Barnacle
Concavus concavus
Paleobiology
Concavus concavus
Biceratops nevadensis
Paedeumias clarki
Triarthrus beckii
Triarthrus eatoni
Diacalymene
Eurypterus
Concavus concavus
Concavus concavus
Lithohypoderma ascardides
Kallidecthes richardsoni
Isotelus