Dani Barrera Guevara @Barrerasaurus Twitter profile

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@jandakembangstw

Dani Barrera Guevara

@Barrerasaurus

6 months

The biggest Lambeosaurine Hadrosaur: Magnapaulia laticaudus Prieto-Márquez et al., 2012 LACM 17715, LACM 17698 - 17700, LACM 17702 - 17713 LACM 17716 - 17717, LACM 20873 - 20876, LACM 20883 - 20885. El Gallo Formation, Baja Califormia, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

3 months

NEW PAPER: Stratigraphic Reassessment of Mexican Chasmosaurine Coahuilaceratops magnacuerna as the First Diagnostic Dinosaur Remains from the Cerro Huerta Formation (Lower Maastrichtian) Supporting the Southern Origin of the Triceratopsini Open Access:

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Dani Barrera Guevara

@Barrerasaurus

6 months

Livyatan melvellei Lambert et al., 2010 MUSM 1676

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Dani Barrera Guevara

@Barrerasaurus

8 months

Perucetus colossus Bianucci et al., 2023. MUSM 3248

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Dani Barrera Guevara

@Barrerasaurus

5 months

Physeter macrocephalus Linnaeus, 1758

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Dani Barrera Guevara

@Barrerasaurus

7 months

Daspletosaurus wilsoni Warshaw & Fowler, 2022 BDM 107

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Dani Barrera Guevara

@Barrerasaurus

6 months

Tlatolophus galorum Ramírez-Velasco et al., 2021 CIC/P/147 Cerro del Pueblo Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

6 months

Daspletosaurus horneri Carr et al., 2017. MOR 590 See you at #DinosaursandMOR !

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Dani Barrera Guevara

@Barrerasaurus

4 months

Regaliceratops peterhewsi Brown & Henderson, 2015 TMP 2005.055.0001 St. Mary River Formation, Alberta, Canada.

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Dani Barrera Guevara

@Barrerasaurus

6 months

Inkayacu paracasensis ~ Commission for @kuzim_za ~

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Dani Barrera Guevara

@Barrerasaurus

8 months

Coronodon newtonorum Boessenecker et al., 2023 ChM PV 2778

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Dani Barrera Guevara

@Barrerasaurus

6 months

Tlatolophus galorum Ramirez-Velasco et al., 2021. CIC/P/147

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Dani Barrera Guevara

@Barrerasaurus

6 months

Velafrons coahuilensis Gates et al., 2007 СРС 59 Cerro del Pueblo Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

5 months

Tyrannosaurus rex MOR 008 - Right Lateral “Custer”

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Dani Barrera Guevara

@Barrerasaurus

4 months

The giant long-horned bison: Bison latifrons Harlan, 1825

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Dani Barrera Guevara

@Barrerasaurus

3 months

Coahuilaceratops magnacuerna Mexican Maastrichtian Horned Dinosaur. Skull reconstruction:

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Dani Barrera Guevara

@Barrerasaurus

6 months

Labocania anomala Molnar, 1974 IGM 5307 La Bocana Roja Formation, Baja California, Mexico

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Dani Barrera Guevara

@Barrerasaurus

6 months

Paraxenisaurus normalensis Serrano-Brañas et al., 2020 BENC ⅔-001, BENC ½-0054, BENC ½-0091, BENC ½-0092, BENC 3½-001. Cerro del Pueblo Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

5 months

Tyrannosaurus rex MOR 008 (Left Lateral) “Custer”

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Dani Barrera Guevara

@Barrerasaurus

6 months

Mexican Santonian Hadrosauromorph: Huehuecanauhtlus tiquichensis Ramírez-Velasco et al., 2012 IGM 6253 - 6254 Unnamed Formation, Michoacán, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

3 months

An early representative of the Triceratopsini? Coahuilaceratops magnacuerna (Loewen et al., 2010) CPC 276 - CPC 272 Cerro Huerta Formation, Coahuila, Mexico. (~71.5–70.5 Ma?) Lower Maastrichtian. Open access paper :

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Dani Barrera Guevara

@Barrerasaurus

5 months

Acantholipan gonzalezi Rivera-Sylva et al., 2018 CPC 272 Pen Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

5 months

Mexican Nasutoceraropsine? Yehuecauhceratops mudei Rivera-Sylva et al., 2017 CPC 274 Aguja Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

6 months

Latirhinus uitstlani Prieto-Márquez & Serrano-Brañas, 2012 IGM 6583 Cerro del Pueblo Formation, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

