Chris Mah
@echinoblog.bsky.social
The "starfish guy"(but also a little about a lot of marine invertebrates, #echinoday #echinoderms. Kaiju, comics enthusiast. Marine scientist, taxonomist, deep-sea researcher. Statements/posts made here are my own & DO NOT REPRESENT HOST organizations
Pinned
Chris Mah
@echinoblog.bsky.social
· Nov 17
New Antarctic Starfish Are Doting Parents and Vicious Predators (Published 2023)
A close examination of a collection of starfish in the Smithsonian revealed even more starfish inside those starfish.
www.nytimes.com
A recent account of my research in the NYT! by @megadarren.bsky.social ! #echinoday www.nytimes.com/2023/08/04/s...
Reposted by Chris Mah
Morning all. Warm again but without the wind - glorious! Enjoy the Day 🌞
January 19, 2026 at 11:57 PM
Morning all. Warm again but without the wind - glorious! Enjoy the Day 🌞
Reposted by Chris Mah
Mount Rainier National Park
#photography #landscape #landscapephotography #nature #waterfall #washington #mountrainiernationalpark
#photography #landscape #landscapephotography #nature #waterfall #washington #mountrainiernationalpark
January 19, 2026 at 7:44 PM
Mount Rainier National Park
#photography #landscape #landscapephotography #nature #waterfall #washington #mountrainiernationalpark
#photography #landscape #landscapephotography #nature #waterfall #washington #mountrainiernationalpark
Reposted by Chris Mah
Reposted by Chris Mah
While walking along the rocky shore, I found the world’s most poisonous crab.
It’s safe as long as you don’t eat it, so I carefully admired its stunning metallic beauty 🦀✨️
It’s safe as long as you don’t eat it, so I carefully admired its stunning metallic beauty 🦀✨️
January 19, 2026 at 12:05 PM
While walking along the rocky shore, I found the world’s most poisonous crab.
It’s safe as long as you don’t eat it, so I carefully admired its stunning metallic beauty 🦀✨️
It’s safe as long as you don’t eat it, so I carefully admired its stunning metallic beauty 🦀✨️
Reposted by Chris Mah
Nothing to see here... 👀
2024 National Wildlife Photo Contest Honorable Mentions 📲: https://ow.ly/pcsz50XUab2
📸 Yuan Minghui
📝 Hunstman spider on bark lichens in Xishuangbanna, China
2024 National Wildlife Photo Contest Honorable Mentions 📲: https://ow.ly/pcsz50XUab2
📸 Yuan Minghui
📝 Hunstman spider on bark lichens in Xishuangbanna, China
January 19, 2026 at 2:03 PM
Nothing to see here... 👀
2024 National Wildlife Photo Contest Honorable Mentions 📲: https://ow.ly/pcsz50XUab2
📸 Yuan Minghui
📝 Hunstman spider on bark lichens in Xishuangbanna, China
2024 National Wildlife Photo Contest Honorable Mentions 📲: https://ow.ly/pcsz50XUab2
📸 Yuan Minghui
📝 Hunstman spider on bark lichens in Xishuangbanna, China
Reposted by Chris Mah
Reposted by Chris Mah
The Middle Fork of Bill Williams Creek at Tucker Trail #tuckertrail #billwilliamscreek #mttamalpais #mttam #mttamwatershed #mmwd #marinwater #landscapephotography
January 19, 2026 at 6:05 PM
The Middle Fork of Bill Williams Creek at Tucker Trail #tuckertrail #billwilliamscreek #mttamalpais #mttam #mttamwatershed #mmwd #marinwater #landscapephotography
Reposted by Chris Mah
Fragile pink sea urchins roam the seafloor in large groups, grazing on dead kelp and organic material. With each nibble, they make nutrients and carbon available for other organisms on the seafloor and in the water column above. Dive in: youtu.be/9aN3m4uO91c
youtu.be
January 14, 2026 at 6:19 PM
Fragile pink sea urchins roam the seafloor in large groups, grazing on dead kelp and organic material. With each nibble, they make nutrients and carbon available for other organisms on the seafloor and in the water column above. Dive in: youtu.be/9aN3m4uO91c
Reposted by Chris Mah
January 19, 2026 at 11:52 AM
Reposted by Chris Mah
#MolluscMonday: a lichen-encrusted example of the large Late Jurassic ammonite Titanites at Portland, Dorset.
