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Sea invertebrates are marine organisms or animals that have no vertebral column or embryonic midline structure, called a notochord or spine, and account for about 95% of all species in the oceans.
This section contains facts and information about marine invertebrates along with a comprehensive list of common invertebrate species that live in different types of aquatic environments.
Unlike the vertebrates, around 98% of the species that live on earth do not have a typical backbone or notochord. They are spineless animals.
In fact, with the exception of a few vertebrates with backbones (such as birds, fish, and mammals), all animals are considered as being one of the thirty (30) different invertebrate phyla.
So, having some kind of strong skeletal support is the main reason why most vertebrates are bigger than invertebrates.
They are therefore more visible to humans. Whereas, most creatures in the wide ranging invertebrate group are much smaller and less visible.
Pro Tip: Another section contains extra information about 81,000 living species within the subphylum Vertebrata, with common examples of vertebrates fish, including sharks, rays, and saltwater angelfish.
Note: The main index section contains further information about sea life creatures with extra details about the threats they face from climate change and overfishing.