PubHawk
PeerJ October 2015 PMID 26500829

A reappraisal of the morphology and systematic position of the theropod dinosaur Sigilmassasaurus from the "middle" Cretaceous of Morocco.

Serjoscha W Evers, Oliver W M Rauhut, Angela C Milner, Bradley McFeeters, Ronan Allain

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Mentions

77
Peak: 13 in May 2020
across 5 sources since Aug 2016

Extended reach

96,588
potential audience

Total likes

752

Video views

29,372

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Aug 2016 – Dec 2025

Where it's discussed

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AI synopsis

What people are saying

Discussions reveal a strong interest in recent fossil re-evaluations, with users emphasizing the importance of morphology and systematic analysis, as seen in references to the debate over vertebral parts and species synonyms. The tone varies from supportive to critical, reflecting engagement with the scientific process and its implications for dinosaur taxonomy.

AgreementModerate agreement

Most discussions seem to support or acknowledge the study's findings and clarifications regarding Sigilmassasaurus, with some users referencing previous debates and older classifications.

InterestHigh interest

The posts show a high level of curiosity and enthusiasm for dinosaur classification, fossil comparisons, and the re-evaluation of species, indicating strong interest.

EngagementModerate engagement

Participants reference detailed fossil evidence, methods, and past research, reflecting active engagement and a desire to understand the scientific nuances.

ImpactModerate impact

The discussions highlight that the research could influence future classifications and taxonomic clarity, implying a moderate but meaningful impact on the field.

Abstract in brief

  • This study reevaluates Sigilmassasaurus brevicollis, a theropod dinosaur from Morocco's Late Cretaceous, which was previously considered uncertain in its classification, with debates over whether it was related to carcharodontosaurids, ornithischians, or spinosaurids.
  • New fossil remains and detailed comparisons suggest that earlier identified vertebrae are actually parts of different positions in the vertebral column, and the original holotype was an anterior dorsal vertebra, not a cervical. The study finds key features (autapomorphies) that support Sigilmassasaurus as a valid genus, showing it has unique traits among spinosaurids.
  • The researchers also argue that Spinosaurus maroccanus, originally described from similar fossils, is essentially the same species as Sigilmassasaurus, making it a subjective synonym, which means both names refer to the same dinosaur.]
Read the full abstract

Top posts

Most liked on X and Bluesky
中島保寿（古生物学者）
@japanfossil · X

シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸は短くないようです。 https://t.co/H6xZ7CEY7u

May 4, 2020 · 21 likes · 9 shares · 17,601 followers View post →
Serjoscha Evers
@SirJoscha · X

As outlined in our "Association of remains of the ‘neotype’" section in our 2015 Sigilmassasaurus paper (https://t.co/xQw90OzLX0), we were critical of the association of FSAC-KK 11888 because of the limb proportions and lack of proper site documentation. 3/n

Apr 30, 2020 · 11 likes · 2 shares · 2,245 followers View post →
RIAMUS - commissions open again!
@Riamus01 · X

RT @SirJoscha: As outlined in our "Association of remains of the ‘neotype’" section in our 2015 Sigilmassasaurus paper (https://t.co/xQw90O…

May 2, 2020 · 2 shares · 28,463 followers View post →
JH
@JHemiptera · X

RT @pantheo27705718: モロッコ"中期"白亜紀の獣脚類シギルマッササウルスの形態学及び系統的位置の再評価 固有派生形質のいくつかは他のスピノサウルス類にも共通することがわかったが、属の有効性は認めている。論文 https://t.co/nPRqBEJjmG h…

May 23, 2020 · 11 shares · 4,050 followers View post →
田中順也@古生物のしたたかな生き方
@tanituki · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 2,156 followers View post →
とよけらとぷす
@rex_toyo · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 2,153 followers View post →

All mentions

Spinoりん
@Spino_Rin · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

Mar 3, 2025 · 9 shares · 1,929 followers View post →
ネム
@Nem_spinosaurus · X

RT @SirJoscha: Contrasting my daily #turtle work w/ cervical & ant dorsal verts of #dinosaur Baryonyx for #FossilFriday We published a re-i…

Jan 7, 2022 · 10 shares · 722 followers View post →
KirbyDD’s EPIC Paleontology Account
@KirbyDDPaleo · X

https://t.co/Dc6Ja8G0Oo

Jun 1, 2021 · 65 followers View post →
高光暎
@AkiraTakahikaru · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

Jan 24, 2021 · 9 shares · 247 followers View post →
ベルツリー⊿
@belltree_33 · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 23, 2020 · 9 shares · 678 followers View post →
白亜
@hakua_raptlord · X

