Some members of this phylum breathe using their plated book lungs while other organs are   housed in the hemocoel.
Some members of this phylum breathe using their plated book lungs while other organs are   housed in the hemocoel. This phylum is characterized by, and named for, their jointed legs,  and organisms in this phylum have a (*) segmented body protected by an exoskeleton. The  classes Trilobita and Arachnida fall under, for 10 points, what phylum that includes invertebrates  like crustaceans, spiders and insects?
Some members of this phylum breathe using their plated book lungs while other organs are   housed in the hemocoel.
Arthropoda (accept Arthropods)