gary.hilton's picture

Caterpiller or Sawfly larva?

Observed: 10th July 2009 By: gary.hilton
S159 Neighbourhood Nature - course complete
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Caterpillar on Yellow Flag Iris
Caterpillar on Yellow Flag Iris (2)

Green Larva on well eaten Yellow Flag Iris leaf growing in pond. Has double rows of lighter coloured spots.

Species interactions

No interactions present.


Martin Harvey's picture


The number of fleshy 'prolegs' under the body (behind the three pairs of true insect legs) will show this to be a sawfly (moths have five pairs of prolegs at most, sawflies have at least six). And in this case the foodplant is a very good clue - there is only one sawfly that feeds on it, Rhadinoceraea micans, and it looks just like your photo!

Entomologist and biological recorder

JaseJ's picture

Iris Sawfly (Rhadinoceraea micans)

I'd agree with Iris Sawfly. I've also seen them on Yellow Flag recently:

Martin Harvey's picture

sawfly observations

Hi JaseJ, thanks for posting the link to your previous observation, I'd overlooked that one. Have just been back to it and given it a Spot-on!

Entomologist and biological recorder