Vertebrate
Mosquito is invertebrate .
of course a hamster is not an invertabrate! its a mammal
Just a fraction of all known species-fewer than 50,000 are vertebrates, such as mammals, reptiles, anphibians and fish. The rest are inverterbrates appeared in the Earth's oceans more than 650 million years ago. Today most inveterbrates still live in oceans, but they can be found in almost every habitat worldwide. Inveterbrates, unlike veterbrates have no backbone. In fact, they have no bones at all. Inveterbrate bodies are usually supported by some kind of skeleton. Spiders, Crustacean and insects are the main phylum of Inveterbrate.
It depends what you mean by "worm" and "bug"."Bug" is not a technical term. Sometimes a "bug" means an insect; sometimes it means any invetebrate. Most worms are invetebrates but none are insects.In every day speech, a worm is any long cylindrical soft-bodied creature with no legs. There are a great many cylindrical soft-bodied animals without legs, belonging to many different groups of animals.Earthworms, for example, are annelids - a type of inveterbrate animal. Parasitic worms (flatworms, roundworms, tapeworms, etc.) are members of different groups - such as Nematodes and others.