These are animals which at some stage in their life-cycle having had a notochord or spinal column, gill-slits, and post-anal tail. It includes humans and other vertebrates.  There are 14 classes, often in three subphyla: Subphylum Cephalochordata1 — Lancelets Class Leptocardii — Lancelets Subphylum Tunicata1 — Tunicates Class Appendicularia — Pelagic Tunicates Class Ascidiacea — Sea … Continue reading "Phylum Chordata"

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