Vertebrates include many of the animals with which we are familiar. Fish, amphibians, reptiles, birds and mammals are vertebrates. But the vertebrates, as a group, comprise just one group in a larger, more inclusive group, the chordates. This is less familiar, as those chordates that are not vertebrates are not found every day. Invertebrate chordates include the urochordates, or tunicates, colloquially the sea-squirts, marine creatures that generally (but not always) spend their adult lives fixed in one place, as sponges and corals do; and the cephalochordates or lancelets — translucent, vaguely fishlike creatures which although in principle fully mobile throughout life, spend much of the time half-buried in the sand in inshore waters.


Neural Crest Monophyletic Group Nerve Cord Ciliated Band Gill Slit 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Henry Gee 1996

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