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extensively. This caused wear to their teeth, which ground down quickly. The teeth were not only lying next to each other but were also stacked one above the other within the jawbone to form vertical tooth rows. So there were quite a lot of teeth in one jaw and all the densely packed teeth together are referred to as ‘tooth battery’. In the jaw that is shown above, many unworn, keeled, diamond-shaped surfaces of the stacked teeth are visible. Furthermore, the teeth erupted in a way that there was more than one tooth functional in each vertical row: The teeth rotated during their lifetime around the long axis of the jaw so that a new tooth first reached the mouth cavity on the inner side of the jaw, yet before the older tooth or teeth, sitting closer to the cheek, were entirely worn down. The tooth wear acting on the surfaces of about one hundred functional teeth formed an inclined chewing surface on each tooth battery. In the image above the chewing or wear surface is
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Edmontosaurs belong to the so-called duck-billed dinosaurs (hadrosaurs), and were exceptionally numerous in Latest
Cretaceous times throughout upper North America. As herbivores, they ripped leaves and plants using their bills, and then, unlike reptiles usually do, chewed the leaves and stems
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for comparison). Only the inner edge of the chewing surface, running along the top of the inner surface of the tooth battery, with the keels forming conspicious spikes, is discernible.
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at the Museum of the
Rockies in Bozeman, Montana, seen from the inner side (i.e. from the tongue side). It is not clear where this specimen was collected.
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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Edmontosaurus jaw from above showing rows of inner teeth - Museum of the
Rockies - 2013-07-08
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visible because in the mandible it faces toward the cheek, not toward the tongue (but see
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Add a one-line explanation of what this file represents
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Flash fired, strobe return light detected, auto mode
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https://www.flickr.com/photos/timevanson/9325346202/
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Commons is a freely licensed media file repository.
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Commons Attribution-ShareAlike 2.0 Generic
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1108:Template:Did you know nominations/Dental battery
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182:
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149:
147:
119:You can help
109:
77:
22:File history
1620:IIM version
1465:File source
1448:Color space
1390:0.94 meters
1327:Not defined
1282:Orientation
1226:NIKON D5100
1161:Эдмонтозавр
815:instance of
653:Nikon D5100
618:8 July 2013
547:copyrighted
441:Tim Evanson
276:share alike
270:attribution
203:Tim Evanson
141:Description
1553:Saturation
1473:Scene type
1069:File usage
1022:Dimensions
988:9325346202
953:image/jpeg
938:media type
831:photograph
761:millimetre
408:some value
162:this image
85:image/jpeg
27:File usage
1588:Lens used
1563:Sharpness
1253:ISO speed
1048:(2.42 MB)
1019:Thumbnail
1016:Date/Time
781:ISO speed
603:inception
213:Licensing
1543:Contrast
1529:Standard
1364:4.970854
1356:5.906891
1243:F-number
1199:Metadata
895:operator
710:f-number
352:Captions
332:reviewer
259:to remix
253:to share
244:license.
191:FunkMonk
37:Metadata
1583:3563291
1575:Unknown
1408:Unknown
1400:Pattern
1335:version
1301:240 dpi
1293:240 dpi
1033:current
1028:Comment
393:creator
376:depicts
356:English
133:Summary
81:
1567:Normal
1557:Normal
1547:Normal
1285:Normal
1255:rating
902:Flickr
690:second
492:Flickr
321:Flickr
199:Author
179:Source
1623:3,012
1521:82 mm
1510:ratio
1414:Flash
1277:55 mm
1271:Lens
1258:3,200
1247:f/5.6
796:3,200
1338:2.21
1333:Exif
1146:Tand
1025:User
301:true
298:true
169:Date
17:File
910:URL
759:55
725:5.6
448:URL
330:or
158:not
1442:90
1434:90
1426:90
913::
898::
883::
508::
451::
438::
423::
68:|
64:|
60:|
56:|
50:.
1599:0
1513:1
1374:0
121:.
87:)
72:.
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
