Kevin Stevens
@neohibolites.bsky.social
Pinned
Kevin Stevens
@neohibolites.bsky.social
· May 27
Biogeography, evolution, and ecology of the ancestral cichlids
This article examines the early evolution and biogeography of cichlids, discussing fossil evidence and the hypotheses regarding their origins. It reviews the debate between Gondwanan vicariance and ma...
cichlidae.com
What do we know about the earliest history of cichlid fishes? Here’s an extended and updated English version of my article on the biogeography and early evolution of cichlids, which I originally published in German in 2020. 🐟 🧪 #cichlid #biogeography #paleontology
cichlidae.com/article.php?...
cichlidae.com/article.php?...
Reposted by Kevin Stevens
„Neutral“ and breeding dress of a male Haplochromis sp. „Ruby Green“ cichlid. An already colorful fish becoming even more impressive. And in red and dark green somewhat fitting for the season? 🐟 #photography #fishkeeping
November 30, 2025 at 6:44 PM
„Neutral“ and breeding dress of a male Haplochromis sp. „Ruby Green“ cichlid. An already colorful fish becoming even more impressive. And in red and dark green somewhat fitting for the season? 🐟 #photography #fishkeeping
Reposted by Kevin Stevens
there's an entire superorder (very big category) of crustaceans called Syncarids, and like 99% of them are tiny white eyeless sub-millimeter things living in cavewater, except in Tasmania, where they just casually live on the surface world like regular shrimp. infuriating
November 30, 2025 at 5:05 PM
there's an entire superorder (very big category) of crustaceans called Syncarids, and like 99% of them are tiny white eyeless sub-millimeter things living in cavewater, except in Tasmania, where they just casually live on the surface world like regular shrimp. infuriating
„Neutral“ and breeding dress of a male Haplochromis sp. „Ruby Green“ cichlid. An already colorful fish becoming even more impressive. And in red and dark green somewhat fitting for the season? 🐟 #photography #fishkeeping
November 30, 2025 at 6:44 PM
„Neutral“ and breeding dress of a male Haplochromis sp. „Ruby Green“ cichlid. An already colorful fish becoming even more impressive. And in red and dark green somewhat fitting for the season? 🐟 #photography #fishkeeping
Reposted by Kevin Stevens
Reposted by Kevin Stevens
bryologists please keep your eyes out for the legendary American Moss Shrimp, probably about 1 mm long and looking something like this
November 30, 2025 at 5:00 AM
bryologists please keep your eyes out for the legendary American Moss Shrimp, probably about 1 mm long and looking something like this
Reposted by Kevin Stevens
A killifish not seen in 20 years and considered extinct has been found. The habitat where it was discovered has been destroyed, now farmland. It was recently found in a new location. All hail "Moema claudiae", still with us. 🌍⚒️ #TeamFish 🐟
Scientists Stunned As Rare Killifish Thought Extinct Is Found Alive in Bolivia
A long-lost Bolivian killifish has been found alive, revealing a globally important hotspot for seasonal killifish diversity at risk from deforestation. Researchers have confirmed the rediscovery of M...
scitechdaily.com
November 30, 2025 at 4:19 PM
A killifish not seen in 20 years and considered extinct has been found. The habitat where it was discovered has been destroyed, now farmland. It was recently found in a new location. All hail "Moema claudiae", still with us. 🌍⚒️ #TeamFish 🐟
Reposted by Kevin Stevens
Here is a watercolor painting of a Bluebarred Parrotfish, Scarus ghobban, terminal phase, for my Sunday Fish Sketch.
Reference photo(s) by Stephen Spangler, Scuba.Spanglers.com
#sciart #marinelife #coralreefs #oceanconservation
#parrotfish #spanglersscuba
#sundayfishsketch
Reference photo(s) by Stephen Spangler, Scuba.Spanglers.com
#sciart #marinelife #coralreefs #oceanconservation
#parrotfish #spanglersscuba
#sundayfishsketch
November 30, 2025 at 3:27 PM
Here is a watercolor painting of a Bluebarred Parrotfish, Scarus ghobban, terminal phase, for my Sunday Fish Sketch.
