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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 --047d7b6773b037388004e43559bc 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>"= ;<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">."</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">"</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.= "</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"><<a href=3D"mai= lto:dendroica.caerulescens@gmail.com" target=3D"_blank">dendroica.caerulesc= ens@gmail.com</a>></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'm confident they are noth= ing more than highly evolved "hairs", 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"><= ;<a href=3D"mailto:nancypdowd@gmail.com" target=3D"_blank">nancypdowd@gmail= .com</a>></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'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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