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"The larvae <http://en.wikipedia.org/wiki/Larva> are brightly coloured,
with tufts of hair-like setae <http://en.wikipedia.org/wiki/Setae>."

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"Setae in entomology <http://en.wikipedia.org/wiki/Entomology> are often
called hairs or chaetae <http://en.wikipedia.org/wiki/Chaeta>. They are
unicellular and formed by the outgrowth of a single epidermal cell
(trichogen). They are generally hollow and project through a secondary or
accessory (tormogen) cell as it develops. The setal membrane is not
cuticularized and movement is possible. This serves to protect the body."


On Sat, Aug 17, 2013 at 7:30 PM, Rick Whitman <
dendroica.caerulescens@gmail.com> wrote:

> I feel that you are under-estimating the power of natural selection i.e.
> if it benefits the organism, in terms of survival, it just might happen.
> I'm confident they are nothing more than highly evolved "hairs", that can
> be moved in a defensive manner.
> Best, Rick.
>
>
> On Sat, Aug 17, 2013 at 6:41 PM, nancy dowd <nancypdowd@gmail.com> wrote:
>
>> A week ago I took a picture of this fast-moving and impressive, albeit
>> common, White-Marked Tussock Moth Caterpillar (Orgyia leucostigma).
>> Pls correct the ID if wrong:
>> http://www.flickr.com/photos/92981528@N08/9501075283/
>>
>> Then it reared its head up at me and waved its front tufts in the air.
>> Closeup of front end here:
>> http://www.flickr.com/photos/92981528@N08/9503879386/
>> Details are in photo captions.
>>
>> I thought caterpillar tufts and hairs were passive structures, moving
>> only as the body moves. But they must have muscle control to wave
>> independently of one another like that. Are they a modified antennae
>> or leg or? Can't find anything out searching the internet or in the
>> books I have so I will try here.
>>
>> Nancy
>>
>
>
>
> --
> Rick Whitman
>



