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jvelezjuarbe.bsky.social

@jvelezjuarbe.bsky.social
196 followers 149 following 31 posts

Associate Curator at NHMLA. Vertebrate paleontologist with an interest in marine mammals and Caribbean vertebrates. Boricua🇵🇷 The Caribbean & Eastern Pacific are my playground! Views are my own.

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Natural History Museum of Los Angeles County @nhm.org · 05/10/2026
Would you believe this tooth is from one of the largest sharks that ever lived? 𝘖𝘵𝘰𝘥𝘶𝘴 𝘮𝘦𝘨𝘢𝘭𝘰𝘥𝘰𝘯 (previously classified as 𝘊𝘢𝘳𝘤𝘩𝘢𝘳𝘰𝘤𝘭𝘦𝘴 𝘮𝘦𝘨𝘢𝘭𝘰𝘥𝘰𝘯) could grow to more than 60 feet long, cementing its place as the largest predatory shark in Earth's history.
Tooth of 𝘖𝘵𝘰𝘥𝘶𝘴 𝘮𝘦𝘨𝘢𝘭𝘰𝘥𝘰𝘯 on display at NHM's Age of Mammals exhibition.
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Kiersten Formoso, PhD(epressed) @formorphology.bsky.social · 01/10/2026
Hi! My World View in Nature Reviews Biodiversity was published today! Read about my three main aims when educating people about topics in natural history. www.nature.com/articles/s44...
nature.com
Three ideas to inspire curiosity in natural history education
Nature Reviews Biodiversity - Natural history can captivate the minds of all manner of people for a multitude of reasons, but a shifting media landscape demands adaptation from public educators....
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Natural History Museum of Los Angeles County @nhm.org · 04/10/2026
Observing ornithology collections in a whole new light. Hear from #NightTales featured artist Maggie West about capturing these exquisite specimens for our new activation starting next month. —  go.nhm.org/maggie-west
When I was interviewing Allison, I had to ask: do more people like birdwatching now or am I just getting old? 

Allison told me birdwatching really has become more popular, especially among younger people. She saw a huge increase during COVID, when people began paying more attention to the birds in their own backyards. She also thinks its popularity reflects a desire to disconnect from screens and social media and reconnect with the natural world.

By the way, the above slide is a Grey-winged Trumpeter and you are not likely to see it in your back yard.  Unless your back yard is in a tropical rainforest in South America.

Art by Maggie West.One of the most fascinating things I learned is how different museum departments collaborate on environmental research. Allison showed me historic house finch specimens whose feathers still hold soot from LA’s air pollution. By analyzing that soot with the Mineral Sciences department, researchers can study changes in pollution over time and even identify sources like coal burning, automobile exhaust, diesel fuel and wildfire smoke.

By visiting the museum, you’re not only having a great time, you’re also supporting important research that helps us better understand our environment ✨

Courtesy of Maggie West.
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Florida Museum of Natural History @floridamuseum.bsky.social · 21/08/2026
An international team of scientists collected and carbon-dated more than 7,500 marine fossils to understand time averaging—in which organisms from different time periods are preserved together in the same fossil bed. Story: www.floridamuseum.ufl.edu/science/pale... Study: doi.org/10.1073/pnas...
close up of an oblong of sedimentary stone with many small shells embedded in it as well as several larger shells and an ancient sand dollar
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 17/08/2026
Full article: Physical evidence of crocodylian predation on ungulates in the Middle Miocene of Colombia www.tandfonline.com/doi/full/10....
tandfonline.com
Physical evidence of crocodylian predation on ungulates in the Middle Miocene of Colombia
South American fossil mammalian assemblages contain a relatively low ratio of predators to prey. Consequently, large non-mammalian predators occupy a major ecological role. In the Middle Miocene as...
