Image: Stonefly

Stonefly

Stonefly, line drawing.

Creator:
Andrew Howells
Rights:
© Australian Museum

Notes

Wht do stoneflies look like?

Size:
  • 4 mm - 60 mm in length.
  • Wingspan 10 mm - 110 mm.
Body:
  • Column-like and often flattened.
  • Appears soft and fragile.
Antennae:
  • Thread-like, with many segments.
  • Often longer than half body length.
Eyes:
  • Bulging and well separated.

Mouthparts:
  • For chewing or munching.
  • Held in front at rest.
Wings:
  • Two pairs if present.
  • Both pairs membranous and clear.
  • Most species have moderate number of wing cross-veins that form long rectangular cells.
  • Few species have numerous cross-veins and cells.
  • Hindwings are shorter and wider than the forewings.
  • At rest, wings overlap and are held flat over body or often curving around the abdomen.
  • Generally cover the abdomen though a few species have short wings.
Limbs:
  • Six short legs.
  • Fore- and midlegs held out from body and bent at 'elbows'.
Abdomen tip:
  • Two moderately long cerci (tails) with many segments.

Where are stoneflies found?

  • Close to creeks or rivers generally on adjacent vegetation, or behind bark and logs.

What do stoneflies do?

  • They are solitary.
  • When disturbed they are reluctant to fly: often running quickly to cover, raising wings to appear larger or flying away to land again soon after.
  • They are weak flapping fliers, only flying in short bursts.
  • Most use colours and patterning to blend in with their surroundings. Though some large alpine species have brightly coloured wings.
  • They feed on plant debris, algae, lichen, rotting wood and bark.
  • They are active during either the day or night; night active species are attracted to lights.

What looks similar?

  • Alderflies or dobsonflies can look a lot like stoneflies. However they can be distinguished by the fact most hold their wings tent-like, they do not have cerci (tails), and they hold their legs underneath their body.

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Tags stoneflies, insects, invertebrates, identification, Bugwise,