Gareth Fraser
@garethjfraser.bsky.social
Evolutionary Developmental Biologist at UF | Interested in the development and regeneration of teeth in fishes, particularly sharks and their relatives.
https://www.fraser-lab.net/
https://www.fraser-lab.net/
Reposted by Gareth Fraser
Our latest: Investigating the morphogenesis and replacement of lamprey toothlets using synchrotron imaging, led by Madleen Grohganz @bristolpalaeo.bsky.social, just out in Journal of Morphology. onlinelibrary.wiley.com/doi/epdf/10....
October 22, 2025 at 8:15 AM
Our latest: Investigating the morphogenesis and replacement of lamprey toothlets using synchrotron imaging, led by Madleen Grohganz @bristolpalaeo.bsky.social, just out in Journal of Morphology. onlinelibrary.wiley.com/doi/epdf/10....
Reposted by Gareth Fraser
Do you like cichlids? Fossils? Fossil cichlids? Would you like to study them as part of a graduate degree at the University of Michigan, joining an NSF-funded project? Get in touch.
September 12, 2025 at 7:57 PM
Do you like cichlids? Fossils? Fossil cichlids? Would you like to study them as part of a graduate degree at the University of Michigan, joining an NSF-funded project? Get in touch.
Reposted by Gareth Fraser
Last week I had my mind blown by the tenaculum,
a fleshy club-like appendage growing out of a male ghost shark's forehead. The structure is studded with teeth and used to keep females close during mating.
Latest for @nytimes.com explores the structure's evolution: www.nytimes.com/2025/09/06/s...
a fleshy club-like appendage growing out of a male ghost shark's forehead. The structure is studded with teeth and used to keep females close during mating.
Latest for @nytimes.com explores the structure's evolution: www.nytimes.com/2025/09/06/s...
Get to Know the Ratfish and the Forehead Teeth It Uses During Sex
www.nytimes.com
September 7, 2025 at 9:50 PM
Last week I had my mind blown by the tenaculum,
a fleshy club-like appendage growing out of a male ghost shark's forehead. The structure is studded with teeth and used to keep females close during mating.
Latest for @nytimes.com explores the structure's evolution: www.nytimes.com/2025/09/06/s...
a fleshy club-like appendage growing out of a male ghost shark's forehead. The structure is studded with teeth and used to keep females close during mating.
Latest for @nytimes.com explores the structure's evolution: www.nytimes.com/2025/09/06/s...
Excellent article on our latest ghost shark forehead "jaw" paper @pnas.org; written by @jack-tamisiea.bsky.social
@nytimes.com - "Get to Know the Ratfish and the Forehead Teeth It Uses During Sex" 👻🦈🦷 @karlycohen.bsky.social @ufresearch.bsky.social
www.nytimes.com/2025/09/06/s...
@nytimes.com - "Get to Know the Ratfish and the Forehead Teeth It Uses During Sex" 👻🦈🦷 @karlycohen.bsky.social @ufresearch.bsky.social
www.nytimes.com/2025/09/06/s...
Get to Know the Ratfish and the Forehead Teeth It Uses During Sex
www.nytimes.com
September 7, 2025 at 10:01 PM
Excellent article on our latest ghost shark forehead "jaw" paper @pnas.org; written by @jack-tamisiea.bsky.social
@nytimes.com - "Get to Know the Ratfish and the Forehead Teeth It Uses During Sex" 👻🦈🦷 @karlycohen.bsky.social @ufresearch.bsky.social
www.nytimes.com/2025/09/06/s...
@nytimes.com - "Get to Know the Ratfish and the Forehead Teeth It Uses During Sex" 👻🦈🦷 @karlycohen.bsky.social @ufresearch.bsky.social
www.nytimes.com/2025/09/06/s...
Reposted by Gareth Fraser
New preprint from some of my postdoc work on lungs! Co-led with Kaleb Hill, we studied smooth muscle and epithelial development in lizard lungs. Stay tuned for more!
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
September 5, 2025 at 6:12 PM
New preprint from some of my postdoc work on lungs! Co-led with Kaleb Hill, we studied smooth muscle and epithelial development in lizard lungs. Stay tuned for more!
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
Super excited to share our new paper, out today @pnas.org 'Teeth outside the jaw: Evolution and development of the toothed head clasper in chimaeras' @karlycohen.bsky.social 👻🦈 🦷 www.pnas.org/doi/10.1073/...
