This comes from "Biology of the Invertabrates" by Pechenik, published by McGraw-Hill. Double-click on the photos to enlarge.
I am sorry the quality of the photo comes out with the words blurred, but perhaps you can make them out when you click to enlarge it.
I thought it was interesting that the spider illustrated has five different silk-secreting glands. Each one secretes a different kind of silk, each specialized for a different function. Here is a quote from the book:
...silk, which may be used to form safety lines during climbing; egg sacs that protect developing embryos; fine threads for the aerial dispersal of newly emerged young; air-tapping diving bells for underwater foraging; and webs for trapping prey, building homes, or mating. Humans also have put arachnid silk to good use, notably as crosshairs in optical equipment.
An individual spider may contain up to 7 or more different silk glands that produce different, biochemically distinct forms of silk for different uses.
It is truly amazing and awe-inspiring to see how God has created this creature. The heavens declare His handiwork and so does all of creation.
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