Invertebrate World

Invertebrates is an umbrella term describing animals that neither develop nor retain a vertebral column, which evolved from the notochord.

One estimate puts the figure at 97%.

Arthropods, mollusks, annelids

<p>Invertebrates vary widely in size, from 50 μm (0.002 in) rotifers to the 9–10 m (30–33 ft) colossal squid.</p> Signup and view all the answers

<p>Some so-called invertebrates, such as the Tunicata and Cephalochordata, are actually sister chordate subphyla to Vertebrata, being more closely related to vertebrates than to other invertebrates.</p> Signup and view all the answers