Do all mammals have reallly have tribosphenic design molars?
From wikipedia
What about Tachyglossidaes including the Echidna which seems to have no teeth?
Genus Tachyglossus
T. aculeatus
Genus Zaglossus
Z. attenboroughi
Z. bruijnii
Z. bartoni
Genus †Megalibgwilia
†M. owenii
†M. robusta
Genus †Murrayglossus
†M. hacketti Echidnas (/ɪˈkɪdnəz/), sometimes known as spiny anteaters, are quill-covered monotremes (egg-laying mammals) belonging to the family Tachyglossidae /tækiˈɡlɒsɪdiː/, living in Australia and New Guinea. The four extant species of echidnas and the platypus are the only living mammals that lay eggs and the only...
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name molar derives from Latin, molaris dens, meaning "millstone tooth", from mola, millstone and dens, tooth. Molars show a great deal of diversity in size and shape across the mammal groups. The third molar of humans is sometimes vestigial. In humans, the molar teeth have either four or five cusps. Adult humans have 12 molars, in...
[QUOTE=Jebus H. Christ]
The molars or molar teeth are large, flat teeth at the back of the mouth. They are more developed in mammals. They are used primarily to grind food during chewing. The name molar derives from Latin, molaris dens, meaning "millstone tooth", from mola, millstone and dens, tooth. Molars show a great deal of diversity in size and shape across the mammal groups. The third molar of humans is sometimes vestigial. In humans, the molar teeth have either four or five cusps. Adult humans have 12 molars, in...
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This is the link you want: Molar (tooth) - Wikipedia
It’s also the link from which your quote was taken.
You owe me one.
[QUOTE=Jebus H. Christ]
The tribospehnic design is thought to be primitive (i.e., plesiomorphic) in mammals, but has been modified by various lineages. You can see all manner of variations in molar structure here .
[QUOTE=John Mace]Molar (tooth) - Wikipedia
It’s also the link from which your quote was taken.
You owe me one.
Thanks.
Another mammal question:
Deep in their bones, all mammals are related. The earliest known mammals were the morganucodontids, tiny shrew-size creatures that lived in the shadows of the dinosaurs 210 million years ago. They were one of several different mammal lineages that emerged around that time. All living mammals today, including us, descend from the one line that survived.
Were morganucodontids the line that survived?
[QUOTE=Jebus H. Christ]
Were morganucodontids the line that survived?
That is from National Geographic.
http://magma.nationalgeographic.com/ngm/0304/feature1/index.html?fs=www7.nationalgeographic.com
[QUOTE=Jebus H. Christ]
Nope. They only lasted through about the middle of the Jurassic. The sister clade to Morganucidontidae split into Docodonta and Symmetridonta; the latter lineage is the one that survived to produce cats and rats and elephants.
[QUOTE=Darwin’s Finch]
No unicorns?