7 months

Nihoroa reimaea Coste te al., 2023. OU 22126

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Dani Barrera Guevara

@Barrerasaurus

6 months

Nihohae matakoi Coste, Fordyce, & Loch, 2023. OU 223975

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Dani Barrera Guevara

@Barrerasaurus

7 months

Niparajacetus palmadentis Solis-Añorve et al., 2019 MUEcSj 5/24/123

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Dani Barrera Guevara

@Barrerasaurus

7 months

Tarbosaurus bataar ZPAL MgD-I/4

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Dani Barrera Guevara

@Barrerasaurus

7 months

Daspletosaurus torosus Russel, 1970 CMN 8506

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Dani Barrera Guevara

@Barrerasaurus

4 months

NEW PAPER ON TYRANNOSAUR EVOLUTION Our latest article on Tyrannogenesis! -Tyrannosaurine Anagenesis- Coauthors: @eliaswarshaw @df9465 Published in Cretaceous Research Open Access: Art by: @GMonroyB1

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Dani Barrera Guevara

@Barrerasaurus

6 months

Corythosaurus “excavatus” Gilmore, 1932. Bramble et al., 2017. UALVP 13 - TMP 1992.036.0250

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Dani Barrera Guevara

@Barrerasaurus

5 months

Daspletosaurus wilsoni Warshaw & Fowler, 2022. BDM 107 Acrylic on Opaline.

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Dani Barrera Guevara

@Barrerasaurus

4 months

Differing hypotheses on the evolution of Daspletosaurus and the Tyrannosaurini. Cladogenesis & Anagenesis Warshaw et al., 2024 (Open Access: ) (Thread)

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Dani Barrera Guevara

@Barrerasaurus

3 months

Latitudinal Biogeographic Vicariance Hypothesis in Chasmosaurines. Were seaway transgressions and regressions responsible for the major branching events within the Chasmosaurs of the late Cretaceous? Maps based on Lillegraven & Ostresh, 1990.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Thysannia From what I was told by the discoverer -Jose Lopez Espinosa-, the head and scapula were under the tail. The crest was at first mistaken for the pubis because of its shape.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Riamus01 I suggest reading Wilson et al., 2020.

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Dani Barrera Guevara

@Barrerasaurus

3 months

Art by @GMonroyB1 (Life reconstruction portrait) and @PPaleoartist (Coahuilaceratops in its environment) !

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Dani Barrera Guevara

@Barrerasaurus

6 months

@SomniosusW Big

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Dani Barrera Guevara

@Barrerasaurus

5 months

@jimmadseni24 Left Frontal of Labocania anomala.

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Dani Barrera Guevara

@Barrerasaurus

4 months

How can we interpret this cladogram with a paraphyletic genus? The cladogenetic hypothesis requires many more assumptions to be the most parsimonious explanation. The anagenetic hypothesis requires fewer assumptions, and fits much better with the current evidence we have. (3/4)

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Dani Barrera Guevara

@Barrerasaurus

5 months

@jimmadseni24 Tooth of Labocania anomala. By Nicholas Longrich.

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Dani Barrera Guevara

@Barrerasaurus

4 months

Las dos diferentes hipótesis sobre la evolución de Daspletosaurus y Tyrannosaurini. Cladogénesis & Anagénesis Warshaw et al., 2024 (Acceso abierto: ) (Hilo)

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Thysannia Unprepped tail and femur of Tlatolophus galorum, at the Town Hall of General Cepeda, Coahuila, Mexico.

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Dani Barrera Guevara

@Barrerasaurus

1 year

First Tyranno Tooth of the season!

Denver Fowler Ph.D

@df9465

1 year

Obligatory tyrannosaurus tooth photo. First nice tooth of the season. We have one possible bone from the troodontid as well. Third day in the bone layer starting soon!

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Dani Barrera Guevara

@Barrerasaurus

4 months

We are not saying our hypothesis is correct, simply that the current evidence seems to indicate the anagenetic hypothesis. (4/4) Art by @GMonroyB1 !

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Dani Barrera Guevara

@Barrerasaurus

5 months

@jimmadseni24 Right Frontal of Nanuqsaurus (Dorsal View, F, G; Lateral View, H, I). Left Frontal of Carcharodontosaurid (Lateral View, A; Lateral View, C).

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Dani Barrera Guevara

@Barrerasaurus

6 months

@vLoM100 The truth will always be more interesting than fiction! It’s a definitely a Tyrannosaur!

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Dani Barrera Guevara

@Barrerasaurus

4 months

No estamos diciendo que nuestra hipótesis sea correcta, simplemente que la evidencia actual parece indicar la hipótesis anagenética. (4/4) Arte por @GMonroyB1 !

