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1997
Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1997).  Couvée, oeufs et embryons d'un dinosaure théropode du Jurassique supérieur de Lourinhã (Portugal). Comptes Rendus de l'Académie des Sciences-Series IIA-Earth and Planetary Science. 325, 71–78., Number 1 Abstract
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Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1997).  Couvée, œufs et embryons d'un Dinosaure Théropode du Jurassique supérieur de Lourinhã (Portugal). Comptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes. 325, 71–78., Number 1 Abstract
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Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1997).  Couvée, øe}ufs et embryons d{\textquotesingle}un Dinosaure Théropode du Jurassique supérieur de Lourinha (Portugal). Comptes Rendus de l{\textquotesingle}Académie des Sciences - Series {IIA} - Earth and Planetary Science. 325, 71–78., jul, Number 1: Elsevier {BV} AbstractWebsite
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Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1997).  Couvée, oeufs et embryons d'un dinosaure théropode du Jurassique supérieur de Lourinhã (Portugal). C.R Acad. Sci. Paris, Sciences de la terre et des planetes. 325, 71-78., Jully, Number 1 Abstractmateus_et_al_1997_eggs_embryos_nest__couvee_oeufs_et_embryons_dun_dinosaure_theropode_du_jurassique_superieur_de_lourinha_portugal.pdfWebsite

Several well preserved clutches of dinosaurs have been discovered in the upper Kimmeridgian/ Tithonian of Lourinhã (Estramadur Province, Portugal). Some eggs of one clutch contained embryo elements of a theropod dinosaur. The egg-shell resembles that of eggs which have been discovered in the Upper Jurassic of Colorado

1998
Mateus, O., Taquet P., Antunes M. T., Mateus H., & Ribeiro V. (1998).  Theropod dinosaur nest from Lourinhã, Portugal. Journal of Vertebrate Paleontology. 18, 61., Number (Suppl. 3) Abstract
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Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1998).  Upper Jurassic Theropod Dinosaur embryos from Lourinhã (Portugal). Upper Jurassic paleoenvironments in Portugal, Mem. Acad. Ciências de Lisboa. 37, 101-109. Abstract
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Mateus, O., Taquet P., Antunes M. T., Mateus H., & Ribeiro V. (1998).  Theropod dinosaur nest from Lourinhã, Portugal. Journal of Vertebrate Paleontology. 18, 61A., Number (Suppl. 3) Abstractmateus_et_al_1998_theropod_dinosaur_nest_from_lourinha_portugal_svp.pdfWebsite

More than 100 well preserved dinosaur eggs have been discovered in the Upper Jurassic levels (Tithonian) of Lourinhã, Portugal. The eggshels dispersed in a big area with 11 meters in the highest diameter with high concentration in the middle.
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Mateus, I., Mateus H., Antunes M. T., Mateus O., Taquet P., Ribeiro V., & Manuppella G. (1998).  Upper Jurassic Theropod Dinosaur embryos from Lourinhã (Portugal). Mem. Acad. Ciências de Lisboa. 37, 101-109. Abstractmateus_et_al_1998_-_upper_jurassic_theropod_dinosaur_embryos_from_lourinha_portugal_-_upper_jurassic_palaeoenvironments_in_portugal_ed._....pdfWebsite

Upper Jurassic nesting site from Paimogo (Lourinhã, Portugal) yielded the oldest dinosaur theropod embryos ever found. Numerous bones, including skull bones, from the skeleton of these embryos have been collected. The study of bones and embryos offers the possibility to learn more on the early life of theropod dinosaurs.

1999
Allain, R., Taquet P., Battail B., Dejax J., Richir P., Veran M., Limon-Duparcmeur F., & et al (1999).  A new genus of sauropod dinosaur from the Gres superieurs formation (Aptian-Albian) of Laos. Comptes Rendus de l'Academie des Sciences Series IIA Earth and Planetary Science. 329, 609–616., Number 8 Abstract
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Allain, R., Taquet P., Battail B., Dejax J., Richir P., Véran M., Limon-Duparcmeur F., & et al (1999).  A new genus of sauropod dinosaur from the Gres superieurs formation (Aptian-Albian) of Laos | Un nouveau genre de dinosaure sauropode de la formation des Gres superieurs (Aptien-Albien) du Laos. Comptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes. 329, 609–616., Number 8 Abstract
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Allain, R., Taquet P., Battail B., Dejax J., Richir P., Véran M., Limon-Duparcmeur F., & et al (1999).  Un nouveau genre de dinosaure sauropode de la formation des Grès supérieurs (Aptien-Albien) du Laos. Comptes Rendus de l'Académie des Sciences-Series IIA-Earth and Planetary Science. 329, 609–616., Number 8 Abstract
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Allain, R., Taquet P., Battail B., Dejax J., Richir P., Veran M., Limon-Duparcmeur F., Vacant R., Mateus O., Sayarath P., Khenthavong B., & Phouyavong S. (1999).  Un nouveau genre de dinosaure sauropode de la formation des Gres superieurs (Aptien-Albien) du Laos. Comptes Rendus de l'Academie des Sciences - Series IIA - Earth and Planetary Science. 329, 609-616., oct, Number 8 Abstractallain_taquet_battail_dejax_richir_mateus_et_al_1999_un_nouveau_genre_de_dinosaure_sauropode_de_la_formation_des_gres_superieurs_aptien-albien_du_laos.pdfWebsite

The partly-articulated postcranial remains of two sauropod skeletons recently found in Tang Vay (Savannakhet Province, Laos) are assigned to the species Tangvayosaurus hoffeti (nov. gen., nov. sp.). The derived characters present in the new material confirm the presence of titanosaurs in South East Asia at the end of the Early Cretaceous, but are not consistent with its placement within Titanosaurus genus as first done by Hoffet in 1942. All of the material relative to this species is therefore referred to a new genus: Tangvayosaurus. Tangvayosaurus and the Thai genus Phuwiangosaurus have strong affinities and are considered as primitive titanosaurs.

