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Today's arthropod:
The giant isopod is one of the largest isopods in the world, and it can be any one of the 20 species of big isopods. These creatures are in the cold and deep waters in the Pacific, Indian, and Atlantic oceans. Giant isopods are closely related to decapods such as crabs and shrimps, which are found in the Bathynomus genus.
It is the largest crustaceans and members of the isopod family. They are terrestrial crustaceans, much like the pill bugs. The resemblance is uncanny. These isopods are the ocean’s clean-up crew, and their large size is the result of the sea gigantism phenomenon.
Giant isopods are different than your typical isopod because they grow quite large. Their size is the result of abyssal gigantism which makes them grow between 6.7 to 19.7 inches in size for super-giant isopods, and the giant isopods reach 6 inches in size. The Bathynomus giganteus is the largest of the species, reaching nearly 30 inches in size. The morphology resembles the woodlouse and pill bug. They have calcareous exoskeletons made of overlapping segments.
They have large compound eyes that contain 4,000 facets and is separated on their head. The giant isopod has two pairs of antennae, and their first shell segments are fused to the head, which allows them to curl up into a ball that leaves their shell exposed as a form of protection against predators.