Willmer, P. G. (Patricia Gillian), 1953- <br/><br/>
Invertebrata relationships :  patterns in animal evolution / 
Pat Willmer 
 - Cambridge :  Cambridge University Press,  1990. 
 - 400 p. :  ill. ;  25 cm. 
<br/><br/>Includes index and references : p. 363-383. 
<br/><br/><label>ISBN: </label>0521330645 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Invertebrates--Evolution.<br/>Invertebrates, Fossil.