When it comes to ingenuity, the Golden Tortoise Beetle (Charidotella sexpunctata) larva has all others beat! Instead of discarding its feces, it collects them and uses them as a means of chemical protection. Golden Tortoise Beetle larvae have a “fecal fork” on their last abdominal segment which they hold over their body. They also possess a muscular, telescopic anus which they can manipulate in such a manner as to deposit their feces onto their fecal fork. Bits of shed exoskeleton combined with days of feces accumulate on this fork and create an effective fecal shield. Golden Tortoise Beetle feces contain alkaloids from the plants that they’ve eaten (Bindweed and other plants in the family Convolvulaceae) and consequently the shield wards off predators. (Photo: Golden Tortoise Beetle larva with fecal shield; inset – adult Golden Tortoise Beetle)
Like other arthropods, spiders have a protective hard exoskeleton that is flexible enough for movement, but can’t expand like human skin. Thus, they have to shed, or molt, this exoskeleton periodically throughout their lives as they grow, and replace it with a new, larger exoskeleton. Molting occurs frequently when a spider is young, and some spiders may continue to molt throughout their life.
At the appropriate time, hormones tell the spider’s body to absorb some of the lower cuticle layer in the exoskeleton and begin secreting cuticle material to form the new exoskeleton. During the time that leads up to the molt (pre-molt period), a new, slightly larger, inner exoskeleton develops and is folded up under the existing exoskeleton. This new soft exoskeleton is separated from the existing one by a thin layer called the endocuticle. During the pre-molt period the spider secretes fluid that contains digestive enzymes between the new inner and old outer exoskeletons. This fluid digests the endocuticle that separates the two exoskeletons, making it easier for them to separate.
Once the endocuticle is completely digested the spider is ready to complete the molt. At this point a spider pumps hemolymph (spider blood) from its abdomen into its cephalothorax in order to split its carapace, or headpiece, open. The spider then slowly pulls itself out of the old exoskeleton through this opening.
Typically, the spider does most of its growing immediately after losing the old exoskeleton, while the new exoskeleton is highly flexible. The new exoskeleton is very soft, and until it hardens, the spider is particularly vulnerable to attack.
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