Pondside Crambid Moth

elophila icciusalis

The Pondside Crambid Moth (Elophila icciusalis) is a fascinating little moth deeply tied to freshwater environments. While most moths steer clear of water, this crambid species spends its larval stage fully submerged. The caterpillars are famous for constructing tiny, protective, portable cases from fragments of duckweed, pondweed, and other aquatic vegetation, breathing through specialized cutaneous respiration. Once they emerge as adults, these small, intricately patterned moths can be found fluttering delicately around the margins of ponds, marshes, and quiet lakes. They are highly active during the warmer months, contributing significantly to the wetland food web as both consumers of aquatic plants and prey for local fauna. Their dual-life journey from an underwater builder to a delicate aerial flyer makes them a marvel of insect adaptation.

Habitat: Found in close proximity to freshwater habitats such as ponds, marshes, fens, and slow-moving streams where floating aquatic vegetation is abundant.

Appearance

Adults of Elophila icciusalis are small, elegant moths with a wingspan of about 1 to 2 centimeters. Their forewings are intricately patterned with shades of pale cream, yellow-brown, and dark brown bands, often showing a distinctive white and brown wavy pattern. The hindwings are similarly light-colored with dark parallel lines running across them. The margins of their wings are fringed with fine hairs, giving them a soft, delicate appearance. Larvae are light green or cream-colored, typically hidden inside a flattened, bivalve-like leaf case.

KingdomAnimaliaPhylumArthropodaClassInsectaOrderLepidopteraFamilyCrambidaeGenusElophila

Pondside Crambid Moth

Interesting facts

Adults are extremely light and can land on the water's surface film without sinking, quickly taking off again if disturbed.

The caterpillars are entirely aquatic and live inside a case filled with water, getting oxygen directly through their skin.

To make their cases, the caterpillars cut neat oval pieces out of duckweed or water lily leaves and silk them together.

Special abilities

Caterpillars are adapted to live underwater, absorbing dissolved oxygen directly through their skin and utilizing air trapped inside their portable leaf cases.

Larvae construct protective, portable shelters out of cut pieces of duckweed or pondweed, helping them camouflage and avoid aquatic predators.

Adult moths possess water-repellent scales on their wings and bodies, allowing them to escape easily if they accidentally touch the water's surface.

Measurements & details

Length: 1 cm
Wingspan: 1-2 cm
Weight: 0.00001-0.00003 kg
Clutch Size: 50-150
Incubation: 7-14 days

Diet & Feeding

Larvae feed strictly on aquatic plants, while adults have highly reduced mouthparts and rarely, if ever, feed, relying entirely on larval energy reserves.

Age differences: Larvae feed voraciously on aquatic foliage, whereas adult moths do not feed, focusing solely on reproduction.

Primary Foods

Common Duckweed (Lemna minor)
Pondweed (Potamogeton spp.)
Water Lily (Nymphaea odorata)

Foraging Method

Grazing

Ecological connections

host plant

Common Duckweed

Lemna minor

Larvae use duckweed leaves both as a primary food source and to construct their protective portable cases.

eaten by

Bluegill

Lepomis macrochirus

Bluegills and other small aquatic fish feed on the swimming or drifting larvae of the moth in shallow waters.

eaten by

Green Frog

Lithobates clamitans

Green frogs sitting along pond edges readily snap up adult moths resting on emergent vegetation.

Traits

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Also known as

No aliases listed yet.

Collections

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Safety

Danger

1/5 · Very low

No special safety notes yet.

Frequently Asked Questions

How to identify Pondside Crambid Moth?

The easiest way to identify Pondside Crambid Moth is to use the Snappit nature identifier app.

How long is Pondside Crambid Moth?

1 cm

What is Pondside Crambid Moth's wingspan?

1-2 cm

How much does Pondside Crambid Moth weigh?

0.00001-0.00003 kg

What does Pondside Crambid Moth eat?

Larvae feed strictly on aquatic plants, while adults have highly reduced mouthparts and rarely, if ever, feed, relying entirely on larval energy reserves.

Where is Pondside Crambid Moth usually found?

Found in close proximity to freshwater habitats such as ponds, marshes, fens, and slow-moving streams where floating aquatic vegetation is abundant.

How does Pondside Crambid Moth hunt?

Grazing

How many eggs does Pondside Crambid Moth lay?

50-150