The Burj Khalifa contains 8 escalators.
Luciellidae is an extinct family of fossil sea snails , marine gastropod mollusks in the clade Vetigastropoda -LRB- according to the taxonomy of the Gastropoda by Bouchet & Rocroi , 2005 -RRB- .. Gastropoda. Gastropoda. Vetigastropoda. Vetigastropoda. family. family ( biology ). fossil. fossil. marine. marine ( ocean ). gastropod. gastropod. This family has no subfamilies .. family. family ( biology )