-- 
Rick Whitman

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Content-Type: text/html; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">From wikipedia, from which all good things come:<div>&quot=
;<span style=3D"color:rgb(0,0,0);font-family:sans-serif;font-size:12.499999=
046325684px;line-height:19.192707061767578px">The=A0</span><a href=3D"http:=
//en.wikipedia.org/wiki/Larva" title=3D"Larva" style=3D"text-decoration:non=
e;color:rgb(11,0,128);background-image:none;font-family:sans-serif;font-siz=
e:12.499999046325684px;line-height:19.192707061767578px">larvae</a><span st=
yle=3D"color:rgb(0,0,0);font-family:sans-serif;font-size:12.499999046325684=
px;line-height:19.192707061767578px">=A0are brightly coloured, with tufts o=
f hair-like=A0</span><a href=3D"http://en.wikipedia.org/wiki/Setae" title=
=3D"Setae" class=3D"" style=3D"text-decoration:none;color:rgb(11,0,128);bac=
kground-image:none;font-family:sans-serif;font-size:12.499999046325684px;li=
ne-height:19.192707061767578px">setae</a><span style=3D"color:rgb(0,0,0);fo=
nt-family:sans-serif;font-size:12.499999046325684px;line-height:19.19270706=
1767578px">.&quot;</span></div>
<div><span style=3D"color:rgb(0,0,0);font-family:sans-serif;font-size:12.49=
9999046325684px;line-height:19.192707061767578px"><br></span></div><div><sp=
an style=3D"color:rgb(0,0,0);font-family:sans-serif;font-size:12.4999990463=
25684px;line-height:19.192707061767578px">&quot;</span><span style=3D"color=
:rgb(0,0,0);font-family:sans-serif;font-size:12.499999046325684px;line-heig=
ht:19.192707061767578px">Setae in=A0</span><a href=3D"http://en.wikipedia.o=
rg/wiki/Entomology" title=3D"Entomology" style=3D"font-family:sans-serif;fo=
nt-size:12.499999046325684px;line-height:19.192707061767578px;text-decorati=
on:none;color:rgb(11,0,128);background-image:none">entomology</a><span styl=
e=3D"color:rgb(0,0,0);font-family:sans-serif;font-size:12.499999046325684px=
;line-height:19.192707061767578px">=A0</span><span style=3D"color:rgb(0,0,0=
);font-family:sans-serif;font-size:12.499999046325684px;line-height:19.1927=
07061767578px">are often called hairs or</span><span style=3D"color:rgb(0,0=
,0);font-family:sans-serif;font-size:12.499999046325684px;line-height:19.19=
2707061767578px">=A0</span><a href=3D"http://en.wikipedia.org/wiki/Chaeta" =
title=3D"Chaeta" style=3D"font-family:sans-serif;font-size:12.4999990463256=
84px;line-height:19.192707061767578px;text-decoration:none;color:rgb(11,0,1=
28);background-image:none">chaetae</a><span style=3D"color:rgb(0,0,0);font-=
family:sans-serif;font-size:12.499999046325684px;line-height:19.19270706176=
7578px">. They are unicellular and formed by the outgrowth of a single epid=
ermal cell (trichogen). They are generally hollow and project through a sec=
ondary or accessory (tormogen) cell as it develops. The setal membrane is n=
ot cuticularized and movement is possible. This serves to protect the body.=
&quot;</span></div>
</div><div class=3D"gmail_extra"><br><br><div class=3D"gmail_quote">On Sat,=
 Aug 17, 2013 at 7:30 PM, Rick Whitman <span dir=3D"ltr">&lt;<a href=3D"mai=
lto:dendroica.caerulescens@gmail.com" target=3D"_blank">dendroica.caerulesc=
ens@gmail.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">I feel that you are under-e=
stimating the power of natural selection i.e. if it benefits the organism, =
in terms of survival, it just might happen. I&#39;m confident they are noth=
ing more than highly evolved &quot;hairs&quot;, that can be moved in a defe=
nsive manner.<div>

Best, Rick.</div></div><div class=3D"gmail_extra"><br><br><div class=3D"gma=
il_quote">On Sat, Aug 17, 2013 at 6:41 PM, nancy dowd <span dir=3D"ltr">&lt=
;<a href=3D"mailto:nancypdowd@gmail.com" target=3D"_blank">nancypdowd@gmail=
.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">A week ago I took a picture of this fast-mov=
ing and impressive, albeit<br>
common, White-Marked Tussock Moth Caterpillar (Orgyia leucostigma).<br>
Pls correct the ID if wrong:<br>
<a href=3D"http://www.flickr.com/photos/92981528@N08/9501075283/" target=3D=
"_blank">http://www.flickr.com/photos/92981528@N08/9501075283/</a><br>
<br>
Then it reared its head up at me and waved its front tufts in the air.<br>
Closeup of front end here:<br>
<a href=3D"http://www.flickr.com/photos/92981528@N08/9503879386/" target=3D=
"_blank">http://www.flickr.com/photos/92981528@N08/9503879386/</a><br>
Details are in photo captions.<br>
<br>
I thought caterpillar tufts and hairs were passive structures, moving<br>
only as the body moves. But they must have muscle control to wave<br>
independently of one another like that. Are they a modified antennae<br>
or leg or? Can&#39;t find anything out searching the internet or in the<br>
books I have so I will try here.<br>
<span><font color=3D"#888888"><br>
Nancy<span class=3D"HOEnZb"><font color=3D"#888888"><br>
</font></span></font></span></blockquote></div><span class=3D"HOEnZb"><font=
 color=3D"#888888"><br><br clear=3D"all"><div><br></div>-- <br>Rick Whitman=
<br>
</font></span></div>
</blockquote></div><br><br clear=3D"all"><div><br></div>-- <br>Rick Whitman=
<br>
</div>

--047d7b6773b037388004e43559bc--

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