Arthropods - Regeneration in Invertebrates
Among arthropods like insects, crustaceans, centipedes, scorpions and spiders, the capability of regeneration is low or not present. They do not have the capability to regenerate head or tail. In most arthropods, just only some or all appendages can be regenerated; regeneration is correlated, along with moulting or ecdysis and can occur only as long as the animals growth is not complete. Crustaceans are capable of regenerating appendages during life because they do not stop growing at any stage of development including the adult like periodic multing keeps occurring through tout adult life. Crabs and spiders exhibit autotomy. On being caught by their enemy they shed their limb at a pre-fixed breaking point across the second joint through violent contraction of extensor muscle. The part of the appendage lost by autotomy is after that it regenerated.