Development And Life Cycles


Whether external to the female parent's body (oviparity) or temporarily within (viviparity), all insects, spiders, and allied terrestrial arthropods start their lives as eggs (Hinton 1981). Eggs come in an amazing variety of shapes and sizes. They are usually placed singly or in groups in proximity to the juvenile's food source but may be scattered indiscriminately only in the general habitat where development occurs. Many have elaborate cuticular sculpturing, and some possess devices for attachment to the substratum or caps (opercula) that open to allow egress of the young. A number of species protect their eggs from moisture loss and trauma by covering them with froth or encasing them in other substances that harden around them (oothecae).

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