tribosphenic वाक्य
उदाहरण वाक्य
मोबाइल
- This mammal species is known only from this fragmentary tribosphenic teeth.
- The tribosphenic design appears primitively in all groups of mammals.
- The new mammal has " pseudo-tribosphenic " teeth.
- From the primitive tribosphenic tooth, molars have diversified into several unique morphologies.
- Metatherians belong to a subgroup of the northern tribosphenic mammal clade or Boreosphenida.
- Another fragmentary tooth, UA 8699, is recognizable as a tribosphenic lower molar.
- These mammals possessed tritubercular lower molars and these were not tribosphenic and were quite primitive.
- The tribosphenic tooth is found in insectivores and young platypuses ( adults have no teeth ).
- Early creodonts ( both oxyaenids and hyaenodontids ) displayed the tribosphenic molars common for basal therians.
- It is believed to be 167 million years old, or 25 million years older than all previous tribosphenic fossils.
- In modern tribosphenic molars, the trigonid is towards the front of the jaw and the talonid towards the rear.
- The molars " bear striking resemblance to the tribosphenic pattern characteristic of living therians . . . " ( Pascual ).
- The earliest marsupial and placental mammals and their kin all had tribosphenic teeth capable not only of cutting, but also grinding.
- The design that is considered one of the most important characteristics of mammals is a three-cusped shape called a tribosphenic molar.
- However, the pseudo-tribosphenic molars from the new fossil shows that similar structures to combine cutting and grinding had evolved several times.
- The p4 and molars have a distinct trigonid ( a triangular group of cusps at the front of a tribosphenic tooth ) and talonid.
- Because tribosphenic teeth are such a unique and intricate structure, paleontologists once believed that there must have been a single origin in the Mesozoic.
- The discovery of " Ambondro " was thought to extend the known temporal range of tribosphenic mammals 25 million years further into the past.
- The scientists said the dual north-south evolution of the advanced tribosphenic teeth occurred after the supercontinent of Pangea split into southern and northern continents about 160 million years ago.
- This is awkward because tribosphenic molars are commonly found in most therian mammals ( there exist some exceptions such as anteaters and some whales, which have no teeth at all ).
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