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Natural History Museum of Los Angeles County @nhm.org · 12/08/2026
🐘 You're familiar with our iconic elephant diorama, but what do you know about earth's largest land animal? Celebrate this World Elephant Day with interesting facts courtesy of Dr. Kayce Bell, Associate Curator of Terrestrial Mammalogy.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 12/07/2026
Postcranial osteology of Boverisuchus vorax from the middle Eocene of Wyoming, USA: Implications for terrestrial adaptation in eusuchian crocodyliforms - Iijima - Journal of Anatomy - Wiley Online Library onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
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Richard Butler @richardjbutler.bsky.social · 13/07/2026
23 month research associate job now available with our team to work on Middle Jurassic mammals from Scotland. Requires strong experience with segmentation of CT data but does not require a PhD. Deadline for applications is 26th July. edzz.fa.em3.oraclecloud.com/hcmUI/Candid...
edzz.fa.em3.oraclecloud.com
Research Associate (Leverhulme) - School of Geography, Earth and Environmental Sciences - 105138 - Grade 6
This is a Research Associate position to assist in palaeobiological research conducted as part of the project “New Insights Into Early Mammal Evolution From Exceptional Scottish Fossils” funded by the...
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William B. Ludt, PhD @planet-of-fishes.bsky.social · 23/06/2026
Even giants start out small: new paper hot off the press documenting the early development of Giant Sea Bass led by Emily Ladin and Larry Allen. Link should provide free access: www.ichthyologyandherpetology.org/ihbjbf/awi20...
ichthyologyandherpetology.org
Developmental Osteology of Young-of-the-Year Giant Sea Bass, Stereolepis gigas — Ichthyology & Herpetology
Developmental Osteology of Young-of-the-Year Giant Sea Bass, Stereolepis gigas Emily S. Ladin, Michael P. Franklin, William B. Ludt, and Larry G. Allen
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Richard Butler @richardjbutler.bsky.social · 20/06/2026
The extent to which fieldwork in palaeontology (& other research areas) is valued has been in long-term decline, with funding challenging despite its fundamental importance. Will the rise of AI change this given that finding, collecting & studying new fossils cannot be done by a computer? I hope so.
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 21/06/2026
Functional morphology of the first known skeleton of Leptarctus (Mustelidae, Carnivora) clarifies the palaeoecology of a distinctive predator lineage sjp.pensoft.net/articles.php...
sjp.pensoft.net
Functional morphology of the first known skeleton of Leptarctus (Mustelidae, Carnivora) clarifies the palaeoecology of a distinctive predator lineage
Leptarctine mustelids are Neogene carnivorans with fossil records in Asia and North America. In the 170 years since the clade was erected, all taxa within this clade have been characterised based on c...
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Matt Friedman @friedmanlab.bsky.social · 01/06/2026
Busy past week or so for my mammal paleo colleagues at UMMP w/ new papers in Journal of Mammalian Evolution, Evolution, and Journal of Paleontology! Details below . . .
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PaleoJim @paleojim.bsky.social · 29/05/2026
#FossilFriday New ichnogenus of possible tritylodont tracks associated with newly discovered tritylodont bonebeds under study by @andrewtracks.bsky.social from Glen Canyon National Recreation Area. What long toes you have grandpa?
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Manolo Matos @manolomatos.bsky.social · 19/05/2026
Ya está el nuevo episodio con Agustín de Curiosidad Cientíifica. Escucha en: shows.acast.com/manolomatos
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Matt Friedman @friedmanlab.bsky.social · 14/05/2026
Another Thursday at the collection, so here's the holotype of the river dolphin Pomatodelphis bobengi (UMMP VP 15117) from the Miocene of Florida.
Photograph of dolphin skull and jaws in a drawer. Both are lying on green-gray panels. The rostrum is very long and narrow.
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Natural History Museum of Los Angeles County @nhm.org · 01/05/2026
When is a bird a mystery? When it’s an (a)enigma. Meet 𝘚𝘢𝘱𝘢𝘺𝘰𝘢 𝘢𝘦𝘯𝘪𝘨𝘮𝘢, a little green bird found in a thin slice of tropical rainforest cutting through Central and South America, including Colombia, the most bird-biodiverse country on the planet: go.nhm.org/lice-lens
go.nhm.org
One Tropical Bird's History Through the Lens of Lice
NHM's new Ornithology Collections Manager, Juliana Soto-Patiño, discovers the evolutionary origins of the mysterious Sapayoa aenigma through its parasitic louse
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PaleoJim @paleojim.bsky.social · 10/04/2026
Out working on basal Cedar Mt. east of Utahraptor Ridge capped by Naturita Fm. east of Utahraptor Ridge. Upper middle cliff is Poison Strip Mbr. Red Beds at base in Morrison Fm. Got Lower Yellow Cat described from base of section..some surprises.. Chert lenses near base. @utahpaleo-ufop.bsky.social
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Zoological Journal of the Linnean Society @zoojlinnsoc.bsky.social · 10/04/2026
It's #FossilFriday and you know what that means! We might have been slow today, but we're not sleeping on this neotropical giant ground sloth, where a near complete skull & 2 partial skeletons from Brazil shine a light on a previously misunderstood species! 🌍🧪👇 doi.org/10.1093/zool...
