Non-vertebrate chordates are those animals that have a notochord but no true backbone. There are two groups known as the tunicates and lancelets. Tunicates include sea squirts and salps. Lancelets are a group of burrowing filter feeders that live on the ocean floor.
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Some examples of non-ocean mammals are:
Non-placental mammals include the monotremes (Echidna and Platypus), which are egg-laying mammals, and marsupials, (Kangaroos, opossums) which are often referred to as pouched mammals.