This division has no taxonomic significance. However, the term “invertebrates” is used descriptively in scientific and, particularly, educational literature.
Invertebrate is a time period used to describe any animal and not using a backbone or spinal column. The group consists of about ninety seven p.c of all animal species; that is, all animals except vertebrates, (subphylum Vertebrata of the phylum Chordata), which have a spine or spinal column.
Invertebrate, any animal that lacks a vertebral column, or spine, in distinction to the cartilaginous or bony vertebrates. More than 90 percent of all residing animal species are invertebrates. Worldwide in distribution, they embrace animals as numerous as sea stars, sea urchins, earthworms, sponges, jellyfish, lobsters, crabs, bugs, spiders, snails, clams, and squid.
Invertebrates can stay on land—like bugs, spiders, and worms—or in water. Marine invertebrates include crustaceans (similar to crabs and lobsters), mollusks (corresponding to squids and clams), and coral. Colonies … Read More