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Dani Barrera Guevara

@Barrerasaurus

5 months

@jimmadseni24 Quadrate of Labocania anomala.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Philoceratops @paleoduck I’ve seen and worked on the material in person. I can assure you it’s definitely an Ornithomimosaur. 🙂

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Dani Barrera Guevara

@Barrerasaurus

6 months

@AmmoniteSeries @ElReptileano @juacoraptor @TheDarknix @TheNewArtistGR @TPixel55 @Can0hh Ese Coahui se ve familiar. 🤔🤨

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Dani Barrera Guevara

@Barrerasaurus

6 months

@LiterallyMiguel @paleoduck Metatarsals! 🙂 Pedal anatomy is very important! The manual ungual also helps us ID this unusual ornithomimosaur.

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Dani Barrera Guevara

@Barrerasaurus

7 months

@Luismondkatze01 Does this count? Hahaha

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Dani Barrera Guevara

@Barrerasaurus

4 months

We made this figure to disseminate with the public what our hypothesis is about. Anagenesis (or phyletic evolution) is the evolution from one species to another without branching/splitting events. Only ancestor descendant relationships. (1/4)

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Dani Barrera Guevara

@Barrerasaurus

3 months

@PPaleoartist It came out amazing ! Thank you again!

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Riamus01 The proposed lineage would in fact start all the way from Styracosaurus to Pachyrhinosaurus!

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Dani Barrera Guevara

@Barrerasaurus

5 months

@Mr_Troodon It’s heavily taphonomically distorted. It wouldn’t have looked like this in life. 🙂

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Dani Barrera Guevara

@Barrerasaurus

6 months

@CamusAltamirano Ya estufas!

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Dani Barrera Guevara

@Barrerasaurus

7 months

@Luismondkatze01 This specimen is missing the postorbital boss. Did not reconstruct any of the missing elements.

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Dani Barrera Guevara

@Barrerasaurus

5 months

@MarkusBhler10 You are very right. Hahaha. I forgot how much soft tissue these guys have around the mouth.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Thysannia No. Only the skull has been published and studied so far.

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Dani Barrera Guevara

@Barrerasaurus

4 months

¿Cómo podemos interpretar este cladograma con un género parafilético? La hipótesis cladogenética requiere más suposiciones para ser la explicación más parsimoniosa. La hipótesis anagenéticarequiere menos asunciones y encaja con la evidencia actual que tenemos. (3/4)

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Dani Barrera Guevara

@Barrerasaurus

3 months

@JoshuaC42036662 @SomniosusW @df9465 @paleoduck Here we call it the Northern Pentaceratops lineage.

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Dani Barrera Guevara

@Barrerasaurus

3 months

@JosedrawingHD Nunca lo fue! Una revisión de la litología y geología de su localidad revela que es de la formación Cerro Huerta del Maastrichtiano temprano. Esta formación superposiciona al Cerro de Pueblo. Es decir, Coahuilaceratops nunca vivió con Velafrons y compañía.

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Dani Barrera Guevara

@Barrerasaurus

4 months

@deinotastic You know what. Yeah, let me double check the size on this one…

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Dani Barrera Guevara

@Barrerasaurus

3 months

@Corathus @df9465 @paleoduck Yes! Part of the “Northern Pentaceratops lineage” (in yellow).

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Dani Barrera Guevara

@Barrerasaurus

4 months

An anagenetic lineage will be represented as a paraphyletic group (successive steps along a tree, as seen in Daspletosaurus) within a phylogeny. A phylogenetic analysis is unable to produce ancestor and descendant relationships as it only produces cladogenetic hypotheses. (2/4)

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Thysannia I am going to post my newest Velafrons skeleton soon enough. 😁 Both have partially complete postcranial elements which differ. Velafrons being a juvenile, of course.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Philoceratops @Thysannia How does the head end up under the tail? How does the scapula end up under the tail? How does the tail stay articulated? Where are the ossified tendons? So many questions…

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Dani Barrera Guevara

@Barrerasaurus

4 months

Realizamos esta figura para difundir con el público de qué se trata nuestra hipótesis. La anagénesis (o evolución filética) es la evolución de una especie a otra sin eventos de ramificación. Sólo relaciones de ancestros y descendientes. (1/4)

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Dani Barrera Guevara

@Barrerasaurus

6 months

@KrzysztofS1986r @paleoduck I do not work for free, and I’m currently not taking any requests. 🙂 However, I will be taking commissions soon. If you’d like to commission either of these taxa (or both!) the opportunity will shortly be available. 🦖🦴

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Dani Barrera Guevara

@Barrerasaurus

7 months

@justwhaletingz @CoastalPaleo I’m going to be posting a lot more cetacean skeletons! C. planifrons, L. melvellei, P. macrocephalus, N. reimaea. Just to name a few. 😊

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Dani Barrera Guevara

@Barrerasaurus

6 months

@AndrGabrielGar2 Viva México! Viva!!! Ahí voy a postear todos los dinos de México pronto. Ya los verás!

