Dr. Karly E. Cohen
@karlycohen.bsky.social
Postdoc and lecturer at University of Washington Friday Harbors Labs looking at the tools organisms use to interact with the world |She/Her
https://www.karlye-cohen.com
https://www.karlye-cohen.com
Pinned
This common fish has an uncommon feature: forehead teeth, used for mating
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish, a shark-like species native to the eastern Pacific Ocean, have rows of teeth on top of their heads,...
www.washington.edu
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Priority deadline (Feb 16) for this years Fish Class at Friday Harbor is coming up quick! Get your applications in for what will be an amazing summer filled with great science, people, and tools!
Financial aid is available!!
@cmdonatelli.bsky.social @fishguy.bsky.social @karlycohen.bsky.social
Financial aid is available!!
@cmdonatelli.bsky.social @fishguy.bsky.social @karlycohen.bsky.social
February 6, 2026 at 8:27 PM
Priority deadline (Feb 16) for this years Fish Class at Friday Harbor is coming up quick! Get your applications in for what will be an amazing summer filled with great science, people, and tools!
Financial aid is available!!
@cmdonatelli.bsky.social @fishguy.bsky.social @karlycohen.bsky.social
Financial aid is available!!
@cmdonatelli.bsky.social @fishguy.bsky.social @karlycohen.bsky.social
Reposted by Dr. Karly E. Cohen
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
January 12, 2026 at 6:39 PM
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
Reposted by Dr. Karly E. Cohen
There are a few courses that shaped the trajectory of my career. This is one of them. Take it if you can!
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
January 12, 2026 at 7:05 PM
There are a few courses that shaped the trajectory of my career. This is one of them. Take it if you can!
Reposted by Dr. Karly E. Cohen
Fun opportunity for early career individuals at Friday Harbor Labs. Everyone I know who has taken or been involved in this course has a great time. Highly recommend.
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
January 12, 2026 at 7:34 PM
Fun opportunity for early career individuals at Friday Harbor Labs. Everyone I know who has taken or been involved in this course has a great time. Highly recommend.
Reposted by Dr. Karly E. Cohen
Early students must take this!!
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
January 12, 2026 at 6:42 PM
Early students must take this!!
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
January 12, 2026 at 6:39 PM
Summer fish class at Friday Harbor Labs 🐟
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
5 weeks, field + lab, real projects.
Open to grads, postdocs, and undergrads. Financial aid available.
Apply: February 16, 2026
Reach out to @cmdonatelli.bsky.social @fishguy.bsky.social or @karlycohen.bsky.social with questions!
Details in the flyer ⬇️
Reposted by Dr. Karly E. Cohen
Have you read ICB's issue 6 yet?
with Applied #ecoimmunology in #wildlife health and #conservation
& authors
@schulzscience.bsky.social
@karlycohen.bsky.social Cohen
@thomsanger.bsky.social Sanger
@cmdonatelli.bsky.social Donatelli
Stacy Farina
and more!
academic.oup.com/icb/issue/65/6
with Applied #ecoimmunology in #wildlife health and #conservation
& authors
@schulzscience.bsky.social
@karlycohen.bsky.social Cohen
@thomsanger.bsky.social Sanger
@cmdonatelli.bsky.social Donatelli
Stacy Farina
and more!
academic.oup.com/icb/issue/65/6
December 22, 2025 at 1:34 PM
Have you read ICB's issue 6 yet?
with Applied #ecoimmunology in #wildlife health and #conservation
& authors
@schulzscience.bsky.social
@karlycohen.bsky.social Cohen
@thomsanger.bsky.social Sanger
@cmdonatelli.bsky.social Donatelli
Stacy Farina
and more!
academic.oup.com/icb/issue/65/6
with Applied #ecoimmunology in #wildlife health and #conservation
& authors
@schulzscience.bsky.social
@karlycohen.bsky.social Cohen
@thomsanger.bsky.social Sanger
@cmdonatelli.bsky.social Donatelli
Stacy Farina
and more!
academic.oup.com/icb/issue/65/6
Reposted by Dr. Karly E. Cohen
Check out this really fun interview I got to work on with Mitch Borden on one of my favorite fish, the spiny lumpsucker!
www.knkx.org/science/2025...
www.knkx.org/science/2025...
