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I found this larva in Sweden in July. It was about 15 mm long. It reminded me of Orgyia antiqua that I've seen before, but smaller and with a somewhat different colouration.

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I think it's indeed a young, and possibly worn, specimen of Orgyia antiqua (also Rusty Tussock Moth or Vapourer, see also UKmoths). This species is relatively common in large parts of Sweden. However, the tufts and "tail" are usually more pronounced, but there is probably intra-species variation, and old, worn individuals can have sparser tufts. As you say, they are usually longer than 1.5cm but there is large variation, sexual dimorphism and younger larvae (early instars) are natually smaller.

enter image description here (picture from wikipedia)

Swedish specimen: enter image description here ( from http://krypinaturen.se/fjarilar-lepidoptera/nattfjarilar/tofsspinnare-lymantriidae/orgyia_antiqua_1878_20130626/)

Lymantria dispar is rather rare in Sweden and is only found in certain localities in the south (Blekinge, Småland coast) along with Öland and Gotland.

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  • $\begingroup$ It's so hard when they don't look like perfect representatives of their species! But this sounds convincing enough. Thanks! $\endgroup$ – picapica Dec 11 '15 at 22:19
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This caterpillar is known as Lymantria dispar dispar. Not to be confused with the Lymantria dispar, as the Lymantria dispar dispar is the classified as it's subspecies for the sake of further taxonomy. The Lymantria dispar dispar, is locale to Europe and North America (via migration), the latter being sourced in Asia. They only possess a minor (however it's deemed as rather significant in the animalia kingdom) difference - the female Asian Gypsy moth can fly!

In the contrary, The U. S. Department of Agriculture, defines the Asian Gypsy moth by means of flight capability partially ignoring location; "any biotype of Lymantria dispar possessing female flight capability". Which demonstrates the evident flair in confusion on this topic.

The difference in the moths visual appearance in comparison to the pictures of species you'd more commonly see (i.e. the color of its head), is possibly due to the stage of maturation of the Caterpillar or the present season. That's just my hypothesis though, i am unaware of any evidence to back that up.

Here are some further images: http://www.papillon-poitou-charentes.org/Lymantria-dispar-Linnaeus-1758,4446.html

Reference to the facts: https://en.wikipedia.org/wiki/Lymantria_dispar_dispar

(Edit: I was proved incorrect! However, this information would be useful for others who seek the answer!)

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  • $\begingroup$ Are you sure? They don't look alike to me. :-/ $\endgroup$ – anongoodnurse Oct 29 '15 at 20:28
  • $\begingroup$ I'm fairly certain... not all from the species look identical just like, zebras don't all have the same distribution of stripes. It's difficult to say with 100% certainty since, nothing looks exactly same! Sorry, if this sounds sloppy - I'm very tired :P $\endgroup$ – user19679 Oct 29 '15 at 20:42
  • $\begingroup$ I think that's incorrect. The OP's caterpillar has dorsal tussocks on segments 4, 5, 6 and 12 (or abdominal segments 1, 2, 3, and 9.) Yours has none. That's a big mismatch. Note, I didn't find a match yet, either. $\endgroup$ – anongoodnurse Oct 29 '15 at 20:47
  • $\begingroup$ Also, do you have any idea why my answer on another health post is being classed as 'spam'? I followed the advice posted on getting past this issue but to no prevail? $\endgroup$ – user19679 Oct 29 '15 at 20:48
  • $\begingroup$ I have absolutely no idea then... However, I'm 100% certain that it's from the genus 'lymantria' - feel free to check through the 220 other species of that genus ;) I apologise for my mistake. $\endgroup$ – user19679 Oct 29 '15 at 20:56

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