A hypothetical reconstruction of the mylodontine ground sloth, based on specimens in Brazilian caves. It stands tall, facing to the left, it's large square teeth bared and joined by a line of saliva. Its claws are menacing, but its hairdo reminds me of my aunt after a long day at the beach (wiry, short and windswept).
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 08/04/2026
Long before becoming giants like this 22 m #BlueWhale (Balaenoptera musculus) skull, baleen whales were small. The skull I’m holding is a cast of #Fucaia goedertorum (body lenght ~2.2 m), an early relative that still had teeth and used them to catch prey. #WhaleWednesday
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 08/04/2026
The deadline for the @societyofvertpaleo.bsky.social awards and grants is today!!
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The Anatomical Record @anatrecord.bsky.social · 08/04/2026
Are fossil seal bones misleading us? For years, scientists used isolated humeri & femora to name extinct seal species—but new research suggests that may not be reliable. Many fossil seals named from single bones may need a 2nd look. Dewaele et al.: anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 31/03/2026
The 2026 deadline for the @societyofvertpaleo.bsky.social awards and grants has been extended to April 8!! Feel free to reach out if you have questions about the Bryan Patterson Memorial Grant vertpaleo.org/patterson-me... #VertebratePaleontology #StudentGrants #Paleontology #Fieldwork
vertpaleo.org
Bryan Patterson Memorial Grant – Society of Vertebrate Paleontology
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William B. Ludt, PhD @planet-of-fishes.bsky.social · 27/03/2026
The deadline for our NHMLA Student Collections Study Award is coming up really soon. There are still a few more days to apply!
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The Palaeontological Association @thepalass.bsky.social · 27/03/2026
A new terror bird (Cariamiformes, Phorusrhacidae) from the Late Pleistocene of Brazil: insights into the last representatives of the family onlinelibrary.wiley.com/doi/10.1002/... #PapersinPalaeontology #FossilFriday
Top right: map showing the position (red dot) of the Toca dos Ossos Cave fossil locality, with inset showing South America. The State of Bahia, Brazil, is shaded grey on both.
Bottom left: Holotype specimen MCL-A-1.795, a left tibiotarsus, in medial view. Scale bar at top right is 1 cm.
Bottom middle: a life reconstruction of Eschatornis aterradora by Zeinner de Paula, with the position of the tibiotarsus indicated with converging straight lines.
Bottom right: red rectangle is cover image for the journal Papers in Palaeontology.
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Florida Museum of Natural History @floridamuseum.bsky.social · 27/03/2026
Congratulations! 👏👏👏 Michal Kowalewski has been selected as a 2025 fellow of the American Association for the Advancement of Science! Michal is the Thompson chair of invertebrate paleontology here at the Florida Museum. Read: www.floridamuseum.ufl.edu/science/mich...
headshot of a man with short hair and short beard stubble wearing a simple dark blue t-shirt against a green background like out of focus trees
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Prof. Valentin Fischer @val-fisch.bsky.social · 25/03/2026
New lab paper! We've applied fancy FEA to Cretaceous marine reptiles of the Western Interior Seaway. Lead by @just-fre.bsky.social, with @rboman.bsky.social, @narimanechatar.bsky.social, @palaeotheoryum.bsky.social, and me. onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com
Distinct feeding biomechanics in Late Cretaceous marine reptiles from the Western Interior Seaway
Sympatry of numerous predatory marine reptiles appears to be the rule rather than the exception in many Mesozoic formations, implying that these lineages are likely to have evolved some form of ecolo...
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Prof. Valentin Fischer @val-fisch.bsky.social · 24/03/2026
New lab paper, this time on phocid limb morphometrics! Lead by former EDDyLab postdoc Dr. Leonard Dewaele, with @narimanechatar.bsky.social, Prof. Mark Uhen, master student Jacques Klassen, and yours truly anatomypubs.onlinelibrary.wiley.com/doi/10.1002/...
anatomypubs.onlinelibrary.wiley.com
Long bone variability in true seals (Mammalia, Phocidae), with implications for understanding their fossil record
Historically, humeri and femora have been treated as diagnostic elements for fossil phocid (Carnivora, Pinnipedia, Phocidae) identification. This resulted in the naming of a plethora of extinct phoci...
