Monotrems And Marsupials

Phylogenetically isolated from some other mammals monotremes-others diverged 190 mya marsupials-placentals diverged 100 mya nonpareil reproductive patterns monotremes egg laying marsupials extremely altricial young, simple placenta I. Monotremata(ORDER) ballpark names platypus and echidna Families Tachiglossidae, Ornithorhynchidae # species 3 distribution Australia, Tasmania, New Guinea (echidna) 1. frequent characteristics of the order 1. Morphologically unique 2. Have more reptilian characteristics 3. Birdlike skull with elongated snout 4. No teeth - Chew fodder with the spittle and bony dental plate at roof of back talk (echidna) or horny gums (platypus) 5. pectoral medallion girdle splayed as in reptiles 6. Pelvic girdle mammal-like 7. Epipubic trick up that come up from the pelvic girdle along the ventral shrink up 2. Reproduction 1. Lay ballock 2. enshroud them like birds 3. Have mammary glands and dispatch milk 4. No nipples 5. draw is secreted onto the abdominal fur (platypus) or into a impermanent discharge and licked off the disrobe (echidna) 6. immense periods of maternal care 7. 1 offspring/year 3. Echidna(CLASS) 1. Morphology 1. Round, robust body 2. Short, summary spines covering body 3.

Tube-like rostrum covered with leathery skin 4. yen tongue coated with mucous 5. pull in ones horns limbs (short, powerful, claws) 6. Small eyes 7. Females have 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. personify in burrows 4. slimy beholding but great signified of smell 5. Avoid predators by 1) Digging down...If you requisite to get a salutary essay, order it on our website: Orderessay

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