Vertebrates, including humans, have an endoskeleton. The other two types of skeletons are hydroskeletons and exoskeletons.Continue Reading
The root word "endo-" comes from the Greek word "endon" meaning "inside or within." An endoskeleton is a skeleton that is contained inside the body, and is made up of cartilage and bones. The bones offer support and structure, while cartilage provides cushioning and flexibility. Some vertebrates, such as sharks, have a skeleton that is composed mostly of cartilage. Most vertebrates, including humans, have cartilage that is eventually replaced by bone as the body grows.
In contrast, "exo-" is derived from the word for "external or outside." Animals with an exoskeleton include grasshoppers, cockroaches, lobsters and crabs. Earthworms, jellyfish, starfish and other soft-bodied creatures have a hydroskeleton, also referred to as a hydrostatic skeleton.Learn more about Zoology
Tunicates, vertebrates and lancelets are chordates, members of the animal phylum Chordata. All chordates have, at some point in their lives, a structure resembling a spinal cord, according to Wildlife Journal Junior. This can be a notochord, which is present in the lancelet throughout its life but disappears in the adult tunicate.Full Answer >
All vertebrates, segmented worms, such as earthworms, and cephalopods, such as squid, have closed circulatory systems. Closed circulatory systems allow larger animals to be much more active than those with open circulatory systems, which are relatively inefficient in delivering oxygen to the organs and muscles.Full Answer >
The main difference between vertebrates and invertebrates is that vertebrates have backbones as part of their endoskeletons, whereas the anatomy of invertebrates lacks this feature. Another difference is that vertebrates all belong to the phylum Chordata and the subphylum Verdata, while invertebrates represent a more diverse group of animals that belong to several different phyla.Full Answer >
The primary difference between vertebrates and invertebrates is the presence of a backbone or spinal column, which vertebrates have and invertebrates do not. Examples of vertebrates are humans, dogs, cats and birds. Examples of invertebrates are flatworms, mollusks, sea urchins and insects.Full Answer >