Search the Community
Showing results for tags 'evolution'.
-
So last year my friend Jared Voris named both Thanatotheristes degrootorum and Daspletosaurini (as you all probably know). For the past year a few others and I been studying this clade (you probably all know as well) and have been able to put up a good argument for two unnamed and controversial Daspletosaurus species, one from the Dinosaur Park Formation of Alberta and the other from the Judith River Formation of Montana. This presents that there’s most likely 4 Daspletosaurus species, there’s also been evidence of a possible (note possible, just kind of a guess based of age and location) Th
- 20 replies
-
- 3
-
-
-
- anagenetic
- evolution
- (and 3 more)
-
At work, I study convergent antibody evolution in response to COVID vaccination. When you have a chisel everything around you is shale, so during my internet endeavors in paleontology, I find a lot of questions coming up for me about trilobite convergent evolution, particularly between the Moroccan and North American species with which I am most familiar. This thread will be a few different posts of species which have really stood out to me as similar, and I would be delighted if others shared their own observations! For a little background which got me thinking on the topic- I'm
- 6 replies
-
- 1
-
-
- morphology
- evolution
- (and 1 more)
-
Help (or viability) on translating lineages into cladograms
Macrophyseter posted a topic in Questions & Answers
When it comes to evolutionary lineages that tend to be represented by flow charts, would it be viable to also represent/reorganize them into hypothetical cladograms? Considering that flow charts continue to be used for certain lineages (i.e. Lamnidae), I am feeling the possibility that there might be something that makes the interpretation of such charts incompatible with cladograms. For example, below are evolutionary lineages for Isurus and Carcharodon per Heim (1996) and Canevet & Lebrun (2018) (left and right respectively) that I translated into possible cladograms. If this- 28 replies
-
- 1
-
-
- lineage
- anacladogenesis
- (and 5 more)
-
Hi, i'm preparing an article for Aturia, the paleontological revue of my club about how and when teeth appeared and their evolution. I've found some articles about it : https://www.nature.com/articles/nature11555 ; https://doi.org/10.1101/2020.07.08.193839 ; https://www.diva-portal.org/smash/get/diva2:1076188/FULLTEXT01.pdf. I'm looking for other papers that could help me for that work so i ask your help. @Troodon @Harry Pristis @Al Dente ? Cheers, Sophie.
-
No modern phylogenetic analyses for extinct lamniformes?
Macrophyseter posted a topic in Questions & Answers
Taxonomic debate over extinct lamniformes remains a big thing, but I've noticed that it seems like there hasn't been any studies that use modern phylogenetic techniques (i.e. maximum parsimony) to resolve issues with extinct taxa (i.e. Carcharodon, Isurus, Macrorhizodus, Otodus). Is there a reason for this absence, or perhaps I simply have not come across one that already exists? I suppose it's possible that dental characteristics alone as character codes for a phylogenetic matrix may not be viable... -
Earth's mountains disappeared for a billion years, and then life stopped evolving
Oxytropidoceras posted a topic in Fossil News
Earth's mountains disappeared for a billion years, and then life stopped evolving A dead supercontinent may be to blame By Brandon Specktor, Live Science Tang, M., Chu, X., Hao, J. and Shen, B., 2021. Orogenic quiescence in Earth’s middle age. Science, 371(6530), pp.728-731. Yorus, Paul H. -
For those with an interest in hominin paleontology this article describes the discovery of a significant find, a Paranthropus robustus skull. https://www.bbc.com/news/world-australia-54882214 Here is a link to the actual paper in Nature Ecology and Evolution (paywalled). https://www.nature.com/articles/s41559-020-01319-6
- 1 reply
-
- 3
-
-
- hominid
- paranthropus
- (and 1 more)
-
https://www.nature.com/articles/d41586-020-02985-z
- 1 reply
-
- 2
-
-
- fractofusus
- yilingia spiciformis
- (and 3 more)
-