Reference photo(s) by Stephen Spangler, Scuba.Spanglers.com
#sciart #marinelife #coralreefs #oceanconservation
#parrotfish #spanglersscuba
#sundayfishsketch
Reference photo(s) by Stephen Spangler, Scuba.Spanglers.com
#sciart #marinelife #coralreefs #oceanconservation
#parrotfish #spanglersscuba
#sundayfishsketch
Reposted by Kevin Stevens
Can you feel it? #25DaysOfFishmas is in the air, and will kick off on Monday 🥳🐟🎅🥳
As a little teaser before I announce the theme tomorrow, here's a quick odd-one-out - one of these organisms would not fit into this year's category:
As a little teaser before I announce the theme tomorrow, here's a quick odd-one-out - one of these organisms would not fit into this year's category:
November 29, 2025 at 6:25 PM
Can you feel it? #25DaysOfFishmas is in the air, and will kick off on Monday 🥳🐟🎅🥳
As a little teaser before I announce the theme tomorrow, here's a quick odd-one-out - one of these organisms would not fit into this year's category:
As a little teaser before I announce the theme tomorrow, here's a quick odd-one-out - one of these organisms would not fit into this year's category:
Reposted by Kevin Stevens
Pyrite disease claims a tray full of French ammonites
November 30, 2025 at 2:10 AM
Pyrite disease claims a tray full of French ammonites
Reposted by Kevin Stevens
Another nice Oreosomatidae on the way back to the surface. They're hoping for 2 more dives before the expedition ends. @schmidtocean.bsky.social dive 875 #asgardarchaea #MarineLife
November 29, 2025 at 7:11 PM
Another nice Oreosomatidae on the way back to the surface. They're hoping for 2 more dives before the expedition ends. @schmidtocean.bsky.social dive 875 #asgardarchaea #MarineLife
Reposted by Kevin Stevens
Unfazed. 🐟 #photography #fishkeeping
November 21, 2025 at 6:33 PM
Unfazed. 🐟 #photography #fishkeeping
Reposted by Kevin Stevens
Latest paper in the Lance Grande volume is out! Several more are at proof stage so should be appearing soon.
New possible stem-falcon Masillaraptor buchheimi: deepblue.lib.umich.edu/items/616a40... 🪶🧪 (📷Li et al.)
November 29, 2025 at 5:51 PM
Latest paper in the Lance Grande volume is out! Several more are at proof stage so should be appearing soon.
Reposted by Kevin Stevens
Another new preprint, this one intended for a peer-reviewed journal, reports a new species of Lake Malawi cichlid, which probably attacks mouthbrooding female cichlids to feed on the eggs and larvae they are carrying. Preprints are not valid taxonomic publications.
ecoevorxiv.org/repository/v...
ecoevorxiv.org/repository/v...
Hemitaeniochromis pumba, a new species of cichlid fish from Lake Malawi, Africa, with comments on related species.
ecoevorxiv.org
November 28, 2025 at 11:45 PM
Another new preprint, this one intended for a peer-reviewed journal, reports a new species of Lake Malawi cichlid, which probably attacks mouthbrooding female cichlids to feed on the eggs and larvae they are carrying. Preprints are not valid taxonomic publications.
ecoevorxiv.org/repository/v...
ecoevorxiv.org/repository/v...
Reposted by Kevin Stevens
Chindongo minutus, a small, but fiercely territorial cichlid from the rocky shores around Nkhata Bay, Lake Malawi. Males defend 'algal gardens', picking off nutritious material from among the tough attached filaments & a spawning site among the rocks. The drab females are able to range more widely.
November 28, 2025 at 11:40 PM
Chindongo minutus, a small, but fiercely territorial cichlid from the rocky shores around Nkhata Bay, Lake Malawi. Males defend 'algal gardens', picking off nutritious material from among the tough attached filaments & a spawning site among the rocks. The drab females are able to range more widely.
Reposted by Kevin Stevens
Fun cichlid-paleo trivia: the Lake Victoria cichlid Paralabidochromis sauvagei is named after Henri Émile Sauvage, who, among many other taxa, first described the Late Jurassic pliosaur Liopleurodon ferox. 🧪🐟 #photography #paleontology
November 28, 2025 at 5:43 PM
Fun cichlid-paleo trivia: the Lake Victoria cichlid Paralabidochromis sauvagei is named after Henri Émile Sauvage, who, among many other taxa, first described the Late Jurassic pliosaur Liopleurodon ferox. 🧪🐟 #photography #paleontology
Reposted by Kevin Stevens
When it comes to remaining unseen, there are many animals with insanely good camouflage. But fish really take camouflage to every extreme. For this #FishOfTheWeek, let's look at fishes power of invisibility
1/6
1/6
November 28, 2025 at 7:05 PM
When it comes to remaining unseen, there are many animals with insanely good camouflage. But fish really take camouflage to every extreme. For this #FishOfTheWeek, let's look at fishes power of invisibility
1/6
1/6
Reposted by Kevin Stevens
Getting excited... for #FossilFriday ! Our Morrison Ankylosaur monograph may be published online in a week. Hopefully, this will lead to a fix in many ankylosaur phylogenies. A dozen known Morrison ankylosaur sites spanning 4 states. Who would have think it 35 years ago?
