Black Widow Spiderlings | Black Widow Spiderlings | This group of black widow spiderlings, or baby spiders, look like adult spiders, just very much smaller. Like all arthropods, spiders have a tough outer “skin” or exoskeleton, said Merri Lynn Casem, professor of biological science. “The spiderlings must shed their exoskeleton in order to grow. The process of shedding the exoskeleton is called molting. The period of time between the molts are called ‘instars.’ These spiderlings have gone through their first true molt and are considered ‘first Instars.’ The cloudy material in their abdomens is the yolk material left over from when they were eggs.” Photo Courtesy of Merri Lynn Casem

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