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Vahe Demirjian
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Vahe D. Demirjian


Summary

I was born in Oakland, California, on February 3, 1991. I was raised in Alamo from 1991 to 2002, staying on Via Romero and later Serafix Road until I moved to Newport Coast in southern California.

Paleontology

Editing Journals


Websites

  • Sauropoda Central

PeerJ Contributions

  • Feedback 53
  • Questions 1

Provided feedback on

1 vote
05 May 2017

The fragile legacy of Amphicoelias fragillimus (Dinosauria: Sauropoda; Morrison Formation - Latest Jurassic)

Osborn and Mook (1921) actually synonymize Amphicoelias latus with Camarasaurus supremus, but Carpenter (1998) considers it a synonym of Camarasaurus grandis because it was found l...

1 vote
24 May 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Pitekunsaurus and Muyelensaurus are recovered as members of Aeolosaurini in the original description of Overosaurus by Coria et al. (2013), yet your paper recovers the two genera a...

1 vote
20 Jul 2017

A Tyrannosauroid Metatarsus from the Merchantville Formation of New Jersey increases the diversity of non-Tyrannosaurid Tyrannosauroids on Appalachia

Hi Chase, The specimen AMNH 2550-2553 you mention was originally assigned to the ornithomimosaur Coelosaurus antiquus by Leidy (1865), only to be later made the holotype of the...

1 vote
24 May 2018

The palate and choanae structure of the cf. Susisuchus (Crocodyliformes, Eusuchia): phylogenetic implications

Hi, With respect to the cladogram, the allodaposuchid Allodaposuchus subjuniperus has been re-assigned to the new genus Agaresuchus by Narváez et al. (2016), while Theriosuchus...

30 Sep 2015

Comments on the juvenile Megaraptor specimen and systematic positions of megaraptoran theropods

Hi Yun, Bell et al. (2016) report a new megaraptoran specimen from Australia, and their cladistic analyses test the carcharodontosaurian and tyrannosauroid placements of Megarap...

04 Oct 2015

Insight on the anatomy, systematic relationships, and age of the Early Cretaceous ankylopollexian dinosaur Dakotadon lakotaensis

Hi, As you are no doubt aware, NHMUK R.3741 and NHMUK R.1831 have been named Mantellodon and Darwinsaurus respectively by Paul (2012). Gregory S. Paul (2012). "Notes on the...

06 Oct 2015

Almost all known sauropod necks are incomplete and distorted

Hi Taylor, I was kind of surprised to see that only a handful of specimens of sauropod species have complete necks. Regarding Giraffatitan, you didn't mention that the reclassif...

09 Oct 2015

The neck of Barosaurus was not only longer but also wider than those of Diplodocus and other diplodocines

Hi, Since Tschopp et al. (2015) refer AMNH 7535 to Barosaurus and AMNH 7530 and SMA D16-3 to Kaatedocus, it may be imperative to update the paper by Taylor and Wedel to take int...

11 Oct 2015

Almost all known sauropod necks are incomplete and distorted

Hi Mike, I forgot to mention that the following Camarasaurus (or camarasaurid specimens) have complete or near-complete necks: 1. SMA 002 (referred to Cathetosaurus lewisi in...

16 Oct 2015

Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex

With respect to juvenile tyrannosaurs found in Lancian-age strata in western North America besides CMNH 7541 and Jane, Snively and Longrich (2009) report on an undescribed juvenile...

22 Nov 2015

A new Lower Triassic ichthyopterygian assemblage from Fossil Hill, Nevada

One of the papers by Ji et al. has now been published --- the citation for this paper is as follows: Cheng Ji, Da-Yong Jiang, Ryosuke Motani, Olivier Rieppel, Wei-Cheng Hao & Zu...

19 Jan 2016

Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex

Hi Yun, A new paper by Schmerge and Rothschild (2016) claims that Nanotyrannus is not just distinct from T. rex, but also an albertosaurine because CMNH 7541, Jane, and BHI 6437...

22 Jul 2016

Redescription of Arundel formation Ornithomimosaur material and a reinterpretation of Nedcolbertia justinhofmanni as an “Ostrich Dinosaur”: Biogeographic implications

Hi Chase, The correct name for "Ornithomimus" affinis should be "Dryosaurus" grandis Lull, 1911. The truth of the matter is that Gilmore (1920) coined Ornithomimus affinis as a...

25 Nov 2016

A review of dinosaurian body fossils from British Columbia, Canada

Hi, The Schott and Evans paper cited in the references section is now published: Schott, R. K. and Evans, D. C. (2016), Cranial variation and systematics of Foraminacephale b...

29 Jan 2017

A new reconstruction of Struthiosaurus austriacus Bunzel 1871

Due to the description of Hungarosaurus and Struthiosaurus languedocensis, it's arguable whether all non-osteoderm, non-cranial material can be assigned to S. austriacus because of...

08 Apr 2017

Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex

Carr et al. (2017) note that the pneumatic foramen on the quadratojugal that Larson (2013) used to distinguish Nanotyrannus from T. rex is also present in Daspletosaurus horneri an...

