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Chor003b.gif Pikia - Pikia, a possible ancestor to the chordates. Found in the Burgess shales.

CHOR002B.GIF Evolution of the chordate lineage.

CHOR001B.GIF Components of the notocord

cepl013b.gif Cephalochordata - Branchiostoma - Main blood vessels of the lancelet Amphixous.

AGNA037P.GIF Agnatha - Petromyzon marinus - Ammocoete larval stage of the lamprey showing the middle region of the body with gill bars visible.

AGNA036P.GIF Agnatha - Petromyzon marinus - Ammocoete larval stage of the lamprey showing the anterior region of the body with structures associated with the head visible.

AGNA035P.GIF Agnatha - Petromyzon marinus - Ammocoete larval stage of the lamprey showing the middle region of the body with gill bars visible..

AGNA034P.GIF Agnatha - Petromyzon marinus - Ammocoete larval stage of the lamprey showing the middle region of the body with notochord, muscle and alimentary tract all visible.

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