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Dani Barrera Guevara

@Barrerasaurus

6 months

@derpystego I’ve always been told 12 cervicals with around 15 to 18 dorsals, with high variance in sacrals. 🙂 Since we don’t have a complete vertebral sequence for any of these taxa (Velafrons, Magnapaulia, etc), I wouldn’t know for certain. Thanks for bringing that up though.

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Dani Barrera Guevara

@Barrerasaurus

4 months

@Anax_TheJunius As long as it’s not for commercial uses and you credit me. I am more than happy!

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Dani Barrera Guevara

@Barrerasaurus

3 months

@ElReptileano Claro 🙌

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Dani Barrera Guevara

@Barrerasaurus

6 months

@TheAntiAzdarcho I recognized it from a mile away. A little credit goes a long ways. 😊 And thank you. I’ll be posting some more soon. 🙂

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Dani Barrera Guevara

@Barrerasaurus

6 months

@JosedrawingHD @paleoduck Labocania is pretty big. 😮 Perhaps, bigger than Duckie here.

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Dani Barrera Guevara

@Barrerasaurus

7 months

@Luismondkatze01 And hopefully, there will be more Daspletosaurus news later this year. 😄

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Dani Barrera Guevara

@Barrerasaurus

6 months

@reelxis maybe cory, is just beta magnapaulia 🤔

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Dani Barrera Guevara

@Barrerasaurus

7 months

@justwhaletingz @CoastalPaleo I’m taking requests at the moment. So I’ll add it to the list of possibilities.

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Dani Barrera Guevara

@Barrerasaurus

5 months

@derpystego @Mateusz192006 I never really understand his comments. 😅😵‍💫

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Dani Barrera Guevara

@Barrerasaurus

6 months

@justwhaletingz Yaaaay! Thank you! It means a lot 😁

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Paleonyx_Art Facts.

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Dani Barrera Guevara

@Barrerasaurus

4 months

Un linaje anagenético será representado como un grupo parafilético (escalones sucesivos a lo largo de un árbol) dentro de una filogenia. Un análisis filogenético no puede producir relaciones de ancestros y descendientes ya que solo produce hipótesis cladogenéticas. (2/4)

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Dani Barrera Guevara

@Barrerasaurus

6 months

@LeviBernardo13 Muchas teinkyus 😃😄😁

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Dani Barrera Guevara

@Barrerasaurus

5 months

@derpystego Hahaha it’s something we’re working on. Yes. Soon to be submitted for review. 👀 Or at SVP…

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Dani Barrera Guevara

@Barrerasaurus

6 months

@leguanx @paleoduck Ornithomimosaurs are easily differentiated on the basis of manual and pedal material, especially the metatarsals. Which is most of the material this guy is made up from. 😁

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Eadweardz no me la container

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Dani Barrera Guevara

@Barrerasaurus

5 months

@TPixel55 En el artículo de descripción mencionan que se encontraba en el dorso, así que lo hice como decía. Pero puede que si sea como Edmontonia o Nodosaurus.

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Dani Barrera Guevara

@Barrerasaurus

5 months

@Thysannia @Mr_Troodon I’m also just posting my old artwork. I no longer have the original file for me to cleanly remove the silhouette. If you want to remove the silhouette yourself, feel free to do so. 😄😃

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Dani Barrera Guevara

@Barrerasaurus

6 months

@HodariNundu @kuzim_za Ya rugiste

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Zegh8578 I think I might’ve summoned Cthulhu trying to pronounce it… whoops.

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Dani Barrera Guevara

@Barrerasaurus

6 months

@Eadweardz Ahuevito con catsup. Como dice la chaviza.

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Dani Barrera Guevara

@Barrerasaurus

5 months

@jimmadseni24 Labocania actually has more material than Nanuqsaurus. 🙂 However, regarding other theropods from Baja California. I know of none published.

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Dani Barrera Guevara

@Barrerasaurus

3 months

@Phorusrhacid We think that CMN 8800 is a representative of the Pentaceratops lineage. You can see a summarized and easy to digest version of our paper here:

Mexican Dinosaur A Game-Changer in Triceratops Evolution | Evolution...

When people discuss ideas of how terrestrial Mesozoic vertebrate ecosystems changed over time, the most often brought up examples are the major transitions t...

www.youtube.com

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Dani Barrera Guevara

@Barrerasaurus

6 months

@TheAntiAzdarcho This one looks familiar. 😮🙂

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Dani Barrera Guevara

@Barrerasaurus