24 May 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

The femur FMNH 13020 labeled as Argyrosaurus ?superbus? has been referred to Titanosauria indet. by Mannion and Otero (2012). Also, the results of the SVP abstract by Tschopp et al...

24 May 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, I forgot to mention that the euhelopodid classification of Daxiatitan by D'Emic (2012) is questioned by Mannion et al. (2013) and Poropat et al. (2016), who recover Daxiatit...

26 May 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Brachiosaurus spp. should read Brachiosaurus altithorax in the cladogram due to the erection of Lusotitan for Brachiosaurus atalaiensis. Also, Baotianmansaurus and Dongyangosaurus...

05 Jun 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

If you have an opportunity, you might want to scrutinize the original description of the Maastrichtian form Qinlingosaurus by Xue et al. (1996) to see how it compare with Ruyangosa...

14 Jul 2017

Reevaluation of the largest published morphological data matrix for phylogenetic analysis of Paleozoic limbed vertebrates

A new paper on Lethiscus by Pardo et al. (2017) recovers Aistopoda as stem-tetrapods, while recovering microsaurs and lysorophians as amniotes. In particular, their cladistic analy...

07 Aug 2017

New specimen and revision of the late Jurassic teleosaurid 'Steneosaurus’ megarhinus

Now that Steneosaurus obtusidens is now renamed Lemmysuchus, "Steneosaurus" megarhinus should be entered into the data matrix for Johnson et al. (2017) to test the phylogenetic hyp...

20 Sep 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Simon et al. (in press) describe the new Patagonian titanosaur Choconsaurus baileywillisi from the Huincul Formation (from which Argentinosaurus hails). Because Choconsaurus is rec...

04 Nov 2017

Theropod specimens from the Navesink Formation and their implications for the Diversity and Biogeography of Ornithomimosaurs and Tyrannosauroids on Appalachia

Hi Chase, The statement in the abstract "This landmass, isolated from the western landmass Laramidia by a great inland sea known as the Western Interior Seaway, may have been a...

04 Nov 2017

Theropod specimens from the Navesink Formation and their implications for the Diversity and Biogeography of Ornithomimosaurs and Tyrannosauroids on Appalachia

Hi Chase, I know you mentioned ornithomimosaur pedal phalanges from the Atlantic Coastal Plain that are more robust than AMNH 2551, 2552, and 2553, but Tsogtbaatar et al. (2018)...

05 Nov 2017

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, Currie et al. (in press) report the relocation of the Nemegtosaurus holotype quarry and describe newly discovered postcranial remains from the Nemegtosaurus type locality th...

31 Dec 2017

A new reconstruction of Struthiosaurus austriacus Bunzel 1871

The description of the Borealopelta armor should help you further with your paper on Struthiosaurus: Brown, C. M. (2017). "An exceptionally preserved armored dinosaur reveals th...

06 Jan 2018

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, The new somphospondylan Sibirotitan (Averianov et al., in press) should be added to the matrix because the cladistic analysis of Sibirotitan is noteworthy for hewing closely...

19 Jan 2018

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi Gunnar, A new paper is available online that will help with data matrices for lognkosaurians, rinconsaurians, and aeolosaurs: Bernardo J. Gonzàlez Riga; Philip D. Mannion;...

22 Jan 2018

­Postcranial skeletal anatomy of the holotype and referred specimens of Buitreraptor gonzalezorum Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia

Hi, With respect to the Buitreraptor cladistic analysis: 1. Mahakala is placed with Halszkaraptor and Hulsanpes in the new dromaeosaur subfamily Halszkaraptorinae, which is r...

29 Jan 2018

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, Sallam et al. (2018) describe the youngest African sauropod, Mansourasaurus, from the Campanian-age Quseir Formation of the Dakhla Oasis, Egypt. Because Mansourasaurus is re...

07 Feb 2018

Theropod specimens from the Navesink Formation and their implications for the Diversity and Biogeography of Ornithomimosaurs and Tyrannosauroids on Appalachia

Hi, Given that the Teihivenator syntype AMNH 2550 is recovered as a relative of Bistahieversor by Brownstein (in press), I think you might want to discuss how AMNH 2550 compares...

10 Feb 2018

­Postcranial skeletal anatomy of the holotype and referred specimens of Buitreraptor gonzalezorum Makovicky, Apesteguía and Agnolín 2005 (Theropoda, Dromaeosauridae), from the Late Cretaceous of Patagonia

I thought you might use the dataset of Guo et al. (2018) to see if the results of your analysis are any different or similar with respect to the Brusatte et al. and Cau et al. data...

23 Feb 2018

Theropod hindlimbs with feeding and other traces reveal ecosystem dynamics in the Maastrichtian of eastern North America

Hi Chase, It's quite surprising to see that large neosuchians preyed upon large theropods in Appalachia the latest Cretaceous, but the name _"Struthiomimus" sedens_ you mentione...