https://phys.org/news/2020-10-giant-lizards-learnt-millions-years.html?fbclid=IwAR1QVtoiNraBjhR0co0ae7Ajt9UxfBkjtIqwrLQMYhmCEr_XQlqFN5pW4VE Scientific journal: 150 million years of sustained increase in pterosaur flight efficiency, Nature (2020). DOI: 10.1038/s41586-020-2858-8 , www.nature.com/articles/s41586-020-2858-8
-
- 2
-
-
- pterodactyls
- pterosaurs
- (and 1 more)
-
Back in May or so I got my hands on some micromatrix from the Harding Sandstone, CO, USA. This formation dates back to the Ordovician: ~450-475 mya. It's chock full of some really cool and important fossils. It has some of the earliest vertebrate material, and some of the earliest steps in the evolution of teeth! I hope this is an informative and fun look into an important period in life's history. If you feel I have mischaracterized something or have left out pertinent information, please do speak up! I do also plan to post more pictures as I sort through material. If there's something specif
- 11 replies
-
- 4
-
-
- odontodes
- eryptichius
- (and 7 more)
-
300-million-year-old fish resembles a sturgeon but took a different evolutionary path
Darbi posted a topic in Fossil News
https://phys.org/news/2020-06-million-year-old-fish-resembles-sturgeon-evolutionary.html?fbclid=IwAR3FE_g9MI_kaL_Nc25IdxqjMQ3F2cfBCq33zml_J4gRkPMkh8nPecNsYjw Jack Stack et al, Tanyrhinichthys mcallisteri, a long-rostrumed Pennsylvanian ray-finned fish (Actinopterygii) and the simultaneous appearance of novel ecomorphologies in Late Palaeozoic fishes, Zoological Journal of the Linnean Society (2020). DOI: 10.1093/zoolinnean/zlaa044 -
https://phys.org/news/2020-06-microfossil-spectroscopy-dates-earth-animals.html?fbclid=IwAR15tVkP0pUuvoyi-8ByQN2_GC-wRxUSND-0xkRdv5meV0zwY16MbPNGiqo Ross P. Anderson et al. Aluminosilicate haloes preserve complex life approximately 800 million years ago, Interface Focus (2020). DOI: 10.1098/rsfs.2020.0011
-
I have finally managed to persuade a teacher to let me do an at least slightly paleontological essay so i'm really happy, however the topic i'm doing is quite broad but i do have 1.5k words to summarise it in, i would like briefly outline the key crossroads in the evolutionary lineage of humans, i have shortened these to: Sarcopterygii-tetrapods , reptile to mammal, 4 legged to 2 legged , i would appreciate any opinions on this and any literature that anyone knew would be helpful, thanks again, will
-
Just watched fascinating documentary on equid evolution- bout half on the origin (Dawn horse), then progresses to present-day..........Bone
-
I am new to collecting meg teeth so I hope my question is not “dumb.” Are the tooth cusps on a C. chubutensis vestigial structures from the earlier three pronged tooth like on O. obliquus? I read a physics article about how the megs tooth serration evolves from the smaller prong teeth getting sharks caught on larger prey causing them damage. Did the improved serration as the sharks evolved to be larger lead adult C. megladon adults not having cusps at all? I hope the question makes sense.
-
A new large Late Cretaceous lamniform shark from North America, with comments on the taxonomy, paleoecology, and evolution of the genus Cretodus Kenshu Shimada &Michael J. Everhart Article: e1673399 | Received 30 Nov 2018, Accepted 09 Sep 2019, Published online: 18 Nov 2019 LINK (description of Cretodus houghtonorum n.sp) edit:5,30 MB,or thereabouts relevant: Philosophical Transactions of the Royal Society of London. Series B, Containing Papers of a Biological Character Vol. 210 (1921), pp. 311-407 V I I I .— On the Calcificati
-
- 4
-
-
- vertebrae
- axial skeleton
- (and 19 more)
-
I keep thinking I must just be stupidly forgetting/overlooking something, but I haven’t been able to come up with it in a long time. There were birds during the Mesozoic(hesperonis, for example), long before theropods evolved into birds(after the Mesozoic, right? I thought all the already very bird-like Dino’s, like archaeopteryx, dead-ended at the end of the Mesozoic)....what am I missing, here? I’ve been looking at bird evolutionary charts, and none of them seem to make sense of that. I’m not all that learned on this topic, but there are things I at least THOUGHT I knew about it, but I’
-