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PaleoSynthesis @paleosynth.bsky.social · 20/03/2026
We are excited to present the latest workshop icon! CONSENSIS will take place in June in Erlangen and we are already looking forward to the exciting topic "sensory evolution"
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Natural History Museum of Los Angeles County @nhm.org · 23/03/2026
😌 Millions of years of lore under one roof. What's your favorite #NHMLA memory?
Dueling dinos displayed in NHMLAAfrican Mammal Hall in NHMLADinosaur hall in NHMLANature Gardens in NHMLA
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Adiel Klompmaker @paleoadiel.bsky.social · 13/03/2026
🐟 Bony fish discovery‼️ During my class field (Paleontology & Society) trip this Pachyrhizodus caninus jaw of 11" (28 cm) was found. Upper Cretaceous (lower Campanian, ~82 Ma) Mooreville Chalk, central Alabama. Discovered by George Martin. University of Alabama Museums paleo coll. #FossilFriday!!
Bony fish discovery‼️ During my class field (Paleontology & Society) trip this Pachyrhizodus caninus jaw of 11" (28 cm) was found. Upper Cretaceous (lower Campanian, ~82 Ma) Mooreville Chalk, central Alabama. Discovered by George Martin. #FossilFriday!! Closeup Bony fish discovery‼️ Field photo
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William B. Ludt, PhD @planet-of-fishes.bsky.social · 10/03/2026
Are you a student who wants to visit the NHMLA for your research? Do you advise or know a student who would benefit from visiting our collections? Well, there are three weeks left to apply for the NHMLA Student Collections Award. Help spread the word!
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Ocean Census @oceancensus.bsky.social · 10/03/2026
NEWS: Scientists from the Ocean Census and JAMSTEC have discovered 38 new species including deep sea polychaetes living in symbiosis with a marine sponge, ribbon worms and squat lobsters. Read more: oceancensus.org/press-releas...
oceancensus.org
Japan’s Deep Ocean Reveals Dozens of New Species from Landmark 2025 Nippon Foundation–Nekton Ocean Census – JAMSTEC Expedition
Following the Ocean Census-JAMSTEC expedition, scientists have confirmed the discovery of 38 new species and identified 28 further potential new species across two of Japan’s most understudied deep-sea regions: the Nankai Trough and the Shichiyo Seamount Chain.
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Darren Naish @tetzoo.bsky.social · 09/03/2026
Last night I watched all 4 eps of the new Netflix series The Dinosaurs. I tend not to comment on these kinds of shows as, having worked on them, I find that those people who criticize or critique them have no understanding of the competing pressures and factors inherent to the TV industry... 1/8
Netflix promo poster for The Dinosaurus, showing Spinosaurus jaws in shallow water with a shark swimming toward them.
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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 27/02/2026
O primeiro maxilar de "pelicossauro" encontrado na América do Sul. #FossilFriday
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 11/02/2026
The largest extinct volant bird Pelagornis could not meet the energetic demands of skimming url: royalsocietypublishing.org/rsos/article...
royalsocietypublishing.org
The largest extinct volant bird Pelagornis could not meet the energetic demands of skimming
Abstract. The fossil record is one of our only direct insights into the lives of extinct species. In recent years, the development of biomechanical and aer
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AshPoust @ashpoust.bsky.social · 11/02/2026
Our museum is part of the University's fund-drive: pardon the NPR-style interruption, but consider donating if you want to support public science. Wonderful donors are matching gifts, so it's a great chance to help us keep connecting the public with natural history. go.unl.edu/unsmglowbigred
go.unl.edu
Archie the Mammoth's Champion Profile | Glow Big Red 2026
Help Archie the Mammoth's champion efforts for Glow Big Red 2026
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Natural History Museum of Los Angeles County @nhm.org · 11/02/2026
Ever wonder how you can tell a dinosaur’s age? In a new study establishing Nanotyrannus as a species, researchers cross-sectioned slices of its hyoid to gauge maturity and understand how quickly it grew. Read more about the brand new discovery here: nhm.org/new-nanotyra...
