Egg Sac Silk

Spider silks exhibit very strong mechanical characteristics.  Each individual spider silk has its own unique chemical and physical properties, and molecular structure (Lepore et al. 2012).  Orbwebs, for example like the ones produced by Meta menardi include multiple types of silk in one web (Lepore et al. 2012).  Orbweb spiders have spinnerets, which are three paired appendage-like organs on their abdomen allowing them to produce many different types of silk thread that can be used together to make their web (Lepore et al. 2012).  Inside Slovenian Cave

Meta menardi produce large, white egg sacs and they suspend them from the walls or ceilings of the environment they live in such as a cave (Lepore et al. 2012).  The egg sacs range is size and have an average diameter of 2-3 cm (Fritzén and Koponen 2011).  They are considered to have the most stretchable egg sac silk of any orb-weaving spider allowing for maximum protection (Lepore et al. 2012).  They produce very densely packed fibers that randomly intertwine to form the strong structure that holds the egg sac (Lepore et al. 2012).  The strain that egg sac fibers could withstand was very high, and some were elongated more than 200% their original length (Lepore et al. 2012).  The egg sac silk was proved stronger, up to 750% stronger in terms of maximum strain than other tested species such as the dragline and minor ampullate silk (Lepore et al. 2012). 

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