Teeth outside the jaw: Evolution and development of the toothed head clasper in chimaeras | PNAS
Chimaeras (Holocephali) are an understudied group of mostly deep-ocean cartilaginous
fishes (Chondrichthyes) with unique characteristics that disti...
www.pnas.org
September 4, 2025 at 6:26 PM
Super excited to share our new paper, out today @pnas.org 'Teeth outside the jaw: Evolution and development of the toothed head clasper in chimaeras' @karlycohen.bsky.social 👻🦈 🦷 www.pnas.org/doi/10.1073/...
Excited to share our new paper by @danpaluh.bsky.social out today in @royalsociety.org Open Science; with a great team, including undergraduate researchers! "The metamorphic transition of the frog mouth: from tadpole kertanized mouthparts to adult teeth" 🦷🐸
royalsocietypublishing.org/doi/10.1098/...
royalsocietypublishing.org/doi/10.1098/...
The metamorphic transition of the frog mouth: from tadpole keratinized mouthparts to adult teeth | Royal Society Open Science
Teeth have been a prominent feature of most vertebrates for 400 million years, and
the core regulatory network underlying embryonic tooth formation is deeply conserved.
In frogs, however, odontogenesi...
royalsocietypublishing.org
September 3, 2025 at 1:35 PM
Excited to share our new paper by @danpaluh.bsky.social out today in @royalsociety.org Open Science; with a great team, including undergraduate researchers! "The metamorphic transition of the frog mouth: from tadpole kertanized mouthparts to adult teeth" 🦷🐸
royalsocietypublishing.org/doi/10.1098/...
royalsocietypublishing.org/doi/10.1098/...
Ever wondered how #sharks produce an unlimited supply of teeth? Our new preprint uncovers the genes within the dental stem cell niche driving lifelong tooth development. "Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal" 🦈🦷
bit.ly/47kkRHL
bit.ly/47kkRHL
Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal
Sharks are masters of tooth regeneration with a rapid and unlimited tooth supply. We present a comprehensive transcriptomic analysis across five distinct compartments from the embryonic shark mouth, c...
bit.ly
September 3, 2025 at 1:20 PM
Ever wondered how #sharks produce an unlimited supply of teeth? Our new preprint uncovers the genes within the dental stem cell niche driving lifelong tooth development. "Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal" 🦈🦷
bit.ly/47kkRHL
bit.ly/47kkRHL
Reposted by Gareth Fraser
Our new paper is out in Royal Society Open Science! The metamorphic transition of the frog mouth: from tadpole keratinized mouthparts to adult teeth doi.org/10.1098/rsos...
September 2, 2025 at 11:33 PM
Our new paper is out in Royal Society Open Science! The metamorphic transition of the frog mouth: from tadpole keratinized mouthparts to adult teeth doi.org/10.1098/rsos...
Reposted by Gareth Fraser
Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal https://www.biorxiv.org/content/10.1101/2025.08.26.672487v1
August 31, 2025 at 6:31 AM
Shark tooth regeneration: RNAseq reveals genes for unlimited dental renewal https://www.biorxiv.org/content/10.1101/2025.08.26.672487v1
Check out this "donut" Sandbar #Shark (Carcharhinidae) embryo in #3D, #VR or #AR via @sketchfab.bsky.social, photogrammetry by Kayla Evans @floridamuseum.bsky.social. This specimen is from a set of embryos with spinal deformations. @ufresearch.bsky.social
skfb.ly/pAqxN
skfb.ly/pAqxN
Sandbar Shark, Carcharhinidae - 3D model by FloridaMuseum
A fluid preserved Sandbar Shark, Carcharhinus plumbeus, from the Florida Museum of Natural History Ichthyology Collection (UF 108719). This specimen is a fetus that has a spinal column deformity.
O...
skfb.ly
August 27, 2025 at 2:23 PM
Check out this "donut" Sandbar #Shark (Carcharhinidae) embryo in #3D, #VR or #AR via @sketchfab.bsky.social, photogrammetry by Kayla Evans @floridamuseum.bsky.social. This specimen is from a set of embryos with spinal deformations. @ufresearch.bsky.social
skfb.ly/pAqxN
skfb.ly/pAqxN
An article I wrote on the legacy of JAWS for the 50th anniversary was picked up by Australian Geographic! 🦈🦈 ausgeo.co/jaws
50 years after ‘Jaws’ the man-eater myth has been retired - Australian Geographic
In the half a century since Jaws was released we know so much more about sharks’ amazing biology.
ausgeo.co
July 23, 2025 at 3:02 PM
An article I wrote on the legacy of JAWS for the 50th anniversary was picked up by Australian Geographic! 🦈🦈 ausgeo.co/jaws
Reposted by Gareth Fraser
Here's a tortoise embryo developing inside its egg. Check out our new article in @cp-iscience.bsky.social to learn how molecular and mechanical systems sculpt their intricate head scales 🐢🧪
www.cell.com/iscience/ful...
www.cell.com/iscience/ful...
