How many Chordata species are there?

Question

anonymous · Answer

Lots! Even the number that we know about is huge, and then there are lots more that we haven't discovered yet. I don't know precisely what that number is, but... you could get a rough idea by just going to Wikipedia and adding up the numbers given.

anonymous · Answer

Cephalochordata 
Cephalochordata (lancelets)
Tunicata (Urochordata)
Vertebrata, such as :
Amphibia (frogs, salamanders)
Aves (birds)
Cephalaspidomorphi (Lampreys)
Chondrichthyes (cartilaginous fish)
Mammalia (mammals)
Myxini (Hagfish)
Osteichthyes (bony fish)
Reptilia (crocodiles, snakes, turtles)

anonymous · Answer

anyone know an exact number?

blues · Answer

To Calliope's answer I can't add except to say that it is a good one. Sorry.