Eurypterids were early aquatic members of this phylum that lived in the Ordovician and Silurian periods.
Eurypterids were early aquatic members of this phylum that lived in the Ordovician and Silurian periods. Some members of this phylum have book lungs, and are usually grouped into the subphylum Chelicerata. The largest members of this phylum were the Meganisoptera, and families in this phylum include (*) Hymenoptera and Lepidoptera. Like molluscs, members of this phylum use hemolymph instead of a closed circulatory system, and s silverfish are part of this phylum. Members of this phylum have chitin exoskeletons, and were also the first to develop complex eyes and flight. Trilobites were ancient members of, for ten points, what phylum of animals that includes insects and arachnids?
Eurypterids were early aquatic members of this phylum that lived in the Ordovician and Silurian periods.
{Arthropoda}