BIO 474 Study Guide - Comprehensive Final Exam Guide - Muscle, Bone, Skin
Document Summary
Early group of fish with mineralized tissue, notochord, cranium, but lacked pharyngeal slits. The efficiency of the vertebrate kidney at removing water from the body points to vertebrate life originating in freshwater where there was an abundance of water. On the other hand, the earliest vertebrate fossils are found exclusively in marine environments. Paraphyletic group of jawless extant vertebrates without reproductive ducts who reproduce externally. Essentially the only extant agnathans who are found at 1% males in a population (possibly hermaphroditic). They lack jaws, vertebra, external armor, are found worldwide (except for polar waters) \, and feed as scavengers. Range refers to the distance an individual will travel while distribution refers to the regions in which a species can be found. Have small simple vertebrae, feed as parasites by drinking blood, have well-developed kidneys to allow them to reproduce in freshwater (making them anadromous), and are sedentary filter-feeders as larvae.
