EEMB 113 Lecture Notes - Lecture 15: Baleen Whale, Vampire Bat, Wisdom Tooth
30 Nov 2017
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Specifies number and position of teeth on one side (upper/lower) Incisors 3/3, canines 1/1, premolars 4/4, molars 2/3 (3/3, 1/1, 4/4, 2/3)*2=42. 2 or 3 for molar in human because some may have wisdom teeth. To maintain holes in ice and to aid in climbing onto ice. Smaller in females than in males: elephant. As elephant runs out of teeth to replace, they die: narwhale. Hunting for food: mysticeti (baleen whales) Left upper canine modified to measure water temperature and acidity: mysticeti (baleen whales) Use baleen and tongue for filter feeding. Heterodonty: the feature of mammals most related to diversity. Cutting and grinding increase surface area of processed food: more rapid. Heterodonty evolved at least twice(extant mammals versus extinct lineages, maybe even twice in extant mammals) 2 features shared with birds: 4 chambered heart, endothermy. Special physiological processes generate and regulate internal body heat in addition to heat that is a by-product of basic physiology.
