Monotrems And Marsupials

Phylogenetically isolated from other mammals monotremes-others diverged 190 mya marsupials-placentals diverged hundred mya unmatched reproductive patterns monotremes egg laying marsupials extremely altricial young, simple placenta I. Monotremata(ORDER) ballpark names platypus and numbat Families Tachiglossidae, Ornithorhynchidae # species 3 Distribution Australia, Tasmania, New Guinea (echidna) 1. public characteristics of the order 1. Morphologically unique 2. Have many reptile characteristics 3. Birdlike skull with elongated rostrum 4. No teeth - Chew feed with the spittle and bony denture at roof of mouthpiece (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 hip joint along the ventral spring up 2. Reproduction 1. coiffe e ggs 2. Incubate them like birds 3. Have mammary glands and pip milk 4. No nipples 5. Milk is secreted onto the abdominal fur (platypus) or into a impermanent pouch and licked off the whittle (echidna) 6. immense periods of maternal care 7. 1 offspring/ category 3. Echidna(CLASS) 1. Morphology 1. Round, fat consistence 2. Short, summary spines covering body 3.

Tube-like rostrum covered with leathery skin 4. Long spittle coated with mucous ! 5. withdraw limbs (short, powerful, claws) 6. Small eyes 7. Females construct 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. worthless eyesight but great sense of smell 5. fend off predators by 1) Digging down...If you want to get a fully essay, order it on our website: OrderCustomPaper.com

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