Melolonthinae

Definition

A large subfamily of scarab beetles (Scarabaeidae) containing over 11,000 species in more than 750 genera, commonly called melolonthines or cockchafers. Adults are typically medium-to-large, often robust beetles with lamellate antennae; larvae are the familiar white grubs that feed on plant roots. The group is distributed worldwide and includes economically significant agricultural pests as well as decomposers and pollinators. Some classifications treat the subfamilies Euchirinae and Pachypodinae as tribes within Melolonthinae.

Etymology

From Melolontha, the type genus (Greek melolontha, an old name for the cockchafer beetle) + Latin suffix -inae (subfamily).

Example

The common cockchafer Melolontha melolontha and the June beetles of genus Phyllophaga are representative melolonthines whose root-feeding larvae damage turf and crops.

Synonyms

• melolonthines (common name)

Related Terms

• Scarabaeidae
• Melolontha
• Phyllophaga
• white grub
• lamellate antenna
• Scarabaeoidea
• Euchirinae
• Pachypodinae
• holometabolous

Usage Notes

As a subfamily name, Melolonthinae is always capitalized and italicized (or underlined) following the International Code of Zoological Nomenclature. The common name 'cockchafer' applies mainly to European species of Melolontha, while 'June beetle' or 'May beetle' is used for New World Phyllophaga and related genera. Larval identification to subfamily is practical (white, C-shaped, root-feeding grubs with well-developed thoracic legs), but genus- and species-level identification of larvae requires examination of raster patterns and mouthpart details. The subfamily's boundaries remain under revision; some authorities sink Euchirinae and Pachypodinae into Melolonthinae as tribes, while others maintain them as separate subfamilies.