American Spiders
American Spiders
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In our eReader you can find the full English version of the book. Read American Spiders Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book American Spiders
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The gradual reduction and loss of the units of internal segmentation were matched in the external plates, which resulted in an actual migration forward toward the spinnerets of the anal tubercle. The cephalothorax of the ancestral spider was relatively long as compared with its width, and was marked by a longitudinal median groove. At the front end were eight eyes set close together on a low tubercle. The legs were of moderate length, quite stout, and each tarsus had at its tip three tarsal cla...ws, the outer paired ones relatively long and smooth, the inner unpaired one short and only slightly curved. The chelicerae were large, set parallel to the long axis of the body, with robust fangs. The gland in the basal segment secreted a weak poison, largely unnecessary since to subdue prey reliance was placed mainly on the strong legs and sharp fangs. The earliest spiders were cautious hunters that groped about on THE EVOLUTION OF SPIDERS 101 the ground and made little effort to establish a permanent station of refuge.
What to read after American Spiders?
You can find similar books in the "Read Also" column, or choose other free books by Willis John Gertsch to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The gradual reduction and loss of the units of internal segmentation were matched in the external plates, which resulted in an actual migration forward toward the spinnerets of the anal tubercle. The cephalothorax of the ancestral spider was relatively long as compared with its width, and was marked by a longitudinal median groove. At the front end were eight eyes set close together on a low tubercle. The legs were of moderate length, quite stout, and each tarsus had at its tip three tarsal cla...ws, the outer paired ones relatively long and smooth, the inner unpaired one short and only slightly curved. The chelicerae were large, set parallel to the long axis of the body, with robust fangs. The gland in the basal segment secreted a weak poison, largely unnecessary since to subdue prey reliance was placed mainly on the strong legs and sharp fangs. The earliest spiders were cautious hunters that groped about on THE EVOLUTION OF SPIDERS 101 the ground and made little effort to establish a permanent station of refuge.
What to read after American Spiders?
You can find similar books in the "Read Also" column, or choose other free books by Willis John Gertsch to read onlineMoreLess
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