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Unknown Caterpillar

Unknown Caterpillar
Snohomish, Snohomish County, Washington, USA
September 24, 2013
Translucent green caterpillar with two broken, faint yellow stripes running down the back. This caterpillar was on a Lady Fern (Athyrium felix-femina).


Tenthredinidae, Selandriinae
Larvae of the western fern-feeding sawflies are not well known. Probably the only western one that may be on Athyrium is Hemitaonus primaries Smith, but the larva of that species is unknown.

For future exploits. How do
For future exploits. How do you differ between sawflies and lepidopteran larvae? I see that sawflies are actually Hymenoptera and not Diptera and I often see Eriocampa ovata on the Alders here.

Sawfly larvae
usually have large single black eyes on the side of the face where lepidopterans have multiple tiny eyes. Lepidopterans have four pair or fewer of abdominal prolegs where sawfly larvae have more than four pair. Sawfly larvae also often curl their bodies in a way that leps don't

Lepidoptera larvae have crochets, or small hooks, on the bottom of the prolegs. Sawfly larvae lack crochets.

The larva of a Sawfly
not lepidopteran

Moved from ID Request.

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