28 Jun 2018

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Diez Diaz et al. (2018) recovers _Atsinganosaurus_, _Lirainosaurus_, and _Ampelosaurus_ in a clade within Lithostrotia that they name Lirainosaurinae (_Lohuecotitan_ and _Paludtita...

22 Oct 2018

The fragile legacy of Amphicoelias fragillimus (Dinosauria: Sauropoda; Morrison Formation - Latest Jurassic)

Hi, Carpenter (2018) has reclassified Amphicoelias fragillimus as a rebbachisaurid and erected Maraapunisaurus for it based on comparisons with known rebbachisaurids. Andrea Cau...

03 Nov 2018

Almost all known sauropod necks are incomplete and distorted

Hi, Zhang et al. (2019) report that the _Xinjiangtitan_ holotype preserves a complete cervical series based on new preparation of the holotype, and the holotype of _Lavocatisaur...

06 Nov 2018

Reproducibility in phylogenetics: reevaluation of the largest published morphological data matrix for phylogenetic analysis of Paleozoic limbed vertebrates

Hi, A new paper is available online: Rainer R. Schoch (2018). The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls. Journal of Pal...

07 Dec 2018

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Averianov and Efimov (2018) describe the new lithostrotian _Volgatitan simbirskiensis_ from the Early Cretaceous of the Volgograd region in European Russia, the first ever dinosaur...

21 Dec 2018

A review of dinosaurian body fossils from British Columbia, Canada

Hi, With respect to the Pachycephalosauria phylogenetic analysis, Evans et al. (2018) describe new pachycephalosaur specimens from the Nemegt Formation, including a juvenile the...

14 Jan 2019

Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex

An SVP 2018 abstract by Burnham et al. (2018) reports that a juvenile T. rex specimen (KUVP 156375) found in Montana has the same maxillary count as adult T. rex (12 maxillary teet...

04 Feb 2019

Almost all known sauropod necks are incomplete and distorted

Hi Mike, While reading the paper by Gallina et al. (2019) describing the new dicraeosaurid _Bajadasaurus_, I was dumbstruck to find out that _Amargasaurus_ preserves a complete...

13 Feb 2019

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Gorscak and O'Connor (2019) describe the new lithostrotian titanosaur _Mnyamawamtuka_ from the mid-Cretaceous Galula Formation of Tanzania, the third Cretaceous titanosaur to be na...

29 Mar 2019

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

The cladistic analysis of Filippi et al. (2019) recovers their new taxon _Kaijutitan_ as a sister taxon of _Epachthosaurus_ and Eutitanosauria. The analysis also recovers _Andesaur...

08 Jul 2019

The neck of Barosaurus: longer, wider and weirder than those of Diplodocus and other diplodocines

Hi Taylor, Given that you recently suggested that the traditionally referred _Supersaurus_ specimen BYU 9024 might belong to _Barosaurus_ based on comparisons with the cervical...

13 Jul 2019

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, Gonzalez-Riga et al. (2019) erect the name Colossosauria for the lithostrotian clade formed by Lognkosauria and Rinconsauria. Their cladistic analysis recovers Aeolosaurus a...

29 Aug 2019

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Mannion et al. (2019) recover Jiangshanosaurus and Dongyangosaurus outside Titanosauria but recover Daxiatitan and Xianshanosaurus inside Titanosauria as basal to Lithostrotia. Yon...

07 Nov 2019

A review of dinosaurian body fossils from British Columbia, Canada

Hi, The dinosaur specimen from British Columbia that Arbour and Graves (2008) assigned to Neornithischia indeterminate has been described as a new genus and species of leptocera...

11 Feb 2020

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Averianov and Lopatin (in press) describe a new titanosaur from the Late Cretaceous Alagteeg Formation of Mongolia, _Abdarainurus barsboldi_, on the basis of several caudal vertebr...

04 Jun 2020

Evidence points out that "Nanotyrannus" is a juvenile Tyrannosaurus rex

Carr (2020) has released a new paper on updates to knowledge of Tyrannosaurus rex ontogeny, including info on how maturity and decrease in tooth count are correlated in T. rex spec...

01 Sep 2020

A review of dinosaurian body fossils from British Columbia, Canada

Arbour et al. (2020) describe ankylosaur remains collected from the Cenomanian Dunvegan Formation in British Columbia in 1930. This material is considered too fragmentary to assign...

05 Sep 2020

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

A cladistic analysis by Royo-Torres et al. (2020) recovers Euhelopodidae within Titanosauria, and it also happens to recover _Huanghetitan_ and _'H.' ruyangensis_ in disparate phyl...

16 Aug 2021

The Chinese colossus: an evaluation of the phylogeny of Ruyangosaurus giganteus and its implications for titanosaur evolution

Hi, The phylogenetic analysis of _Ruyangosaurus_ should be updated yet again to reflect the following new developments in titanosaur phylogeny: 1. Poropat et al. (2021) erect...

1 Question

0
Would it be OK to use the name Thescelosauridae to accommodate not just Thescelosaurus, but also its closest relatives?
about The cranial anatomy of the neornithischian dinosaur Thescelosaurus neglectus