O1S1T1R1A1C3O1D2E1R1M3S1
17 points
OSTRACODERMS is validvalid
OSTRACODERM, [n]
OSTRACODERM, any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales [n]
OSTRACODERM, [n]
OSTRACODERM, any of the early fossil jawless fishes of the Lower Paleozoic usually having a bony covering of plates or scales [n]