvae despite the jumping adult habit.