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| Visual Comparisons Thread | |
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| Tweet Topic Started: Jan 7 2012, 01:17 AM (507,228 Views) | |
| maker | Jan 26 2015, 06:16 PM Post #1186 |
Apex Predator
  ![]](http://b2.ifrm.com/28122/87/0/p701956/pipright.png)
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Wild and domestic boar: By Klaus Rassinger und Gerhard Cammerer, Museum Wiesbaden (Own work) [CC BY-SA 3.0 (http://creativecommons.org/licenses/by-sa/3.0)], via Wikimedia Commons |
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| Deleted User | Jan 26 2015, 08:12 PM Post #1187 |
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| The All-seeing Night | Jan 28 2015, 05:08 PM Post #1188 |
You are without honor
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Edited by The All-seeing Night, Jan 28 2015, 05:13 PM.
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| Deleted User | Jan 28 2015, 05:32 PM Post #1189 |
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| The All-seeing Night | Jan 29 2015, 05:31 PM Post #1190 |
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You are without honor
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Edited by The All-seeing Night, Jan 29 2015, 05:41 PM.
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| Deleted User | Jan 30 2015, 05:55 PM Post #1191 |
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| maker | Jan 31 2015, 06:03 PM Post #1192 |
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Apex Predator
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 By User:Piepie Modified by:GeeAlice [GFDL (http://www.gnu.org/copyleft/fdl.html), CC-BY-SA-3.0 (http://creativecommons.org/licenses/by-sa/3.0/) or CC BY-SA 2.5-2.0-1.0 (http://creativecommons.org/licenses/by-sa/2.5-2.0-1.0)], via Wikimedia Commons |
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| Deleted User | Jan 31 2015, 07:29 PM Post #1193 |
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| maker | Feb 7 2015, 07:15 PM Post #1194 |
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Apex Predator
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Malagasy Hippopotamus < Hippopotamus amphibius: Hippopotamus amphibius in Uganda: 
Edited by maker, Feb 7 2015, 07:24 PM.
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| Deleted User | Feb 7 2015, 07:28 PM Post #1195 |
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| Amur | Feb 10 2015, 09:42 AM Post #1196 |
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Heterotrophic Organism
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Sorta
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| maker | Feb 24 2015, 04:30 PM Post #1197 |
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Apex Predator
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Virunga National Park: By Radio Okapi [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons Edited by maker, Feb 24 2015, 07:09 PM.
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| MightyKharza | Apr 21 2015, 03:26 PM Post #1198 |
Omnivore
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T. rex vs Allosaurus 
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| Ausar | Jun 6 2015, 10:09 AM Post #1199 |
Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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Does anyone have any dorsal or ventral views of Borhyaena's skull? If so, could someone make a skull comparison with it and possibly some other mammalian carnivores (proportionate comparisons in particular) with the aforementioned views of the skulls? If anyone ever makes it, then thank you very much.
Edited by Ausar, Jun 6 2015, 10:13 AM.
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| Taipan | Jul 21 2015, 05:42 PM Post #1200 |
Administrator
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Dental lessons from past to present: ultrastructure and composition of teeth from plesiosaurs, dinosaurs, extinct and recent sharks A. Lübke, J. Enax, K. Loza, O. Prymak, P. Gaengler, H.-O. Fabritius, D. Raabec and M. Epple RSC Adv., 2015,5, 61612-61622 Abstract Teeth represent the hardest tissue in vertebrates and appear very early in their evolution as an ancestral character of the Eugnathostomata (true jawed vertebrates). In recent vertebrates, two strategies to form and mineralize the outermost functional layer have persisted. In cartilaginous fish, the enameloid is of ectomesenchymal origin with fluoroapatite as the mineral phase. All other groups form enamel of ectodermal origin using hydroxyapatite as the mineral phase. The high abundance of teeth in the fossil record is ideal to compare structure and composition of teeth from extinct groups with those of their recent successors to elucidate possible evolutionary changes. Here, we studied the chemical composition and the microstructure of the teeth of six extinct shark species, two species of extinct marine reptiles and two dinosaur species using high-resolution chemical and microscopic methods. Although many of the ultrastructural features of fossilized teeth are similar to recent ones (especially for sharks where the ultrastructure basically did not change over millions of years), we found surprising differences in chemical composition. The tooth mineral of all extinct sharks was fluoroapatite in both dentin and enameloid, in sharp contrast to recent sharks where fluoroapatite is only found in enameloid. Unlike extinct sharks, recent sharks use hydroxyapatite as mineral in dentin. Most notably and hitherto unknown, all dinosaur and extinct marine reptile teeth contained fluoroapatite as mineral in dentin and enamel. Our results indicate a drastic change in the tooth mineralization strategy especially for terrestrial vertebrates that must have set in after the cretaceous period. Possibly, this is related to hitherto unconsidered environmental changes that caused unfavourable conditions for the use of fluoroapatite as tooth mineral.  http://pubs.rsc.org/en/Content/ArticleLanding/2015/RA/C5RA11560D#!divAbstract |
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6:05 PM Jul 13
