Rob Coleman's picture

Empty pupal case

Observed: 1st May 2010 By: Rob ColemanInvertebrates expert

Found this pupal case attached to a beech tree in mature decidous woodland. Its about 25mm long and 8mm wide. What came out of it?

Species interactions

No interactions present.

Species with which Black Arches (Lymantria monacha) interacts


RHoman's picture

Pupal case

Some of the Lymantrids have "hairy" pupal cases - Vapourer perhaps? A slightly sharper view of the cremaster might help.

Robert Homan

rimo's picture

I think this is too large for

I think this is too large for Vapourer - their pupae are usually around 15mm. This definitely looks like a Lymantrid of some sort, but I can't find anything that fits - closest I can find is White Satin, but that would be about 9 weeks early. Anyone know any other fairly chunky, hairy-pupa'd candidates?

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Martin Harvey's picture


Are these hairs, or could they be some sort of fungal infection? There also seems to be a larval case of the micro-moth Psyche casta at the top of the picture!

Entomologist and biological recorder

Rob Coleman's picture

I've added a couple of extra

I've added a couple of extra pictures of this - with a scale in mm. I'm not sure this helps too much?!

Rob Coleman

rimo's picture

I've spent a couple of years

I've spent a couple of years working on fungal infections in insects, and it just doesn't giss right for a fungus - no further forward on what it actually is though!

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