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Prof. Juan Cisneros ⚒️🐉

@cisneros.bsky.social

5.7K followers 610 following 500 posts

Paleontólogo na UFPI, Teresina. Leio os ossos e as rochas. Desvendo o passado. Imigrante. Anticolonialista. Repatriação. Restituição. 🇸🇻 🇧🇷 🇿🇦 https://pt.wikipedia.org/wiki/Juan_Carlos_Cisneros

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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · Oct 20

Pros recém chegados: Sou um paleontólogo salvadorenho adotado pelo Piauí, trabalhando desde 2010 na UFPI. Pesquiso vertebrados fósseis, com foco no Período Permiano. Pra desespero de alguns, dedico-me a denunciar casos de colonialismo científico e tráfico de fósseis. Tb faço ilustração científica.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Emil L’Amour @vireosy.bsky.social · 3h

zebra shark, adult and juvenile

(Swim On 9, 2023) #art #sciart 🎨🦑🦈

$Illustration of a juvenile and adult zebra shark swimming near the ocean floor. Sunlight streams through the water, light refracting onto the sand and backs of each shark. The adult swims below in a gentle curve while the juvenile swims overhead, demonstrating the black and white stripes that earned this shark its name.$

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Reposted by Prof. Juan Cisneros ⚒️🐉

Agroflorestor e urbanista @agricultorurbano07.bsky.social · 8h

Muito louco pensar que aqui no Nordeste já teve araucárias, ursos, tigres dente-de-sabre, e preguiças gigantes

Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 1d

Um galinho de Brachyphyllum, um tipo de araucária que viveu no Nordeste há +100 milhões de anos. #FossilFriday

Foto mostrando um pequeno galho fossilizado, de cor laranja-marrom, dentro de uma laje de rocha amarelada.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Menina canceriana @meninacanceriana.bsky.social · 1d

Eu tenho até um adesivo

www.meninacanceriana.com.br/pd-97d8e9-ad...

Uma figura escrita ia é coisa de corno numa elipse
Embaixo uma mão cheia de flores

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Reposted by Prof. Juan Cisneros ⚒️🐉

Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 1d

Um galinho de Brachyphyllum, um tipo de araucária que viveu no Nordeste há +100 milhões de anos. #FossilFriday

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Reposted by Prof. Juan Cisneros ⚒️🐉

Erika Anderson @andersonmineral.bsky.social · 1d

The fierce carnivore Inostrancevia is one of the species of synapsids that went extinct in the Great Dying, known as the Permian-Triassic Extinction event. #FossilFriday ⚒️🧪

Mounted skeleton of fossil Inostrancevia with its body facing left. It’s skull shows large saver like teeth. It stands on a bed of shale fragments on a plinth with red plexiglass behind it. At the Royal Ontario Museum.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Dr Suresh Singh @palaeosingh.bsky.social · 1d

A couple snapshots of an ancient apex predator for this #FossilFriday - presenting the fossil teeth & snout of an #Erythrosuchus africanus, the big-headed, hypercarnivorous archosauromorph from the Early-Mid #Triassic of South Africa 🇿🇦

#Paleontology #Science

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Isolated teeth of Erythrosuchus africanus from the collections of the Natural History Museum UK.

The tip of the snout of Erythrosuchus africanus from the collections of the Natural History Museum UK.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Moo Dog Press @moodogpress.com · 1d

📷 digsfossils.com/fossils/foot...

#FossilFriday

(Details about each is below the images. Portland Formation, CT.)

Portland, Connecticut--where a visitor can find chunks of fossil-bearing stone along some yards in town. And view quarries.

Tracks from a comprehensive site: https://digsfossils.com/fossils/footprints_ct_portland.html

Don't miss the "open drawer" to the left of the page. Toggle between time eras, rich in knowledge, a delight to browse, think, learn.

Also see:
https://digsfossils.com/fossils/footprints_ct_new-haven.html

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Reposted by Prof. Juan Cisneros ⚒️🐉

Claude ✡️🦖🦕 @cascoclauda.bsky.social · 1d

happy #fossilfriday! this is diabloceratops, a ceratopsian from the late cretaceous. named in 2010, it is one of the oldest ceratopsids in the fossil record, and is mostly considered a basal member of the clade centrosaurinae
(art by andrey atuchin)

a partly reconstructed diabloceratops skull, as the holotype is incomplete

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Reposted by Prof. Juan Cisneros ⚒️🐉

Jurassic James65® @jurassicjames65.bsky.social · 1d

Happy #fossilfriday did ypu know Stegosaurs, means "roofed lizard".

The next time you visit a museum, consider the fact that the Stegosaur's plates are suspended above the skeleton. This is due to their position in life being attached to the animals skin and not directly the skeleton.

#dinosaurs

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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 1d

Um galinho de Brachyphyllum, um tipo de araucária que viveu no Nordeste há +100 milhões de anos. #FossilFriday

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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 3d

Uma planta que todo mundo deveria ter no quintal. Cresce rápido e fácil, dá pra preparar de tantas maneiras, substitui espinafre e couve.

Revista Fórum @revistaforum.com.br · 3d

Rica em proteínas e antioxidantes, barata e desconhecida: aprenda uma receita com taioba

Confira:

Rica em proteínas e antioxidantes, barata e desconhecida: aprenda uma receita com taioba

Descubra o que a ciência diz sobre essa PANC e dicas de como prepará-la para usufruir melhor de seus benefícios

revistaforum.com.br

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Reposted by Prof. Juan Cisneros ⚒️🐉

Emily Stepp @emilyart.bsky.social · 4d

#Paleoctober2025 day 6 paleoart sketch of the giant Late Triassic ichthyosaur Ichthyotitan.

