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The fangs on a true spider operate in a sideways mothion, like a pair of scissors.
The megalomorph, or bird eating spiders (t's) have fangs that operate in a stabbing downward motion. Its believed to be the more primitive form, as they have to crush prey into themselves risking injury, whereas in true spiders the fangs allow for more manipulation of prey at lesser risk. Thats pretty much the distinction. There are other points, but that is the most important.
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"All I know is my gut says maybe" Brachypelma albopilosum (Charlotte) 100's of Harvestmen Member of the BAS and AAS. |
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Their are 3 familys of spiders, True spiders which as posted early have jaws moving side to side, Primitive spiders our freinds the T`s whose move up and down and also a family from malaysia called the mesothelae, these spiders have segments on their abdomens. True spiders breath threw book lungs and primitive trachea. Primitive spiders breath threw booklungs, or something like that! not to bad from memory!
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Yeah, thats basically it - for once its something in biology that is quite simple and clear cut.
I'd suggest typing Arachnid into wikipedia - it has quite a good article on all arachnids, and how they relate to each other, suitable for those not into hardcore taxonomy.
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"All I know is my gut says maybe" Brachypelma albopilosum (Charlotte) 100's of Harvestmen Member of the BAS and AAS. |
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