TY  - BOOK
AU  - Willmer,P.G.(Patricia Gillian),1953-
TI  - Invertebrata relationships: patterns in animal evolution 
SN  - 0521330645
PY  - 1990///
CY  - Cambridge
PB  - Cambridge University Press
KW  - Invertebrates
KW  - Evolution
KW  - Invertebrates, Fossil
N1  - Includes index and references : p. 363-383
ER  -