AGRC1020 Lecture Notes - Lecture 11: Dorsal Nerve Cord, Lancelet, Filter Feeder
6 Aug 2018
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Vertebrates are named for vertebrae, the series of bones that make up the vertebral column or backbone. There are about 52,000 species of vertebrates, far fewer than the 1 million insect species on earth. Plant-eating dinosaurs, at 40,000 kg, were the heaviest animals to walk on land. The biggest animal that ever existed is the blue whale, at. This group includes other mammals, birds, lizards, snakes, turtles, amphibians, and the various classes of fishes. Concept 34. 1 chordates have a notochord and a. The vertebrates belong to one of the two major phyla in the. The phylum chordata includes three subphyla, the vertebrates and two phyla of invertebrates the urochordates and the cephalochordates. Although chordates vary widely in appearance, all share the presence of four anatomical structures at some point in their lifetime. These chordate characteristics are a notochord; a dorsal, hollow nerve cord; pharyngeal slits; and a muscular, post-anal tail.
