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Agnostid
Cambrian to Ordovician
Ptychopariids
Elrathia kingi
Middle Cambrian
Redlichiids
Olenellus
Low to mid Cambrian
Redlichiids
Paradoxies
Middle Cambrian
Trinucleids
Cryptolithus
Upper Ordovician
Trinucleids
Trinucleus
Middle Ordovician
Phacopids
Phacops
Devonian
Phacopids
Flexicalymene
Ordovician
Rusophycus
Cruziana
Chelicerates
Eurypterids
Silurian
Chelicerates
Horseshoe crabs
Early Ordovician
Mortichnia
Ostracodes
Leperdita
Freshwater
Barnacles
Ordovician to recent
Hermit crab
Jurassic
Ghost Shrimp
Callianassa
Ophiomorpha
lagoon/beach/foreshore
Thalassinoides
ghost crab
psilonichus