RT @pantheo27705718: モロッコ"中期"白亜紀の獣脚類シギルマッササウルスの形態学及び系統的位置の再評価 固有派生形質のいくつかは他のスピノサウルス類にも共通することがわかったが、属の有効性は認めている。論文 https://t.co/nPRqBEJjmG h…

May 23, 2020 · 11 shares · 732 followers View post →
JH
@JHemiptera · X

RT @pantheo27705718: モロッコ"中期"白亜紀の獣脚類シギルマッササウルスの形態学及び系統的位置の再評価 固有派生形質のいくつかは他のスピノサウルス類にも共通することがわかったが、属の有効性は認めている。論文 https://t.co/nPRqBEJjmG h…

May 23, 2020 · 11 shares · 4,050 followers View post →
とよけらとぷす
@rex_toyo · X

RT @pantheo27705718: モロッコ"中期"白亜紀の獣脚類シギルマッササウルスの形態学及び系統的位置の再評価 固有派生形質のいくつかは他のスピノサウルス類にも共通することがわかったが、属の有効性は認めている。論文 https://t.co/nPRqBEJjmG h…

May 23, 2020 · 11 shares · 2,153 followers View post →
田中順也@古生物のしたたかな生き方
@tanituki · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 2,156 followers View post →
d_i_s
@disk_1981 · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 830 followers View post →
とよけらとぷす
@rex_toyo · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 2,153 followers View post →
あの日、ミッに呼ばれたかもしれない
@anohimihakuseki · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 1,011 followers View post →
とげとかげ
@BSP1912VIII19 · X

RT @japanfossil: シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸…

May 4, 2020 · 9 shares · 1,201 followers View post →
中島保寿（古生物学者）
@japanfossil · X

シギルマッササウルスは頸椎〜前部胴椎しか見つかっておらず、頭・肢・尾の形態、背中の帆の有無については全く不明で、スピノサウルス科かどうかも未定です。ただ以前頸椎とされていたものが胴椎だったこともわかり、学名（brevicollis）が示すほど頸は短くないようです。 https://t.co/H6xZ7CEY7u

May 4, 2020 · 21 likes · 9 shares · 17,601 followers View post →
RIAMUS - commissions open again!
@Riamus01 · X

RT @SirJoscha: As outlined in our "Association of remains of the ‘neotype’" section in our 2015 Sigilmassasaurus paper (https://t.co/xQw90O…

May 2, 2020 · 2 shares · 28,463 followers View post →
Kabir Chatterjee
@Logicoraptor · X

RT @SirJoscha: As outlined in our "Association of remains of the ‘neotype’" section in our 2015 Sigilmassasaurus paper (https://t.co/xQw90O…

Apr 30, 2020 · 2 shares · 141 followers View post →
Serjoscha Evers
@SirJoscha · X

As outlined in our "Association of remains of the ‘neotype’" section in our 2015 Sigilmassasaurus paper (https://t.co/xQw90OzLX0), we were critical of the association of FSAC-KK 11888 because of the limb proportions and lack of proper site documentation. 3/n

Apr 30, 2020 · 11 likes · 2 shares · 2,245 followers View post →
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Hello guys i got actually a couple question regarding C.Saharicus ...
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Jun 2, 2020 View →
Spinosaurus species reclassified in new study
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

May 23, 2020 View →
Spinosaurus reconstruction (c. 2020)
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

May 4, 2020 View →
Spinosaurus had changed form! Repeat
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Apr 29, 2020 View →
Spinosaurus aegyptiacus build accuracy and reconstructions
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Aug 9, 2019 View →
Is Sigilmassasaurus a valid genus after all?
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Jan 2, 2019 View →
November 7, 1910, German paleontologist Ernst Stromer arrives in ...
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Nov 7, 2018 View →
What's the latest on Spinosaurus research?
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PeerJ 3:e1323 https://dx.doi. org/10.7717/peerj.1323. A reappraisal of the morphology and systematic position of the theropod dinosaur ...

Aug 20, 2018 View →
New open access paper on Chrysomelidae: This one is about Costa ...
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... 1323 specimens of X. globicipitis collected from 54 ... PeerJ 6:e4793; DOI 10.7717/peerj.4793. No photo description available ...

May 29, 2018 View →
Native brazilian forest snail STROPHOCHEILIDAE "Gonyostomus ...
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The Neotropical land snails (Mollusca, Gastropoda) collected by the 'Comisión Científica del Pacífico'. PeerJ. 5. 10.7717/peerj.3065. # ...

Aug 13, 2016 View →