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Monotreme ears and the evolution of mammal jaws

Posted by on August 5th, 2020

Jaw joints, in most vertebrate animals that have them, form between a bone in the head called the quadrate and one in the mandible called the articular. The mandibles (lower jaw bone) of most vertebrates is compound, made up of fused bones, but we mammals are different. ¬†We have lots of different types of teeth[…]

Marsupials are a missing link in vertebrate development

Posted by on February 12th, 2013

Marsupials were popular models for early development in the early 1900s , with classic morphological studies performed by notable embryologists such as J.P. Hill, C.G. Hartman, T.T. Flynn (Errol Flynn’s father) and E. McCrady. These workers were fascinated by the marsupial mode of blastocyst formation, which contrasts starkly with that of eutherians. One key difference[…]