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bizarre, prehistoric ratfish chomped prey with buzzsaw jaws
fish
bite
buzzsaw
fossil
fossils
helicoprion
jaw
paleontology
paleozoic
permian
ratfish
science
shark
sharks
source
did microbes cause the earth's most devastating mass extinction?
extinction
extinction events
geology
great dying
mass extinction
methanosarcina
microbes
paleontology
permian
permian-triassic extinction
science
science fiction
source
sail-backed dimetrodon had a nasty bite
dimetrodon
evolution
fossils
mammals
paleontology
permian
science
serrated
synapsid
teeth
vertebrate
ziphodont
source
nature
the tet zoo guide to mesosaurs
evolution
herpetology
mesosaurs
paleobiology
permian
reptiles
info
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