___________ is the second largest animal phylum.
Mollusca
By number of described species, Arthropoda is the largest animal phylum and Mollusca ranks second, with roughly 85,000–100,000 living species including snails, bivalves, squids and octopuses. They are characterised by a soft body, mantle, muscular foot and (usually) a calcareous shell.
Chordata ranks third; Annelida (segmented worms) is much smaller. 'Coelomates' is not a phylum but a grade of organisation covering many phyla.
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