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PaleoJim @paleojim.bsky.social · 09/01/2026
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 21/11/2025
#FossilFriday visiting some old friends! This was the first turtle shell I collected, it is a pelomedusoid from the early #Oligocene Juana Diaz Fm. in southwestern #PuertoRico. Pelomedusoids are found in shallow marine deposits across the #GreaterAntilles until the Pliocene. #CaribbeanPaleobiology
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Thomas R. Holtz, Jr. @arctomet.bsky.social · 21/11/2025
#FossilFriday The walking sea cow Pezosiren at the National Museum of Natural History
Mounted skeleton of the legged sea cow Pezosiren
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 14/11/2025
Happy #FossilFriday! Heading to #PuertoRico for some #fieldwork & R&R! So here's #Elasmodontomys obliquus, an endemic rodent of unusual size that became extinct a few thousand years ago, marking the end of a lineage that reached the West Indies ~33 million years ago!! #ROUS #RodentsoftheCaribbean
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Tristan J. Stock @archelosaurian.bsky.social · 13/11/2025
Tomorrow’s the big day. Feel free to stop by my poster on the evolution of pan-cheloniid pelagic specializations! #2025SVP #SeaTurtle
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Natural History Museum of Los Angeles County @nhm.org · 28/10/2025
One team. Decades of history. Revisit our time with #Dodgers Team Historian Mark Langill as fandom springs to life with the #WorldSeries! Let’s go, Dodgers!  go.nhm.org/dodgers
go.nhm.org
Fandom Springs to Life
Mark Langill | Team Historian, Los Angeles Dodgers
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Adiel Klompmaker @paleoadiel.bsky.social · 21/10/2025
‼️Special volume about arthropod paleontology was published today in the Journal of Paleontology, honoring the late Dr. Rodney Feldmann.🦀🦞🦐 Many of the 20 articles are open access. @paleosoc.bsky.social #paleontology #fossil #crab #lobster #shrimp Full volume: www.cambridge.org/core/journal...
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Natural History Museum of Los Angeles County @nhm.org · 21/10/2025
🦂 Scorpions? Not quite. Take a closer look into #NHMLA's Entomology collection and learn more about false scorpions with resident Assistant Curator of Entomology, Rodrigo Ruedas!
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John P. Friel, Ph.D. @friel.bsky.social · 17/10/2025
From auction houses to private apartments in Asia, this film peels back the curtain on a world few ever see: fossil hunters risking everything, dealers moving specimens across borders, collectors with their prehistoric trophies, and scientists fighting to protect irreplaceable clues to Earth’s past.
youtube.com
Inside The Multi-Million Dollar Global Dinosaur Fossil Market | Bones Of Contention - Part 1/2
YouTube video by CNA Insider
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jvelezjuarbe.bsky.social @jvelezjuarbe.bsky.social · 03/10/2025
My newest publication is out in @peerj.bsky.social! In this collaboration with Ana Valenzuela, Nick Pyenson & Mario Suarez we describe the most complete skeleton of the #AquaticSloth - #Thalassocnus - from #Chile! Artwork by @alexboersma-art.bsky.social 1/6 #FossilFriday peerj.com/articles/198...
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Kayce Bell @kaycebell.bsky.social · 23/09/2025
Hi! We need lice for our diversity and adaptation project. Specifically, we need lice from zebras, camelids (camels, llamas, alpacas, vicuñas, guanacos) & aardvarks. If you or someone you know might have lice, I'm happy to discuss our inclusive collaboration plans! sites.google.com/nhm.org/anop...
sites.google.com
Mammals & Lice
We are interested in understanding what drives host-parasite relationships. We are using the Anoplura (sucking lice) parasite and mammalian host system to generate a comprehensive sucking louse phylog...
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La Brea Tar Pits & Museum @tarpits.org · 17/09/2025
🍖 Hungry for History? Fossils from the #TarPits reveal the diets of saber-toothed cats, dire wolves, and more—served straight from asphalt. Take a bite into prehistory: bit.ly/TarPitsPD
Fossilized Bison teethFossilized Bison teethFossilized Camel teethFossilized Horse teeth
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Prof. Valentin Fischer @val-fisch.bsky.social · 17/09/2025
Are you tired of people constantly overestimating body size of marine reptiles? No longer! We provide equations to estimate body size in ichthyosaurians, mosasaurids, and thalattosuchians. 1/4
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