Bio 204 Lab 15
1. 8 apomorphies of Mammalia: mammary glands, muscular thoracic diaphragm, midle ear with three
bones, hair, heterodont dentition, single jaw bone, endothermy, four chambered heart with left aortic arch.
2. endothermy: body heat generated internally by metabolism of food
3. ectothermy: body heat obtained from the environment
4. heterodont dentition: individuals possess different sizes and shapes of teeth
5. why isn't egg laying an apomorphy of monotremes?: because other vertebrates like
turtles, lizards, snakes and birds lay eggs also
6. Four tooth types in mammals?: incisors, canines, premolars, molars
7. Marsupialia apomorphy?: marsupium and choriovitelline placenta
8. Eutheria apomorphy: corpus collasum and chorioallantoic placenta
9. mammalian tetrapods jaw bone?: single bone in lower jaw
10. middle ear bones?: malleus, stapes, incus
1. 8 apomorphies of Mammalia: mammary glands, muscular thoracic diaphragm, midle ear with three
bones, hair, heterodont dentition, single jaw bone, endothermy, four chambered heart with left aortic arch.
2. endothermy: body heat generated internally by metabolism of food
3. ectothermy: body heat obtained from the environment
4. heterodont dentition: individuals possess different sizes and shapes of teeth
5. why isn't egg laying an apomorphy of monotremes?: because other vertebrates like
turtles, lizards, snakes and birds lay eggs also
6. Four tooth types in mammals?: incisors, canines, premolars, molars
7. Marsupialia apomorphy?: marsupium and choriovitelline placenta
8. Eutheria apomorphy: corpus collasum and chorioallantoic placenta
9. mammalian tetrapods jaw bone?: single bone in lower jaw
10. middle ear bones?: malleus, stapes, incus
