Actually chief...an exoskeleton is any form of skeleton on the outside of the organism. this can be chitinous (sort of like that hard shell on crayfish or "bugs" i.e. arthropods), hydrostatic (which is closest to what you are describing i.e. slugs, worms, etc.) and several others. A n exoskeleton can also be combined with an endoskeleton in organisms like fish(scales) and turtles(shells). There are several other types also which i do not know enough about to comment.
So yes, jellyfish have hydrostatic exoskeltons
bluebottle jellyfish do not have backbones. in fact, all jellyfish do not have backbones. even though they are called jellyFISH they are invertebrates.
Backbones
a jellyfish and a octopus have no backbones
The jellyfish and the worm are both invertebrates, which means they are animals without backbones.
Jellyfish do not have backbones therefore they are known as invertebrates. Jellyfish belong to the to the phylum Cnidaria group of species.
The animals with no backbones are earthworms, centipedes, millipedes, jellyfish, arthropods like spiders, flies, bees, beetles and grasshoppers, and cephalopods like octopi, crayfish, lobsters and shrimp, squid, clams, mollusks. These animals are all called invertebrates.worms and jellyfish have no backbones xx
clown fish,mudfish,catfish,seahorse
Frogs have backbones.
Frogs have backbones
A Portuguese man of war is similar to a jellyfish, so it has no backbone.
Animals without backbones vary because, for example jellyfish are different from a sponge because a jellyfish have 1 body opening and that is the mouth. The sponge is different because they stay fixed either on a rock or on other hard surfaces.
invertabers