June 26, 2025 at 8:05 PM
Here's a tortoise embryo developing inside its egg. Check out our new article in @cp-iscience.bsky.social to learn how molecular and mechanical systems sculpt their intricate head scales 🐢🧪
www.cell.com/iscience/ful...
www.cell.com/iscience/ful...
Reposted by Gareth Fraser
First case of parthenogenesis in an intersexual zebra shark (Stegostoma tigrinum) having incomplete claspers onlinelibrary.wiley.com/doi/10.1111/...
June 24, 2025 at 4:57 PM
First case of parthenogenesis in an intersexual zebra shark (Stegostoma tigrinum) having incomplete claspers onlinelibrary.wiley.com/doi/10.1111/...
Reposted by Gareth Fraser
In 1975, “Jaws” – the tale of a killer great white shark that terrorizes a coastal tourist town – captured people’s imaginations and simultaneously created a widespread fear of the water. (via @us.theconversation.com)
It's been 50 years since the blockbuster movie ‘Jaws,’ but there's more to be revealed about shark biology
A shark expert, whose own curiosity about these fascinating fish was sparked by the movie "Jaws," explains some of their unique features and the many discoveries made in the decades after its release.
buff.ly
June 23, 2025 at 6:09 PM
In 1975, “Jaws” – the tale of a killer great white shark that terrorizes a coastal tourist town – captured people’s imaginations and simultaneously created a widespread fear of the water. (via @us.theconversation.com)
PBS News @pbsnews.org posted my article with @theconversation.com on the progress of shark science and the evolving perception of sharks since the release of 'JAWS', 50 years ago! 🦈🦈🦈 #jaws #jaws50 #sharks
In 1975, “Jaws” – the tale of a killer great white shark that terrorizes a coastal tourist town – captured people’s imaginations and simultaneously created a widespread fear of the water. (via @us.theconversation.com) buff.ly/fRa4vkp
June 22, 2025 at 12:58 AM
PBS News @pbsnews.org posted my article with @theconversation.com on the progress of shark science and the evolving perception of sharks since the release of 'JAWS', 50 years ago! 🦈🦈🦈 #jaws #jaws50 #sharks
50 years after ‘Jaws,’ researchers have retired the man-eater myth and revealed more about sharks’ amazing biology theconversation.com/50-years-aft...
50 years after ‘Jaws,’ researchers have retired the man-eater myth and revealed more about sharks’ amazing biology
A shark expert whose own curiosity about these fascinating fish was sparked by the movie explains some of their unique features. Many discoveries came in the decades after ‘Jaws.’
theconversation.com
June 18, 2025 at 3:26 PM
50 years after ‘Jaws,’ researchers have retired the man-eater myth and revealed more about sharks’ amazing biology theconversation.com/50-years-aft...
The “Tooth Hurty” Joke Has Its Origins In Ancient, Armored Fish - defector.com/the-tooth-hu...
The "Tooth Hurty" Joke Has Its Origins In Ancient, Armored Fish | Defector
Whenever Yara Haridy, a paleontologist at the University of Chicago, shows off the fossils she works with, people are often disappointed. Unlike the statuesque bones of dinosaurs or even the small spi...
defector.com
June 16, 2025 at 3:25 PM
The “Tooth Hurty” Joke Has Its Origins In Ancient, Armored Fish - defector.com/the-tooth-hu...
Cool shot of a super clear Catshark (Scyliorhinus canicula) egg. These shark egg cases vary in their transparency. This one is particularly see through. 🦈🦈🦈
May 29, 2025 at 10:03 PM
Cool shot of a super clear Catshark (Scyliorhinus canicula) egg. These shark egg cases vary in their transparency. This one is particularly see through. 🦈🦈🦈
Reposted by Gareth Fraser
Toothache may be hundreds of millions of years old. Teeth first evolved as sensory organs, not for chewing, according to a new analysis of animal fossils.
