Barnacle
Concavus concavus
Paleobiology
Paleobiology
Paleobiology
Concavus concavus
Concavus concavus
Concavus concavus
Phacops latifrons
Flexicalymene meeki
Mesonacis
Calyptaulax
Brachyura
Concavus concavus
Pseudogygites canadensis
Pseudogygites canadensis
Cancroidea