BIOL 1541L Chapter Notes - Chapter 32: Interventricular Septum, Body Hair, Air Sacs
6 Apr 2017
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Phylogenetic tree of chordates: each of the innovations listed is an evolutionary trend shared by the classes beyond the branch point. Lanceletes (subphylum cephalochordata): belong to one genus, branchiostoma, Found in shallow water along most coasts, where they lie buried in sandy or muddy substrates with only their anterior mouth and gill apparatus exposed. They feed on microscopic particles ltered out of a constant stream of water that enters the mouth and exits through the gill slits. Vertebrates have the characteristics of a chordate. Vetebral column is part of the exible but strong jointed endoskeleton. Skeletons protects the internal organs and serves as a place of attachment for muscles. The skeleton and muscles form a system that permits rapid, and a more ef cient movement. Pectoral and pelvic ns of shes evolved into the jointed appendages that allowed vertebrates to move onto land.