January 12, 2026 at 6:32 AM
#MolluscMonday: a lichen-encrusted example of the large Late Jurassic ammonite Titanites at Portland, Dorset.
Reposted by Chris Mah
#MolluscMonday Two large heteromorph ammonites photographed over 20 years ago at a small museum in Bargemon, southern France. Unfortunately, details of identity, age and locality were not recorded.
January 12, 2026 at 7:54 AM
#MolluscMonday Two large heteromorph ammonites photographed over 20 years ago at a small museum in Bargemon, southern France. Unfortunately, details of identity, age and locality were not recorded.
Reposted by Chris Mah
Did somebody say…. #MolluscMonday!
I love these mimic octopuses for their mastery of disguise. Apparently, they can change shape, colour, and even behaviour to impersonate a whole range of other marine animals.
If you could impersonate a marine animal, what would you pick?
I love these mimic octopuses for their mastery of disguise. Apparently, they can change shape, colour, and even behaviour to impersonate a whole range of other marine animals.
If you could impersonate a marine animal, what would you pick?
January 19, 2026 at 11:30 AM
Did somebody say…. #MolluscMonday!
I love these mimic octopuses for their mastery of disguise. Apparently, they can change shape, colour, and even behaviour to impersonate a whole range of other marine animals.
If you could impersonate a marine animal, what would you pick?
I love these mimic octopuses for their mastery of disguise. Apparently, they can change shape, colour, and even behaviour to impersonate a whole range of other marine animals.
If you could impersonate a marine animal, what would you pick?
Reposted by Chris Mah
#molluscmonday !
Some unusual Mauritia arabica. The purple 'amethystina' form is now believed to be due to highly acidic discharges from a factory in Leyte Island in the Philippines. The pink ones are unusual overcast shells from Hainan, China
#mollusk #seashell #sciart #invertebrate
Some unusual Mauritia arabica. The purple 'amethystina' form is now believed to be due to highly acidic discharges from a factory in Leyte Island in the Philippines. The pink ones are unusual overcast shells from Hainan, China
#mollusk #seashell #sciart #invertebrate
January 19, 2026 at 8:12 PM
#molluscmonday !
Some unusual Mauritia arabica. The purple 'amethystina' form is now believed to be due to highly acidic discharges from a factory in Leyte Island in the Philippines. The pink ones are unusual overcast shells from Hainan, China
#mollusk #seashell #sciart #invertebrate
Some unusual Mauritia arabica. The purple 'amethystina' form is now believed to be due to highly acidic discharges from a factory in Leyte Island in the Philippines. The pink ones are unusual overcast shells from Hainan, China
#mollusk #seashell #sciart #invertebrate
Reposted by Chris Mah
Gulf of Mexico: Swimming Squid Serenade
YouTube video by Global Foundation For Ocean Exploration
youtu.be
January 18, 2026 at 7:22 AM
Reposted by Chris Mah
January 19, 2026 at 1:08 PM
Reposted by Chris Mah
A dwarf cuttlefish sampling the brunch menu, Seattle Aquarium 2023
#MarineLife #Cephalopods #Cuttlefish #Hungry #MolluscMonday #StumpySpined #Camouflage
#MarineLife #Cephalopods #Cuttlefish #Hungry #MolluscMonday #StumpySpined #Camouflage
January 19, 2026 at 1:29 PM
A dwarf cuttlefish sampling the brunch menu, Seattle Aquarium 2023
#MarineLife #Cephalopods #Cuttlefish #Hungry #MolluscMonday #StumpySpined #Camouflage
#MarineLife #Cephalopods #Cuttlefish #Hungry #MolluscMonday #StumpySpined #Camouflage
Reposted by Chris Mah
#MolluscMonday Neither nautiloid nor ammonite, this is an early ammonoid, Timanites keyserlingi (Order Agoniatitida) of Devonian age. The large body chamber in this specimen is sediment-filled, whereas the chambers forming the phragmocone are infilled with calcite.
January 19, 2026 at 7:56 AM
#MolluscMonday Neither nautiloid nor ammonite, this is an early ammonoid, Timanites keyserlingi (Order Agoniatitida) of Devonian age. The large body chamber in this specimen is sediment-filled, whereas the chambers forming the phragmocone are infilled with calcite.
Reposted by Chris Mah
It's #MolluscMonday and right now the only molluscs I have convenient pics of are nudibranchs. So, here's Halgerda batangas. It wasn't snowing in Anilao - that's just backscatter from particles in the water that I was too lazy to edit out.
