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Need caterpillar on willow IDs, yippee!

Posted by bernergrrl z5 NH (My Page) on
Sat, May 10, 08 at 20:13

Yeah!! Woohoo--I found two caterpillars today on a couple of willows around here. I didn't expect to find anything, and lo and behold: 2 babies. I'm not sure what they are, but they must either be a viceroy, white admiral, or red-spotted purple.

Any help appreciated! Sorry the pics aren't great--I have to figure out how to get close-ups with my camera.


Follow-Up Postings:

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RE: Need caterpillar on willow IDs, yippee!

Yeah, it looks like a Red-spotted Admiral (Limenitis arthemis) or Viceroy (Limenitis archippus). Given that it's almost black, I would lean toward the former. Congratulations!
-Jmcat


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RE: Need caterpillar on willow IDs, yippee!

Congratulations!
It's definitely one of those three, but I can't tell the difference between them for sure. I'll guess red-spotted purple, since the cats are usually dark like yours with darker, longer "horns" than viceroys have - please let us know when the adult emerges from the chrysalis!
Sherry


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RE: Need caterpillar on willow IDs, yippee!

  • Posted by ladobe 8b NV - 11 HI (My Page) on
    Sat, May 10, 08 at 21:44

As you've already guessed, probably has to be either Limenitis arthemis arthemis, L. astyanax astyanax or L. archippus archippus in the New England states, or a hybrid of them.

For those especially interested in this group...

Some authors use Basilarchia instead of Limenitis FWIW (the genus name used for this group on other continents). It gets real confusing identifying the larvae of this genus out west where we have at least L. arthemis rubrofaciata, L. astyanax arizonensis, three subspecies of L. archippus, 5 subspecies of L. weidemeyeri and 2 subspecies of L. lorquini. I was very fortunate to do rearing work for years with Austin Platt (Professor of Biological Sciences at UMBC) on the population biology and genetics of this group in North America. All species can be made to intergrade in lab controlled mating, with the resulting characteristic ratios of those crosses now pretty much known. So they could also hybridize in nature as well where ranges overlap. Some crosses are extremely rare in nature though, even in blend zones. I have a great series on this group and its hybrids in my synoptic collection from my work with Austin, including an example of the rarest of the rare hybrids - an interspecific hybrid form rubidus dark morph that came from a female L. a. archippus X male L. a. astyanax in 1983. At the time it was one of only about a half dozen known. If you really want to know more about the intra and inter specifics of this group (complete with color plates showing the relationships), Austin has published it. My copy is buried somewhere in storage and I can't remember the year or title - sorry.


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RE: Need caterpillar on willow IDs, yippee!

Hi everyone--Thanks for the responses. Ladobe, last night I went into my guide book and did notice the different genus name. (I'm getting my toes wet, taxonomically speaking.)

Last year I saw what looked like a hybrid between the red-spotted purple (b. astyanax) and the white admiral (b. arthemis). It looked like a RSP, but it had very short white bars on the forewings.

We'll see what these turn into!

Thanks again!

Perhaps, these little guys are


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RE: Need caterpillar on willow IDs, yippee!

Thought some of you might be interested in seeing this L. astyanax X L. archippus hybrid. This live picture was taken in Pennsylvania.

http://www.pbase.com/rcm1840/image/48665510


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RE: Need caterpillar on willow IDs, yippee!

Thanks lepalot! That is very interesting! I wish I had had my camera last year for what I think was a hybrid.


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RE: Need caterpillar on willow IDs, yippee!

Last night I found another one that was dark on its hibernaculum. Brought that one in too.

I was worried about the first one because it hadn't been doing much of anything--no eating and no frass while the other one (the brown one) has been munching and making frass.

This morning the first one had molted, so it seems the first order of business is shedding the winter cuticle. I was wondering why it was hanging out on a shriveled brown leaf when there was so many tender leaves to be eating.


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RE: Need caterpillar on willow IDs, yippee!

Yes, they get real still when they're molting/in between instars, bernergrrl. It'll start eating again very soon.
I've got one red-spotted purple in a cage, but after seeing several outside cats - 2 palamedes and a tiger - disappear, I've been bringing in more cats. I think I'm going to bring in 2 very early instar red-spotted purples today. I don't like raising them when they're that young, but I think I'm going to make an exception.
Sherry


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RE: Need caterpillar on willow IDs, yippee!

Thanks MissSherry! I was a little worried about the little guys. Make sure you take it easy! I'm bringing in any cats I find on willows because last year found some cats, but they had all been parasitized or attacked by wasps. I feel a little protective about them, like you.


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