Mayflies, Stoneflies and Caddisflies all have 10 abdomenal body segments. The Midge family has 9, Damsels and Dragonflies have 8, Crayfish have 7, Sow Bugs have 8, while Scuds have 14 body segments. How many segment markings do you put on the fly patterns that you tie and fish?
Camouflage, Disruptive Coloration And Markings, For Fly Tying And Fly Pattern Selection
Most of the food forms fish eat have evolved with camouflaging pattern markings and disruptive coloration to protect them from becoming fish food. The fish, on the other hand, have also developed very astute visual abilities and they are hard wired to automatically see these symmetrical and random types of patterns that will excite the fish’s brain into prodding it toward attack or run for your life type actions, which are things we anglers and fly tiers should know all about and pay attention to before tying our flies and picking fly patterns to fish with. Here is a link to an article on The Mayflies Of Alaska, which is mostly pictures of 9 different mayfly nymph families, showing their segmentation and other common characteristics.
Please pay particular attention to the Segmentation, the Symmetrical and Random Markings, the different Body Types and Breathing Gill structures, and try to imagine how these things can be incorporated into our fly patterns. https://www.naturebob.com/sites/default/files/Mayflies%20by%20John%20Hudson,%20Katherine%20Hocker,%20Robert%20H.%20Armstrong.pdf