Platycnemididae

Common name

White-legged damselflies or Featherleg damselflies

Overview

The family Platycnemididae consists of small to medium-sized damselflies that are predominantly known for their unique leg morphology. These insects are proficient flyers and are commonly found around freshwater habitats like streams and rivers.

Taxonomy

Key Characteristics

  • Slim, elongated bodies typically measuring between 30-40 mm in length.
  • Notable broad, flat legs often with white or pale markings.
  • Wings are held closed over the body when at rest.
  • Compound eyes are well-separated on either side of the head.
  • Males often exhibit brighter coloration compared to females.

Life Cycle

  1. Egg: Laid in or near water.
  2. Nymph: Aquatic larvae that undergoes several molts.
  3. Adult: Terrestrial stage where reproduction occurs.

Behavior and Ecology

  • Inhabits freshwater systems such as rivers, streams, and ponds.
  • Males are territorial; they defend prime breeding habitats.
  • Predatory both as nymphs and adults, consuming smaller insects.
  • Engage in elaborate courtship displays which include visual and tactile signals.

Notable Species

  • Platycnemis pennipes: Commonly known as the White-legged Damselfly, distributed in Europe and Asia.
  • Copera marginipes: Distributed in Southeast Asia and notable for its distinctive feather-like legs.

Conservation

Significance to Humans

  • Indicator of healthy freshwater ecosystems.
  • Help control mosquito populations and other small insects, benefiting agriculture and human health.

Fun Facts

  • These damselflies get their common name from the males' feather-like legs, which they use in courtship displays.
  • Like all damselflies, Platycnemididae have excellent vision and can see nearly 360 degrees around them.
  • They can remain underwater as nymphs for several months to years, depending on the species.
  • The vibrant color and delicate structure make them a favorite subject for macro photographers.