Contact: Diana Kenney
Marine Biological Laboratory
Caption: This is the head of the marine invertebrate amphioxus (Branchiostoma floridae), magnified 15 times. Amphioxus are the most ancient of the chordates (animals whose features include a nerve cord), according to molecular analysis. They are important to the study of the origin of vertebrates.
Credit: Maria del Pilar Gomez/MBL
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