protocone वाक्य
उदाहरण वाक्य
मोबाइल
- The fourth upper premolar ( P4 ) has not been recorded, but there is a specimen of its cusps ( protocone, paracone, hypocone, and metacone ) and lophs or crests ( protoloph, mesoloph, metaloph, and posteroloph ), separated by synclines or valleys.
- Based in part on Martin and Rauhut's earlier work on wear facets in australosphenidans, they questioned the presence of a true functional protocone on the upper molars of non-monotreme australosphenidans none of which are known from upper teeth and consequently suggested that australosphenidans may not, after all, have had truly tribosphenic teeth.
- In their paper, Flynn and colleagues described " Ambondro " as the oldest mammal with tribosphenic molars the basic molar type of metatherian ( marsupials and their extinct relatives ) and eutherian ( placentals and their extinct relatives ) mammals, characterized by the protocone cusp on the upper molars contacting the talonid basin on the lower molars in chewing.
- However, there are also differences : there is no entoconid, and an absence of wear seems to suggest that the upper molars ( as yet unknown ) did not have a protocone, and so implying that there was a double origin of tribosphenic teeth, one group represented by the living placentals and marsupials, and the other group being the monotremes bearing'pseudo-tribosphenic'teeth.
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