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Stream Mayflies

Heptageniidae

Stream mayflies are tiny insects that live in clean, fresh water. They have delicate wings and can often be seen dancing above streams on sunny days.

Habitat: Freshwater streams

Appearance

The Stream Mayflies has flattened, streamlined bodies adapted for fast-flowing water. They typically have two or three long, thread-like tails and prominent plate-like gills along their abdomen. Colors range from dull browns and greens to mottled patterns, helping them blend with riverbeds.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderEphemeropteraFamilyHeptageniidae
Stream Mayflies
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Stream Mayflies

Category

Insects

Rarity

Common

Danger

1/5 · Very low

Snaps

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Interesting facts

Adult mayflies have no functional mouthparts; they don't eat at all!

Mayfly eyes can be huge and divided, letting them see above and below water!

Some adult mayflies have two pairs of wings, but only use the front pair for flight!

They are the only insect group that molts after developing functional wings!

Special abilities

Ability

Grip Master

Stream Mayflies can cling tightly to rocks because they have flattened bodies and strong claws that help them resist swift currents.

Ability

Underwater Breather

Stream Mayflies has feather-like gills along their abdomen that helps them extract oxygen directly from the water while submerged.

Ability

Quick Change Artist

Stream Mayflies can shed their skin one last time after they grow wings, which helps them become even better, fully mature fliers.

Ability

Water Quality Sensor

Stream Mayflies can indicate clean water because their delicate nymphs are highly sensitive to pollution, helping them act as natural monitors.

Measurements & details

Wingspan
10-30 mm
Size
5-20 mm
Lifespan
30-365 days
Flight Speed
10 km/h
Leg Count
6

Diet & Feeding

Nymphs graze on tiny plants and decaying bits, while adults astonishingly do not eat at all!

Age differences: Nymphs are active feeders, but adults have non-functional mouths and do not eat during their short lives.

Primary Foods

  • algae
  • diatoms
  • detritus
  • decaying plant matter
  • fungi

Foraging Method

  • Grazing

Ecological connections

Traits

Also known as

No aliases listed yet.

Collections

Safety

Danger

1/5 · Very low

Always wash your hands after playing near water to stay clean and healthy.

Frequently Asked Questions

What is Stream Mayflies's wingspan?

10-30 mm

How big is Stream Mayflies?

5-20 mm

How long does Stream Mayflies live?

30-365 days

How fast can Stream Mayflies fly?

10 km/h

What does Stream Mayflies eat?

Nymphs graze on tiny plants and decaying bits, while adults astonishingly do not eat at all!

Where is Stream Mayflies usually found?

Freshwater streams

How does Stream Mayflies hunt?

Grazing

How many legs does Stream Mayflies have?

6

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