Toothy armor, suction cups: Pacific spiny lumpsuckers persevere in Puget Sound
The small, clumsy fish isn’t the strongest or fastest creature living in Puget Sound. But it has developed other tools to survive in rough waters.
www.knkx.org
October 10, 2025 at 7:06 PM
Check out this really fun interview I got to work on with Mitch Borden on one of my favorite fish, the spiny lumpsucker!
www.knkx.org/science/2025...
www.knkx.org/science/2025...
Check out this really fun interview I got to work on with Mitch Borden on one of my favorite fish, the spiny lumpsucker!
www.knkx.org/science/2025...
www.knkx.org/science/2025...
Toothy armor, suction cups: Pacific spiny lumpsuckers persevere in Puget Sound
The small, clumsy fish isn’t the strongest or fastest creature living in Puget Sound. But it has developed other tools to survive in rough waters.
www.knkx.org
October 10, 2025 at 7:06 PM
Check out this really fun interview I got to work on with Mitch Borden on one of my favorite fish, the spiny lumpsucker!
www.knkx.org/science/2025...
www.knkx.org/science/2025...
Reposted by Dr. Karly E. Cohen
NSF GRFP solicitation is finally up. Life Sci deadline extended to Nov 10 but 2nd year grad students no longer eligible www.nsf.gov/funding/oppo...
NSF Graduate Research Fellowship Program (GRFP)
www.nsf.gov
September 26, 2025 at 8:00 PM
NSF GRFP solicitation is finally up. Life Sci deadline extended to Nov 10 but 2nd year grad students no longer eligible www.nsf.gov/funding/oppo...
Reposted by Dr. Karly E. Cohen
Behold the Gloriously Weird Spotted Ratfish. It Has Teeth on Its Forehead for Sex
Behold the Gloriously Weird Spotted Ratfish. It Has Teeth on Its Forehead for Sex
Researchers have finally traced the origin of the spotted ratfish’s bizarre forehead teeth, which are used for mating
www.scientificamerican.com
September 6, 2025 at 4:57 PM
Behold the Gloriously Weird Spotted Ratfish. It Has Teeth on Its Forehead for Sex
Reposted by Dr. Karly E. Cohen
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish have rows of teeth on top of their heads, in addition to those in their jaws. They use these teeth to grip females while mating. @karlycohen.bsky.social
More: www.washington.edu/news/2025/09...
More: www.washington.edu/news/2025/09...
September 5, 2025 at 6:30 PM
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish have rows of teeth on top of their heads, in addition to those in their jaws. They use these teeth to grip females while mating. @karlycohen.bsky.social
More: www.washington.edu/news/2025/09...
More: www.washington.edu/news/2025/09...
Reposted by Dr. Karly E. Cohen
New species alert! A Pascua goby from the Coral Sea. This genus now contains four species. Two from the Eastern Pacific and two from Australia, with more than 5,500km separating them. Lots of fun describing my second new species. #TeamFish #Fish
doi.org/10.3390/fish...
doi.org/10.3390/fish...
September 4, 2025 at 10:15 AM
New species alert! A Pascua goby from the Coral Sea. This genus now contains four species. Two from the Eastern Pacific and two from Australia, with more than 5,500km separating them. Lots of fun describing my second new species. #TeamFish #Fish
doi.org/10.3390/fish...
doi.org/10.3390/fish...
Reposted by Dr. Karly E. Cohen
Behold the gloriously weird Spotted Ratfish. It has teeth on its forehead for sex. The teeth line a cartilaginous appendage called a tenaculum that in males can be erected and used to grasp a female during mating 🧪
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
This common fish has an uncommon feature: forehead teeth, used for mating
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish, a shark-like species native to the eastern Pacific Ocean, have rows of teeth on top of their heads,...
www.washington.edu
September 4, 2025 at 8:56 PM
Behold the gloriously weird Spotted Ratfish. It has teeth on its forehead for sex. The teeth line a cartilaginous appendage called a tenaculum that in males can be erected and used to grasp a female during mating 🧪
Reposted by Dr. Karly E. Cohen
Bumping to the Fishes! and Science feeds🐟🧪
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
This common fish has an uncommon feature: forehead teeth, used for mating
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish, a shark-like species native to the eastern Pacific Ocean, have rows of teeth on top of their heads,...
www.washington.edu
September 4, 2025 at 8:30 PM
Bumping to the Fishes! and Science feeds🐟🧪
Reposted by Dr. Karly E. Cohen
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/...
