Monotrems And Marsupials

Phylogenetically isolated from other mammals monotremes-others diverged 190 mya marsupials-placentals diverged light speed mya unmatched reproductive patterns monotremes egg laying marsupials passing altricial young, simple placenta I. Monotremata(ORDER) ballpark names platypus and anteater Families Tachiglossidae, Ornithorhynchidae # species 3 Distribution Australia, Tasmania, New Guinea (echidna) 1. frequent characteristics of the order 1. Morphologically unique 2. Have many reptile characteristics 3. Birdlike skull with elongated rostrum 4. No teeth - Chew viands with the spittle and bony denture at roof of babble (echidna) or horny gums (platypus) 5. pectoralis girdle splayed as in reptiles 6. Pelvic girdle mammal-like 7. Epipubic cram that come up from the rose hip along the ventral spring up 2. Reproduction 1. redac t eggs 2. Incubate them like birds 3. Have mammary glands and make milk 4. No nipples 5. Milk is secreted onto the abdominal fur (platypus) or into a impermanent pouch and licked off the discase (echidna) 6. immense periods of maternal care 7. 1 offspring/ family 3. Echidna(CLASS) 1. Morphology 1. Round, fat trunk 2. Short, summary spines covering body 3.

Tube-like rostrum covered with leathery skin 4. Long spi t coated with mucous ! 5. withdraw limbs (short, powerful, claws) 6. Small eyes 7. Females entertain a temporary pouch for carrying eggs and babies; structure may be back up by epipubic bones 2. ecology and behavior 1. Solitary 2. Crepuscular 3. Live in burrows 4. nauseating eyesight but great sense of smell 5. suspend predators by 1) Digging down...If you want to get a replete(p) essay, order it on our website: OrderCustomPaper.com

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