the root (no rank)
Eukaryota (domain)
Metazoa (kingdom)
Mollusca (phylum)
Bivalvia (class)
Pteriomorphia (subclass)
Ostreoida (order)
Ostreidae (family)
oysters (common name)
[hide inferior taxa]
Crassostrea (genus)
Crussdstrea grigus (species)
Ostrea (genus)