Related terms:
molt
phyla
lobes
ffffcc
phylum
walcott
cuticle
pygidium
opabinia
annelids
cambrian
silurian
trilobite
ediacaran
lineages
arthropods
trilobites
protostome
whittington
anomalocaris
crustaceans
trace fossils
exoskeleton
smithsonian
early cambrian
middle cambrian
mass extinction
wonderful life
cambrian explosion
last common ancestor
Wikipedia sources:
Burgess Shale
Opabinia
Annelid
Trilobite
Cambrian explosion
Arthropod
Anomalocaris
Stephen Jay Gould
Context for words:
burgess
shale
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