A new normal: Study explains universal pattern in fossil record, Santa Fe Institute, June 26, 2019 https://www.sciencedaily.com/releases/2019/06/190626160341.htm http://www.terradaily.com/reports/A_new_normal_Study_explains_universal_pattern_in_fossil_record_999.html https://www.eurekalert.org/pub_releases/2019-06/sfi-ann061919.php The paper is: Rominger, A.J., Fuentes, M.A. and Marquet, P.A., 2019. Nonequilibrium evolution of volatility in origination and extinction explains fat-tailed fluctuations in Phanerozoic biodiversity. Sci
- 1 reply
-
- 2
-
-
- nonequilibrium statistical physics
- evolution
- (and 3 more)
-
.jpg.0198441a1d1e8e7cef2c0382e220959f.thumb.jpg.55549b8fb364714d6637221084217c4f.jpg)
Natural History Museum Maastricht: Exhibition "Whale: Locality Maastricht"
ziggycardon posted a topic in A Trip to the Museum
Hi! I made a small visit to the Natural History Museum in Maastricht today to visit the new small exhibition named "Whale: Locality Maastricht" which centers around some Eocene whale bones from an undescribed whale found in the ENCI quarry in Maastricht. The exhibition explores further into the evolution of whales, it's a small exhibition but worth a visit if you haven't seen the museum or if you are really interested in whale evolution. Should any of our Dutch, Belgian & German members decide to visit (or international members who are in the area), then you sho- 9 replies
-
- 5
-
-
- natural history
- museum
- (and 9 more)
-
Hello, I'm looking for a book to understand the evolutions of the birds, something easy to understand. I've found 3 books, anyone here ever read these books? https://www.amazon.com/Feathered-Dinosaurs-Origin-John-Long/dp/0195372662/ref=sr_1_16?keywords=evolution+of+the+birds&qid=1558129346&s=gateway&sr=8-16 https://www.amazon.com/Flying-Dinosaurs-Fearsome-Reptiles-Became/dp/0231171781/ref=sr_1_1?keywords=evolution+of+the+birds&qid=1558129346&s=gateway&sr=8-1 https://www.amazon.com/gp/product/1421415909/ref=dbs_a_def_rwt_hsch_vapi_taft_p
-
Chicken Evolution and Broiler Chicken as A Future Index Fossil
Oxytropidoceras posted a topic in Fossil News
The Evolution of the Chicken. Mark Berres. 2018.02.28 Wednesday Nite @ The Lab Published on Mar 1, 2018 https://www.youtube.com/watch?v=hXL2doMXWfg A related paper is: Bennett, C.E., Thomas, R., Williams, M., Zalasiewicz, J., Edgeworth, M., Miller, H., Coles, B., Foster, A., Burton, E.J. and Marume, U., 2018. The broiler chicken as a signal of a human reconfigured biosphere. Royal Society open science, 5(12), p.180325. https://royalsocietypublishing.org/doi/10.1098/rsos.180325 Some news article are: -
Fossil dino bones predate fossil dino eggs by over 100 million years? Wow. New studies of some of the earliest dino eggs shed light on egg evolution. https://www.google.com/amp/s/phys.org/news/2019-03-world-oldest-eggs-reveal-dinosaur.amp
-
Bored? Read a book! here you can download books about fossils for free. On this web site https://epdf.tips/ you can download many interesting books about fossils.Search for "fossils", "cambrian" or other keywords and you can get a whole bunch of pdfs (just as an example these titles): Evolution of Fossil Ecosystems Paleogene Fossil Birds Fossil Atlas Fishes Chinese Fossil Vertebrates Discovering Fossil Fishes Fossil Behavior Compendium Trace Fossil Analysis Fossil Sharks, a pictorial review Paleobiology and the Fossil record Paleobot
- 8 replies
-
- 14
-
-
- fishes
- vertebrates
- (and 7 more)
-
Multiple episodes of rapid evolutionary change may have been linked to climate and oxygen changes from 571 mya on. https://m.phys.org/news/2019-03-ancient-prompt-rethink-animal-evolution.html
-
Below is an example of how weird and rapid evolution can be. I have to wonder how often this has happened in the past and how invisible it would beto a paleontologist with nothing but hard parts as fossils and the lack of temporal resolution in the geologic record. This Mutant Crayfish Clones Itself, and It’s Taking Over Europe Carl Zimmer. New York Times, Feb. 2018 https://www.nytimes.com/2018/02/05/science/mutant-crayfish-clones-europe.html Decoding the mutant, all-female, self-cloning crayfish Kevin Bersett, University of Illinois, Sept
- 4 replies
-
- 5
-
-
- marbled crayfish
- crayfish
- (and 2 more)
