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MONOTREMATA: 'COS SOMETIMES A MAMMAL JUS' GOTTA LAY EGGS

The monotremes are regarded as the most primitive group of mammals, and are today represented by the iconic duck-billed platypus and the various species of echidna.

 
Monotremata
†Kryoryctes cadburyi
122 Mya
 
Animal picture.
Monotremata | Kollikodontidae
†Kollikodon ritchiei
99.6 Mya
 
Monotremata | Ornithorhynchidae
†Teinolophus trusleri
122 Mya
 
Animal picture.
Monotremata | Ornithorhynchidae
†Steropodon galmani
99.6 Mya
 
Animal picture.
Monotremata | Ornithorhynchidae
†Monotrematum sudamericanum
66.0 Mya
 
Animal picture.
Monotremata | Ornithorhynchidae
†Obdurodon spp.
28.4-5.33 Mya
 
Animal picture.
Monotremata | Ornithorhynchidae
Ornithorhynchus anatinus
duck-billed platypus
 
Animal picture.
Monotremata | Tachyglossidae
†Megalibgwilia spp.
5.33-2.59 Mya
 
Animal picture.
Monotremata | Tachyglossidae
†Murrayglossus hacketti
Hackett's giant echidna
2.59 Mya
 
Monotremata | Tachyglossidae
†Zaglossus robustus
5.33-2.59 Mya
 
Animal picture.
Monotremata | Tachyglossidae
Zaglossus bruijnii
western long-beaked echidna
 
Animal picture.
Monotremata | Tachyglossidae
Zaglossus attenboroughi
Sir David's long-beaked echidna
 
Animal picture.
Monotremata | Tachyglossidae
Zaglossus bartoni
eastern long-beaked echidna
 
Animal picture.
Monotremata | Tachyglossidae
Tachyglossus aculeatus
short-beaked echidna
Sir Graham