#MarineLife #Invertebrates 🌿
#MarineLife #Invertebrates 🌿
January 19, 2026 at 10:26 PM
It's #MolluscMonday and right now the only molluscs I have convenient pics of are nudibranchs. So, here's Halgerda batangas. It wasn't snowing in Anilao - that's just backscatter from particles in the water that I was too lazy to edit out.
#MarineLife #Invertebrates 🌿
#MarineLife #Invertebrates 🌿
Reposted by Chris Mah
An FBI agent conducted an initial review of the Renee Good killing and determined sufficient grounds existed to open a civil rights probe into the actions of the ICE officer who shot her. Justice Department says no inquiry is warranted. @perrystein.bsky.social www.washingtonpost.com/national-sec...
FBI opened probe on Minneapolis shooting; none exists now, Justice Dept. says
After the death of Renée Good in Minneapolis, FBI agents launched a civil rights probe into the shooting. The Justice Department says no such case now exists.
www.washingtonpost.com
January 19, 2026 at 6:59 PM
An FBI agent conducted an initial review of the Renee Good killing and determined sufficient grounds existed to open a civil rights probe into the actions of the ICE officer who shot her. Justice Department says no inquiry is warranted. @perrystein.bsky.social www.washingtonpost.com/national-sec...
Reposted by Chris Mah
In under the wire for #MolluskMonday with the geoduck, Panopea.
🦪⚒️🧪
These are deep burrowing, long-lived bivalves with obscenely long siphons used for suspension feeding and respiration from a meter or more under the sediment surface. The gape and pallial sinus hint at the large, fleshy siphon.
🦪⚒️🧪
These are deep burrowing, long-lived bivalves with obscenely long siphons used for suspension feeding and respiration from a meter or more under the sediment surface. The gape and pallial sinus hint at the large, fleshy siphon.
January 19, 2026 at 10:48 PM
In under the wire for #MolluskMonday with the geoduck, Panopea.
🦪⚒️🧪
These are deep burrowing, long-lived bivalves with obscenely long siphons used for suspension feeding and respiration from a meter or more under the sediment surface. The gape and pallial sinus hint at the large, fleshy siphon.
🦪⚒️🧪
These are deep burrowing, long-lived bivalves with obscenely long siphons used for suspension feeding and respiration from a meter or more under the sediment surface. The gape and pallial sinus hint at the large, fleshy siphon.
Reposted by Chris Mah
Some lovely Apiocrinites crinoid fossils on Canon Street. Jurassic Massangis Limestone. More at www.londonpavementgeology.co.uk/location-det...
January 19, 2026 at 6:38 PM
Some lovely Apiocrinites crinoid fossils on Canon Street. Jurassic Massangis Limestone. More at www.londonpavementgeology.co.uk/location-det...
Reposted by Chris Mah
Had a little spare time to interact with some ophiuroids too. These are the understudied yet ubiquitous and cryptic denizens of the coral reefs.
December 6, 2025 at 11:54 PM
Had a little spare time to interact with some ophiuroids too. These are the understudied yet ubiquitous and cryptic denizens of the coral reefs.
Reposted by Chris Mah
Emergency sampling in the USVI as part of our NSF Diadema project. Didn’t even know I was coming down here yesterday at breakfast; today flew down, and was in the water within 45 mins of arrival. Unfortunately, it’s happening at our site (but this is good for our study). Urchins are dying…
January 16, 2026 at 2:17 AM
Emergency sampling in the USVI as part of our NSF Diadema project. Didn’t even know I was coming down here yesterday at breakfast; today flew down, and was in the water within 45 mins of arrival. Unfortunately, it’s happening at our site (but this is good for our study). Urchins are dying…
Reposted by Chris Mah
Another day of responding to Diadema disease as part of our NSF project in St Thomas. Today a different site where they are totally fine then a return to the impact site to gain cultures. Sad to see these important organisms in distress. Had a clue today from microscopy about another stressor.
January 16, 2026 at 11:22 PM
Another day of responding to Diadema disease as part of our NSF project in St Thomas. Today a different site where they are totally fine then a return to the impact site to gain cultures. Sad to see these important organisms in distress. Had a clue today from microscopy about another stressor.
Reposted by Chris Mah
This is what it looks like when they’re just about to die
January 16, 2026 at 11:22 PM
This is what it looks like when they’re just about to die