john2072
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Dołączył: 26 Sty 2011
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 Wysłany: Czw 1:21, 31 Mar 2011 Temat postu: all arthropods |
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of the Paleozoic Era.Trilobite PopularitySo, what was the trilobite and what about it inspires such fondness among students of all ages? Could it be its unusual body armor that allowed for unique defense mechanisms? Perhaps it’s the almost friendly appearance, with its prominent “face.” Or is it simply because of its broad diversity among the remnants of a long extinct species? A close look at this ancient creature reveals a certain familiarity [link widoczny dla zalogowanych], sharing characteristics with modern-day species known to us all.Arthropods of DistinctionI’ve already mentioned that the trilobite was one of the first arthropods. Arthropods still exist today, of course; they are those creepy, crawly bugs that invite themselves to our picnics (ants, spiders, mosquitoes [link widoczny dla zalogowanych], and the like) or the crusty seafood delicacy that occasionally graces our tables. (Take your pick, shrimp, lobster or crayfish: all arthropods [link widoczny dla zalogowanych]!) The trilobite earned its place among the arthropods because it had a hard exoskeleton, a body that had at least a couple of sections, and jointed legs.ExoskeletonIt’s pretty easy to observe the hard exoskeleton in a trilobite fossil. It’s the part that turned to stone! That process is another whole story, but the important part is that in the tr
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