A spinosaurid from Thailand (Sao Khua Formation, Early Cretaceous) and a reassessment of<i>Camarillasaurus cirugedae</i>from the Early Cretaceous of Spain

Samathi, Adun; Sander, P. Martin; Chanthasit, Phornphen

doi:10.1080/08912963.2021.1874372

Cited by 25 publications

(36 citation statements)

References 58 publications

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“…7), indicating an unstable position within Spinosauridae. Elsewhere, the recovery of Camarillasaurus as a spinosaurine (originally described as a ceratosaur 85 ), lends further support to recently published reinterpretations of this taxon's systematic position 61,76,86 . This interpretation may help explain the presence of spinosaurine-like teeth recovered from the same deposits 58 .…”

Section: Phylogenetic Analysessupporting

confidence: 68%

“…Despite this, numerous Jurassic and Cretaceous dinosaur assemblages include two or more comparably sized, morphologically similar, sympatric theropods 67 ; examples are present in various geological formations worldwide (e.g., 21,[68][69][70][71][72][73][74][75] ). The presence of two or more spinosaurid taxa in the same geological unit is therefore not without precedent and may in fact be typical 76 -the above mentioned Early Cretaceous of Iberia appears to testify this diversity. Indeed, when present, spinosaurids may have been locally abundant, perhaps when environmental circumstances benefited their specialised niche 11,20 , a feature potentially driving high diversity within the clade.…”

Section: Bayesian Analysis Thementioning

confidence: 99%

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New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae

Barker

Hone

Naish

et al. 2021

Sci Rep

105

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Spinosaurids are among the most distinctive and yet poorly-known of large-bodied theropod dinosaurs, a situation exacerbated by their mostly fragmentary fossil record and competing views regarding their palaeobiology. Here, we report two new Early Cretaceous spinosaurid specimens from the Wessex Formation (Barremian) of the Isle of Wight. Large-scale phylogenetic analyses using parsimony and Bayesian techniques recover the pair in a new clade within Baryonychinae that also includes the hypodigm of the African spinosaurid Suchomimus. Both specimens represent distinct and novel taxa, herein named Ceratosuchops inferodios gen. et sp. nov. and Riparovenator milnerae gen. et sp. nov. A palaeogeographic reconstruction suggests a European origin for Spinosauridae, with at least two dispersal events into Africa. These new finds provide welcome information on poorly sampled areas of spinosaurid anatomy, suggest that sympatry was present and potentially common in baryonychines and spinosaurids as a whole, and contribute to updated palaeobiogeographic reconstructions for the clade.

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Section: Phylogenetic Analysessupporting

confidence: 68%

Section: Bayesian Analysis Thementioning

confidence: 99%

New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae

Barker

Hone

Naish

et al. 2021

Sci Rep

105

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“…The first taxon of Spinosauridae described from the Iberian Peninsula, Vallibonavenatrix cani Malafaia et al, 2020 [ 6 ], was established on the basis of cervical, dorsal, sacral, and caudal elements, with fragments of ribs, chevrons, and a relatively complete pelvic girdle; their analysis placed it within Spinosaurinae. Camarillasaurus cirugedae Sánchez-Hernández & Benton, 2012 [ 40 ] was originally regarded as a ceratosaur but has now been suggested to be a megalosauroid, with probable spinosaurid affinities [ 8 , 41 ]. For a more extended overview of Iberian Spinosauridae, as well as a detailed catalog of material, see [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

A new theropod dinosaur from the early cretaceous (Barremian) of Cabo Espichel, Portugal: Implications for spinosaurid evolution

Mateus

Estraviz-López

2022

PLoS ONE

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Spinosaurids are some of the most enigmatic Mesozoic theropod dinosaurs due to their unique adaptations to aquatic environments and their relative scarcity. Their taxonomy has proven to be especially problematic. Recent discoveries from Western Europe in general, specifically Iberia, provide some of the best specimens for the understanding of their phylogeny, leading to the description of the spinosaurid Vallibonavenatrix cani and the recognition of the Iberian dinosaur Camarillasaurus cirugedae as one of them. Portuguese associated spinosaurid remains (ML1190) from the Papo Seco Formation (early Barremian) were previously assigned to Baryonyx walkeri but new material recovered in 2020 along with new phylogenetic analyses suggests a different phylogenetic placement, making their revision necessary. Here we show that these remains are not attributable to Baryonyx walkeri, but to a new genus and species, Iberospinus natarioi, gen. et sp. nov. The new taxon is characterized by the presence of a single Meckelian foramen in the Meckelian sulcus, a straight profile of the ventral surface of the dentary and a distal thickening of the acromion process of the pubis between other characters. Iberospinus natarioi is recovered as a sister taxon of the clade formed by Baryonyx and Suchomimus, and outside Spinosaurinae when Vallibonaventrix cani is excluded from the analysis. The description of this taxon reinforces Iberia as a hotspot for spinosaur biodiversity, with several endemic taxa for the region. As expected for the clade, the dentary displays a highly vascularized neurovascular network. The morphometric analysis of parts of the skeleton (pedal phalanx and caudal vertebrae, among others) shows an intermediate condition between basal tetanurans and spinosaurines.

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“…If the hip height/footprint length ratio of 4 is applied, the hip height of the Las Hoyas trackmaker proves to be 104–112 cm, which is a similar value to that calculated for the tracks of La Torre 6A (119–144 cm) and La Torre 6B (110–121 cm). Finally 3) ceratosaurian theropods have been included as components of Early Cretaceous Iberian theropod biodiversity, but Camarillasaurus cirugedae is currently regarded as a spinosaurid and no longer as a ceratosaur 51 , 52 . In addition to Camarillasaurus , the presence of ceratosaurians in the Late Jurassic of Portugal has been suggested on the basis of isolated teeth 53 , 54 and dental remains of cf.…”

Section: Resultsmentioning

confidence: 99%

Fast-running theropods tracks from the Early Cretaceous of La Rioja, Spain

Navarro-Lorbés

Ruíz

Díaz‐Martínez

et al. 2021

Sci Rep

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Theropod behaviour and biodynamics are intriguing questions that paleontology has been trying to resolve for a long time. The lack of extant groups with similar bipedalism has made it hard to answer some of the questions on the matter, yet theoretical biomechanical models have shed some light on the question of how fast theropods could run and what kind of movement they showed. The study of dinosaur tracks can help answer some of these questions due to the very nature of tracks as a product of the interaction of these animals with the environment. Two trackways belonging to fast-running theropods from the Lower Cretaceous Enciso Group of Igea (La Rioja) are presented here and compared with other fast-running theropod trackways published to date. The Lower Cretaceous Iberian fossil record and some features present in these footprints and trackways suggest a basal tetanuran, probably a carcharodontosaurid or spinosaurid, as a plausible trackmaker. Speed analysis shows that these trackways, with speed ranges of 6.5–10.3 and 8.8–12.4 ms−1, testify to some of the top speeds ever calculated for theropod tracks, shedding light on the question of dinosaur biodynamics and how these animals moved.

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A spinosaurid from Thailand (Sao Khua Formation, Early Cretaceous) and a reassessment ofCamarillasaurus cirugedaefrom the Early Cretaceous of Spain

Cited by 25 publications

References 58 publications

New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae

New spinosaurids from the Wessex Formation (Early Cretaceous, UK) and the European origins of Spinosauridae

A new theropod dinosaur from the early cretaceous (Barremian) of Cabo Espichel, Portugal: Implications for spinosaurid evolution

Fast-running theropods tracks from the Early Cretaceous of La Rioja, Spain

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