The first teeth were sensory organs on the skin of ancient fish
Teeth are good for chewing and biting, but they are also sensitive – and that may have been their original function hundreds of millions of years ago
www.newscientist.com
May 23, 2025 at 5:03 AM
Toothache may be hundreds of millions of years old. Teeth first evolved as sensory organs, not for chewing, according to a new analysis of animal fossils.
That look!! 👀 Our resident Bobcat came to visit this morning; captured on the backyard trail-cam! Such an awesome sight. I wonder if we'll have bob-kittens soon. 🐆 #bigcat #bobcat #backyardwildlife
April 16, 2025 at 8:01 PM
That look!! 👀 Our resident Bobcat came to visit this morning; captured on the backyard trail-cam! Such an awesome sight. I wonder if we'll have bob-kittens soon. 🐆 #bigcat #bobcat #backyardwildlife
Reposted by Gareth Fraser
The tooth, the whole tooth and nothing but the… frog? – the not-so bite-sized mystery of frog tooth re-evolution 🐸🦷
Check out this really fun post by @ryanharrison13.bsky.social, covering recent work from @danpaluh.bsky.social & team #preprint
#preLight ⬇️ 👀
prelights.biologists.com/highlights/t...
Check out this really fun post by @ryanharrison13.bsky.social, covering recent work from @danpaluh.bsky.social & team #preprint
#preLight ⬇️ 👀
prelights.biologists.com/highlights/t...
Tooth development in frogs: Implications for the re-evolution of lost mandibular teeth and the origin of a morphological innovation - preLights
The tooth, the whole tooth and nothing but the… frog? – the not-so bite-sized mystery of frog tooth re-evolution 🐸🦷
prelights.biologists.com
April 11, 2025 at 2:27 PM
The tooth, the whole tooth and nothing but the… frog? – the not-so bite-sized mystery of frog tooth re-evolution 🐸🦷
Check out this really fun post by @ryanharrison13.bsky.social, covering recent work from @danpaluh.bsky.social & team #preprint
#preLight ⬇️ 👀
prelights.biologists.com/highlights/t...
Check out this really fun post by @ryanharrison13.bsky.social, covering recent work from @danpaluh.bsky.social & team #preprint
#preLight ⬇️ 👀
prelights.biologists.com/highlights/t...
New Pre-Print Alert! "Teeth Outside the Jaw: Evolution and Development of the Toothed Head Clasper in Chimaeras." We use fossil evidence, development and CT scans through ghost shark ontogeny to describe the emergence of the tenaculum! 👻🦈🦷 @karlycohen.bsky.social
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
April 8, 2025 at 7:08 PM
New Pre-Print Alert! "Teeth Outside the Jaw: Evolution and Development of the Toothed Head Clasper in Chimaeras." We use fossil evidence, development and CT scans through ghost shark ontogeny to describe the emergence of the tenaculum! 👻🦈🦷 @karlycohen.bsky.social
www.biorxiv.org/content/10.1...
www.biorxiv.org/content/10.1...
Reposted by Gareth Fraser
🚨Registration for the UK #EvoDevo meeting is open! Join us on July 11th in London to enjoy an exciting day of talks, posters, friends, and superb science!
-Registration (only £5!): shorturl.at/9cQGL
-More info: londonevodevo.ac.uk
-Registration (only £5!): shorturl.at/9cQGL
-More info: londonevodevo.ac.uk
March 25, 2025 at 2:40 PM
🚨Registration for the UK #EvoDevo meeting is open! Join us on July 11th in London to enjoy an exciting day of talks, posters, friends, and superb science!
-Registration (only £5!): shorturl.at/9cQGL
-More info: londonevodevo.ac.uk
-Registration (only £5!): shorturl.at/9cQGL
-More info: londonevodevo.ac.uk
Reposted by Gareth Fraser
Exciting news! @wcratcliff.bsky.social and I published an essay last week in @nature.com reviewing the substantial contributions of 'long-term' studies to evolutionary biology
www.nature.com/articles/s41...
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www.nature.com/articles/s41...
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March 25, 2025 at 3:45 PM
Exciting news! @wcratcliff.bsky.social and I published an essay last week in @nature.com reviewing the substantial contributions of 'long-term' studies to evolutionary biology
www.nature.com/articles/s41...
1/n
www.nature.com/articles/s41...
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