Seaweed Fly vs Winter Crane Fly

Side-by-side species comparison

Attribute Seaweed Fly Winter Crane Fly
Scientific Name Coelopa frigida Trichocera annulata
Order Diptera Diptera
Family Coelopidae Trichoceridae
Size 5-8 mm 5-10 mm
Habitat Beaches & Coastal Woodlands
Diet Detritivores Detritivores
Regions North Atlantic coasts of Europe and North America Europe, North America
Conservation Least Concern Least Concern

Seaweed Fly

A coastal fly whose larvae develop in rotting seaweed wrack on beaches. It forms massive swarms on strandlines that can annoy beachgoers.

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Did You Know?

It is a model organism for studying sexual selection because larger males win more mating contests.

Winter Crane Fly

A cold-adapted crane fly that forms mating swarms in winter even in freezing weather.

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Did You Know?

It can be seen dancing in aerial swarms on sunny winter days near buildings.