The teeth of Changchunsaurus parvus, a minor herbivorous dinosaur from the Cretaceous of China, correspond an of import together with poorly-known phase inwards the evolution of ornithopod dentition, according to a report published inwards the open-access mag PLOS ONE past times Jun Chen of Jilin University inwards China together with colleagues.
 |
| The skull of the holotype specimen of C. parvus (JLUM L0304-j-Zn2) |
[Credit: Chen et al., 2018] Ornithischian ("bird-hipped") dinosaurs developed an incredible diverseness of teeth, including the famously complex dental batteries of derived ornithopods, simply petty is known nigh how these intricate arrangements arose from the unproblematic molar arrangements of early dinosaurs.
Changchunsaurus parvus belongs to an early branch at or close the origins of the ornithopods, together with so may provideinsight into the ancestral Earth of ornithopod molar development. In this study, Chen together with colleagues took sparse sections from 5 jaw bones of Changchunsaurus to investigate molar composition equally good equally how the teeth are maintained throughout the life of the creature using histological techniques.
Among the notable features of Changchunsaurus dentition is a unique method of molar replacement that allowed it to recycle teeth without disrupting the continuous shearing surface formed past times its molar rows. The authors also flora that the teeth characteristic wavy enamel, a tissue type formerly idea to accept evolved exclusively inwards to a greater extent than derived ornithopods. The authors suspect these features may accept arisen early equally this grouping of dinosaurs became specialized for herbivory.
Features of the jaws together with teeth are oftentimes used to assess dinosaur phylogeny. In add-on to investigating the evolution of ornithopod dentition, this report also identifies novel dental traits that mightiness assistance form out ornithischian relationships inwards futurity analyses. But the authors annotation that this is exclusively the starting fourth dimension in-depth report at a dinosaur close the base of operations of the ornithopod work solid unit of measurement tree, together with that to a greater extent than studies on to a greater extent than dinosaurs volition last needed to fill upwards inwards the total painting demo of this group's evolution.
Professor Chen Jun summarizes: "These tissue-level details of the teeth of Changchunsaurus say us that their teeth were well-adapted to their abrasive, plant-based diets. Most surprisingly, the wavy enamel described here, presumably to arrive to a greater extent than resistant to wear, was previously idea to last exclusive to their giant descendants, the duckbilled dinosaurs."
Source: PLOS [November 07, 2018]
Sumber http://archaeologynewsnetwork.blogspot.com
Changchunsaurus parvus belongs to an early branch at or close the origins of the ornithopods, together with so may provideinsight into the ancestral Earth of ornithopod molar development. In this study, Chen together with colleagues took sparse sections from 5 jaw bones of Changchunsaurus to investigate molar composition equally good equally how the teeth are maintained throughout the life of the creature using histological techniques.
 |
| The wavy appearance of the enamel of Changchunsaurus inwards sparse department together with nether cross-polarized light [Credit: Chen et al., 2018] |
Features of the jaws together with teeth are oftentimes used to assess dinosaur phylogeny. In add-on to investigating the evolution of ornithopod dentition, this report also identifies novel dental traits that mightiness assistance form out ornithischian relationships inwards futurity analyses. But the authors annotation that this is exclusively the starting fourth dimension in-depth report at a dinosaur close the base of operations of the ornithopod work solid unit of measurement tree, together with that to a greater extent than studies on to a greater extent than dinosaurs volition last needed to fill upwards inwards the total painting demo of this group's evolution.
Professor Chen Jun summarizes: "These tissue-level details of the teeth of Changchunsaurus say us that their teeth were well-adapted to their abrasive, plant-based diets. Most surprisingly, the wavy enamel described here, presumably to arrive to a greater extent than resistant to wear, was previously idea to last exclusive to their giant descendants, the duckbilled dinosaurs."
Source: PLOS [November 07, 2018]
Sumber http://archaeologynewsnetwork.blogspot.com
Buat lebih berguna, kongsi:
