Monotrems And Marsupials

Phylogenetically isolated from other mammals monotremes-others diverged 190 mya marsupials-placentals diverged blow mya unmatched reproductive patterns monotremes egg laying marsupials passing altricial young, simple placenta I. Monotremata(ORDER) ballpark names platypus and aardvark Families Tachiglossidae, Ornithorhynchidae # species 3 Distribution Australia, Tasmania, New Guinea (echidna) 1. wonted(a) characteristics of the order 1. Morphologically unique 2. Have many reptilian characteristics 3. Birdlike skull with elongated rostrum 4. No teeth - Chew regimen with the spittle and bony denture at roof of mouth (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 pelvic arch along the ventral spring up 2. Reproduction 1. disgra ce eggs 2. Incubate them like birds 3. Have mammary glands and release milk 4. No nipples 5. Milk is secreted onto the abdominal fur (platypus) or into a impermanent pouch and licked off the flake off (echidna) 6. immense periods of maternal care 7. 1 offspring/ grade 3. Echidna(CLASS) 1. Morphology 1. Round, fat ashes 2. Short, summary spines covering body 3.

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

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