Reposted by Dr. Karly E. Cohen
Super cool!! What a weird fish #TeamFish
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
This common fish has an uncommon feature: forehead teeth, used for mating
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish, a shark-like species native to the eastern Pacific Ocean, have rows of teeth on top of their heads,...
www.washington.edu
September 4, 2025 at 7:09 PM
Super cool!! What a weird fish #TeamFish
Reposted by Dr. Karly E. Cohen
Coolest fish is a ratfish and they have teeth on the head for mating. @karlycohen.bsky.social's most recent with a great Ray Troll piece of art.
🧪🐡
www.washington.edu/news/2025/09...
🧪🐡
www.washington.edu/news/2025/09...
September 4, 2025 at 7:13 PM
Coolest fish is a ratfish and they have teeth on the head for mating. @karlycohen.bsky.social's most recent with a great Ray Troll piece of art.
🧪🐡
www.washington.edu/news/2025/09...
🧪🐡
www.washington.edu/news/2025/09...
Article link here! www.pnas.org/doi/10.1073/...
September 4, 2025 at 7:06 PM
Article link here! www.pnas.org/doi/10.1073/...
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
This common fish has an uncommon feature: forehead teeth, used for mating
New findings call into question one of the core assumptions about teeth. Adult male spotted ratfish, a shark-like species native to the eastern Pacific Ocean, have rows of teeth on top of their heads,...
www.washington.edu
September 4, 2025 at 7:01 PM
New paper is officially out!
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
Ratfish have a second jaw on their foreheads - CT + histology show they’re real teeth, built from the same tissues and signals as oral teeth.
www.washington.edu/news/2025/09...
The incredible @shirel.bsky.social fills the room tonight for the FHL teaching us about how manta rays feed
July 10, 2025 at 12:25 AM
The incredible @shirel.bsky.social fills the room tonight for the FHL teaching us about how manta rays feed
Reposted by Dr. Karly E. Cohen
Of course there would be no paper w/o my co-authors @fishyologist.bsky.social, Allyson Evans, Thaddaeus Buser, @calliehcrawford.bsky.social, @emilykane.bsky.social, and Matt Kolmann.
HUGE thanks to NSF for funding, @fishguy.bsky.social for the FHL fish class, & Scripps and OSU for their fish.
HUGE thanks to NSF for funding, @fishguy.bsky.social for the FHL fish class, & Scripps and OSU for their fish.
June 27, 2025 at 2:14 PM
Of course there would be no paper w/o my co-authors @fishyologist.bsky.social, Allyson Evans, Thaddaeus Buser, @calliehcrawford.bsky.social, @emilykane.bsky.social, and Matt Kolmann.
HUGE thanks to NSF for funding, @fishguy.bsky.social for the FHL fish class, & Scripps and OSU for their fish.
HUGE thanks to NSF for funding, @fishguy.bsky.social for the FHL fish class, & Scripps and OSU for their fish.
Reposted by Dr. Karly E. Cohen
One reason I love this project is because of how many different tools and techniques we used. Field collections, high-speed feeding videos, CT scans of the jaw bones and muscles, scanning electron micrographs of the teeth, and lip histology....truly a tour de force of fun science.
June 27, 2025 at 2:14 PM
One reason I love this project is because of how many different tools and techniques we used. Field collections, high-speed feeding videos, CT scans of the jaw bones and muscles, scanning electron micrographs of the teeth, and lip histology....truly a tour de force of fun science.
Reposted by Dr. Karly E. Cohen
New fish paper! We found that Clinocottus globicpes eats anemones (weird!) using a novel wrestling behavior + strong jaws that likely started as adaptations for tearing algae. It also has thick skin that protects it from stinging cells. @jzoology.bsky.social 🐟🧪
DM for PDF.
doi.org/10.1111/jzo....
DM for PDF.
doi.org/10.1111/jzo....
June 27, 2025 at 2:14 PM
New fish paper! We found that Clinocottus globicpes eats anemones (weird!) using a novel wrestling behavior + strong jaws that likely started as adaptations for tearing algae. It also has thick skin that protects it from stinging cells. @jzoology.bsky.social 🐟🧪
DM for PDF.
doi.org/10.1111/jzo....
DM for PDF.
doi.org/10.1111/jzo....
Reposted by Dr. Karly E. Cohen
How could I forget to tag @karlycohen.bsky.social!!!
June 27, 2025 at 2:35 PM
How could I forget to tag @karlycohen.bsky.social!!!