Rhizotrogini

Rhizotrogini

Classification

Pronunciation

How to pronounce Rhizotrogini: //ˌraɪzoʊˈtrɒdʒɪnaɪ//

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Images

Summary

Melolonthinae is a subfamily of scarab beetles, known for its diversity and economic significance as agricultural pests. They display significant sexual dimorphism and vary widely in appearance and habitus.

Physical Characteristics

Melolonthinae adults range from 3 to 58 mm in length, usually brown or black in color. The outer appearance is often not bizarre; some species are shiny, while others are covered in setae or scales. The clypeus is not armed with teeth, antennae possess 7 to 10 segments with the last segments forming a club, and the scutellum is exposed at the base of the elytra. Legs end in tarsal claws that are often toothed or double.

Identification Tips

Males have large fingered antennae while females have smaller, knobby ones. Look for distinct bands of setae or scales on the body, and observe body length ranging from 3 to 58 mm.

Habitat

Adults occur above ground, while larvae develop in soil. Commonly found in various habitats that support host plants such as grasses and trees.

Distribution

Distributed worldwide, except in the Afrotropical and Australasian realms.

Diet

Larvae feed on plant roots and humus, while adults may feed on tree leaves, flowers, or pollen. Known host plants include clover and sugarcane.

Life Cycle

Lifecycle includes four stages: egg, larva, pupa, and adult. The larval stage is long, living up to two years, while the adult stage is short, lasting days to weeks.

Reproduction

Sexual dimorphism in antennae aids in mate attraction; males may locate virgin females via pheromones.

Ecosystem Role

Some species are significant pests affecting agriculture, particularly in their larval stage.

Economic Impact

Larvae of certain species are pests of sugarcane, corn, and various fruits; adults can defoliate deciduous trees, impacting forestry and agriculture.

Cultural Significance

Notably represented in folklore, particularly the 'June beetles' from the Melolonthini tribe due to their swarming behavior.

Evolution

Melolonthinae is a diverse subfamily within Scarabaeidae, previously related to Melolonthini before classification changes.

Similar Taxa

Tags

  • beetles
  • scarab beetles
  • Melolonthinae
  • pests
  • agriculture