November 28, 2025 at 9:29 PM
Getting excited... for #FossilFriday ! Our Morrison Ankylosaur monograph may be published online in a week. Hopefully, this will lead to a fix in many ankylosaur phylogenies. A dozen known Morrison ankylosaur sites spanning 4 states. Who would have think it 35 years ago?
Reposted by Kevin Stevens
Presenting for #FossilFriday this bizarre 1.4 billion year old monstrosity. At first I thought the string of eggs was #Fungus contamination, but Raman data say no, it's kerogen with the correct thermal maturity*! Deets in alt text. Fossil is about 200 microns across. #Geology #Paleontology 1/2
November 28, 2025 at 5:37 PM
Presenting for #FossilFriday this bizarre 1.4 billion year old monstrosity. At first I thought the string of eggs was #Fungus contamination, but Raman data say no, it's kerogen with the correct thermal maturity*! Deets in alt text. Fossil is about 200 microns across. #Geology #Paleontology 1/2
Forgot #fossilfriday
Fun cichlid-paleo trivia: the Lake Victoria cichlid Paralabidochromis sauvagei is named after Henri Émile Sauvage, who, among many other taxa, first described the Late Jurassic pliosaur Liopleurodon ferox. 🧪🐟 #photography #paleontology
November 28, 2025 at 6:26 PM
Forgot #fossilfriday
Fun cichlid-paleo trivia: the Lake Victoria cichlid Paralabidochromis sauvagei is named after Henri Émile Sauvage, who, among many other taxa, first described the Late Jurassic pliosaur Liopleurodon ferox. 🧪🐟 #photography #paleontology
November 28, 2025 at 5:43 PM
Fun cichlid-paleo trivia: the Lake Victoria cichlid Paralabidochromis sauvagei is named after Henri Émile Sauvage, who, among many other taxa, first described the Late Jurassic pliosaur Liopleurodon ferox. 🧪🐟 #photography #paleontology
Reposted by Kevin Stevens
There is something stunning about the traditionally shaped goldfish. Simple, healthy, and likely to live for decades. But they get a lot larger than the fancy types.
November 28, 2025 at 3:09 PM
There is something stunning about the traditionally shaped goldfish. Simple, healthy, and likely to live for decades. But they get a lot larger than the fancy types.
Reposted by Kevin Stevens
You can give the Kannemeyeria skull a spin here: umorf.ummp.lsa.umich.edu/wp/specimen-...
November 28, 2025 at 3:18 PM
You can give the Kannemeyeria skull a spin here: umorf.ummp.lsa.umich.edu/wp/specimen-...
Reposted by Kevin Stevens
I'm trying to find a resource for finding out what species (reptiles in this case) each country has but can't seem to find a concise answer I'm trying to find out the total number for north africa and the middle east specifically. Any suggestions?
November 28, 2025 at 10:17 AM
I'm trying to find a resource for finding out what species (reptiles in this case) each country has but can't seem to find a concise answer I'm trying to find out the total number for north africa and the middle east specifically. Any suggestions?
Reposted by Kevin Stevens
An inspiring article for National Illustration Day: www.theguardian.com/artanddesign....
Most #paleoart is probably "illustration" rather than "art" (if, indeed, these are distinct categories) and is an excellent example of how images augment written/verbal communication and democratise #scicomm.
Most #paleoart is probably "illustration" rather than "art" (if, indeed, these are distinct categories) and is an excellent example of how images augment written/verbal communication and democratise #scicomm.
Informative, beautiful and deeply human: it’s time to cheer the underrated art of illustration | Oliver Jeffers
We do judge books by their covers. Illustrations spark young imaginations, solve problems, present information - and shape our world, says the children’s author on National Illustration Day
www.theguardian.com
November 28, 2025 at 9:34 AM
An inspiring article for National Illustration Day: www.theguardian.com/artanddesign....
Most #paleoart is probably "illustration" rather than "art" (if, indeed, these are distinct categories) and is an excellent example of how images augment written/verbal communication and democratise #scicomm.
Most #paleoart is probably "illustration" rather than "art" (if, indeed, these are distinct categories) and is an excellent example of how images augment written/verbal communication and democratise #scicomm.
Reposted by Kevin Stevens
Go my Bothriolepis... This year's fish pecan pie! Bothriolepis was a peculiar-looking placoderm from the Devonian period or the Paleozoic. It had two long pointed pectoral fins and silly little eyes on top of its head.
#fossil #fish #paleontology #bothriolepis
#fossil #fish #paleontology #bothriolepis
November 27, 2025 at 10:16 PM
Go my Bothriolepis... This year's fish pecan pie! Bothriolepis was a peculiar-looking placoderm from the Devonian period or the Paleozoic. It had two long pointed pectoral fins and silly little eyes on top of its head.
#fossil #fish #paleontology #bothriolepis
#fossil #fish #paleontology #bothriolepis