Class Trilobita

Elrathia ( )

Cryptolithus ( )

Flexicalymene( )

Phacops( )

Agnostus ( )

Paradoxides ( )

Olenellus ( )

Class Merostomata

Subclass Xiphosura

Limulus ( )

Superclass Crustacea

Class Cirripedia

Balanus ( )

Class Ostracoda

Leperditia ( )

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