​Invertebrates are species of animal that neither possess nor develop a vertebral column (commonly known as a backbone or spine), derived from the notochord. This includes all animals apart from the chordate subphylum Vertebrata. Familiar examples of invertebrates include arthropods (insects, arachnids, crustaceans, and myriapods), mollusks (chitons, snails, bivalves, and cephalopods), annelid (earthworms and leeches), and cnidarians (hydras, jellyfishes, sea anemones, and corals).

The majority of animal species are invertebrates; one estimate puts the figure at 97%.[1] Many invertebrate taxa have a greater number and variety of species than the entire subphylum of Vertebrata.[2] Invertebrates vary widely in size, from 50 μm (0.002 in) rotifers[3] to the 9–10 m (30–33 ft) colossal squid.[4]

Some so-called invertebrates, such as the Tunicata and Cephalochordata, are more closely related to vertebrates than to other invertebrates. This makes the invertebrates paraphyletic, so the term has little meaning in taxonomy.

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Wirbellose, Invertebrata (Evertebrata) sind die vielzelligen Tiere ohne Wirbelsäule, also alle Metazoa mit Ausnahme der Wirbeltiere (Vertebrata). Zu dieser informellen Gruppe (Formtaxon) von Lebewesen, die früher in der Wissenschaft auch als Niedere Tiere bezeichnet wurden, gehören die meisten bekannten Tierarten. Der Begriff „Wirbellose“ wurde im frühen 19. Jahrhundert von Jean-Baptiste de Lamarck in Abgrenzung zu den Wirbeltieren eingeführt.

 

https://en.wikipedia.org/wiki/Invertebrate