#Paleoctober #Paleoart #ichthyosaur #Ichthyotitan

Painterly hour long digital sketch of the massive ichthyosaur in cool ocean waters with much smaller ammonites swimming past.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 5d

O Piauí esconde florestas petrificadas -sim, isso é um tronco de milhões de anos- como nenhum outro estado do Brasil. Dia mundial da geodiversidade UNESCO. #geodiversityday

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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 4d

Os de Mata são triássicos, os nossos são permianos (+antigos). Os nossos são maiores, como se pode ver na foto. A diferença de Mata, muitos dos nossos troncos estão na posição vertical, ou seja, em posição de vida. Mas os de Mata são bem interessantes e representam espécies diferentes das nossas.

Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 5d

O Piauí esconde florestas petrificadas -sim, isso é um tronco de milhões de anos- como nenhum outro estado do Brasil. Dia mundial da geodiversidade UNESCO. #geodiversityday

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Prof. Juan Cisneros ⚒️🐉 @cisneros.bsky.social · 5d

O rei dos mares jurássicos.

Bob Nicholls Art @bobnichollsart.bsky.social · 5d

A zoom into my reconstruction of the "sea-rex," a Jurassic pliosaur. This piece was commissioned by The Etches Collection, which is where the spectacular skull is exhibited. Also pictured is a smaller "sea-rex"

#SciArt #PaleoArt #MarineReptiles #Pliosaur #Pliosaurus #SeaRex #Jurassic #JurassicWorld

Reposted by Prof. Juan Cisneros ⚒️🐉

Claude ✡️🦖🦕 @cascoclauda.bsky.social · 5d

my friend @gulop1th3cuz.bsky.social has asked me to write a thread about his favourite extinct animal, the giant ground sloth megatherium, for his birthday! happy birthday gulo 🥳
(art by @haiderjaffri.bsky.social)

art depicting megatherium standing in a rugged landscape, with a snow-capped mountain in the background

a skeletal mount of megatherium standing on its hindlegs

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Reposted by Prof. Juan Cisneros ⚒️🐉

María Clara - Diva of Discontent by Bluesky @mariamariahclara.bsky.social · 8d

Fui fazer uma visita domiciliar para paciente acamado e encontrei essa lindona no quintal deles.

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Reposted by Prof. Juan Cisneros ⚒️🐉

cenofreak88.bsky.social @cenofreak88.bsky.social · 8d

Welcome to the first instalment of #gomphtober2025 where we spotlight gomohotheres and their relatives. Kicking things off is Stegomastodon Arizona from the pliocene of Arizona.

#fossilfriday #smithsonian #nationalmuseumofnaturalhistory #elephant #fossil #prehistoricarizona #paleontology

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Reposted by Prof. Juan Cisneros ⚒️🐉

Robert Boessenecker, Dr. of Whaleontology ™️ @coastalpaleo.bsky.social · 8d

#fossilfriday The beautiful skull of the dwarf baleen whale Herpetocetus bramblei (Cetotheriidae) I discovered and excavated as an undergrad from the 5-6 myo Purisima Formation near Santa Cruz, California. Now in @ucmpberkeley.bsky.social collections!

A partial skull of a small baleen whale; it is about a meter long, light brown in color, with a long blowhole and a narrow, pyramidal braincase with high muscle attachment crests and a large eye socket. It's sitting on a white sheet with scale bars next to it.

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Reposted by Prof. Juan Cisneros ⚒️🐉

JH @jhemiptera.bsky.social · 8d

#FossilFriday Tambatitanis skeleton at the Tamba Dinosaur Museum, Japan

Replica of the Tambatitanis, showing its preserved parts.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Anthony Tackles Dead Cows @mosasaurologist.bsky.social · 8d

It's the first ##FossilFriday for Croctober! Here is the prototype reconstruction of Deinosuchus schwimmeri, from the late Cretaceous of Georgia and other places around the south.

I finally got a Pic with me in it for scale so you can see just how huge this dead gator was.🐊🧪

Gigantic skeleton of a gator in the museum atrium with curator for scale

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Reposted by Prof. Juan Cisneros ⚒️🐉

Adam Marsh @notthatmarsh.bsky.social · 8d

a pretty skull of the phytosaur Redondasaurus collected from the Navajo Nation and housed at @museumofnaz, on loan to PEFO #FossilFriday 🦖🧪

A gray white reptile skull in a black sand table

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Reposted by Prof. Juan Cisneros ⚒️🐉

GDLeahy @xrciseguy.bsky.social · 8d

#FossilFriday: Velociraptor mongoliensis, a dromaeosaurid theropod from the Upper Cretaceous of Mongolia. Though famous for its appearances in the #Jurassicpark and #jurassicworld films, the Velociraptor in those movies is actually modeled after Deinonychus, a much older theropod.

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Reposted by Prof. Juan Cisneros ⚒️🐉

Ferwen @ferwen.bsky.social · 7d

#FossilFriday ‘Black Beauty’, one of the smallest-known specimens of Tyrannosaurus rex, displayed at The Royal Tyrell Museum in Calgary, Alberta.
wp.me/p3ihHu-1MX

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