Allain, R., Taquet P., Battail B., Dejax J., Richir P., Véran M., Limon-Duparcmeur F., Vacant R., Mateus O., Sayarath P., Khenthavong B., & Phouyavong S. (1999).  Un nouveau genre de dinosaure sauropode de la formation des Grès supérieurs (Aptien-Albien) du Laos. Comptes Rendus de l{\textquotesingle}Académie des Sciences - Series {IIA} - Earth and Planetary Science. 329, 609–616., oct, Number 8: Elsevier {BV} AbstractWebsite
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2001
Mateus, O., Antunes M. T., & Taquet P. (2001).  Dinosaur ontogeny : the case of Lourinhanosaurus (Late Jurassic, Portugal). J. Vertebr. Paleontol. 21, Abstract
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de Ricqlès, A., Mateus O., Antunes M. T., & Taquet P. (2001).  Histomorphogenesis of embryos of Upper Jurassic theropods from Lourinhã (Portugal). Comptes Rendus de l'Académie des Sciences-Series IIA-Earth and Planetary Science. 332, 647–656., Number 10 Abstract
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de Ricqlès, A., Mateus O., Antunes M. T., & Taquet P. (2001).  Histomorphogenesis of embryos of Upper Jurassic theropods from Lourinhã (Portugal) | Histomorphogenèse du squelette d'embryons de dinosaures théropodes du Jurassique supérieur de Lourinhã (Portugal). Comptes Rendus de l'Academie de Sciences - Serie IIa: Sciences de la Terre et des Planetes. 332, 647–656., Number 10 Abstract
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de Ricqlès, A., Mateus O., Antunes M. T., & Taquet P. (2001).  Histomorphogenesis of embryos of Upper Jurassic Theropods from Lourinha (Portugal). Comptes Rendus De L Academie Des Sciences Serie Ii Fascicule a-Sciences De La Terre Et Des Planetes. 332, 647-656., Jan Abstractricqles_mateus_et_al_2011_histomorphogenesis_of_embryos_of_upper_jurassic_theropods_from_lourinha_portugal.pdfWebsite

Remains of dinosaurian embryos, hatchlings and early juveniles are currently the subject of increasing interest, as new discoveries and techniques now allow to analyse palaeobiological subjects such as growth and life history strategies of dinosaurs. So far, available ‘embryonic’ material mainly involved Ornithopods and some Theropods of Upper Cretaceous age. We describe here the histology of several bones (vertebrae, limb bones) from the tiny but exceptionally well preserved in ovo remains of Upper Jurassic Theropod dinosaurs from the Paimogo locality near Lourinhã (Portugal). This Jurassic material allows to extend in time and to considerably supplement in great details our knowledge of early phases of growth in diameter and in length of endoskeletal bones of various shape, as well as shape modelling among carnivorous dinosaurs. Endochondral ossification in both short and long bones involves extensive pads of calcified cartilages permeated by marrow buds. We discuss the likely occurrence of genuine cartilage canals in dinosaurs and of an avian-like ‘medullary cartilaginous cone’ in Theropods. Patterns of periosteal ossification suggest high initial growth rates (20 μ m·day−1 or more), at once modulated by precise and locally specific changes in rates of new bone deposition. The resulting very precise shape modelling appears to start early and to involve at once some biomechanical components.

de Ricqlès, A., Mateus O., Antunes M. T., & Taquet P. (2001).  Histomorphogenesis of embryos of Upper Jurassic Theropods from Lourinhã (Portugal). Comptes Rendus de l{\textquotesingle}Académie des Sciences - Series {IIA} - Earth and Planetary Science. 332, 647–656., may, Number 10: Elsevier {BV} AbstractWebsite
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2006
Mateus, O., & The Gigantic dinosaur E. (2006).  The European Enigmatic Dinosaur Evolution (in Japanese). Abstract
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Schulp, A. S., Polcyn M. J., Mateus O., Jacobs L. L., Morais M. L., & Tavares T. S. (2006).  New mosasaur material from the Maastrichtian of Angola, with notes on the phylogeny, distribution and palaeoecology of the genus Prognathodon. Publicaties van het Natuurhistorisch Genootschap in Limburg Reeks XLV aflevering 1. Stichting Natuurpublicaties Limburg, Maastricht. 57-67. Abstract
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Jacobs, L. L., Mateus O., Polcyn M. J., Schulp A. S., Antunes M. T., Morais M. L., & Tavares T. S. (2006).  The occurrence and geological setting of Cretaceous dinosaurs, mosasaurs, plesiosaurs, and turtles from Angola. Journal of the Paleontological Society of Korea. 22, , Number 1 Abstract
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Schulp, A. S., Polcyn M. J., Mateus O., Jacobs L. L., Morais L. M., & Tavares T. S. (2006).  New mosasaur material from the Maastrichtian of Angola, with notes on the phylogeny, distribution and palaeoecology of the genus Prognathodon. Publicaties van het Natuurhistorisch Genootschap in Limburg Reeks XLV aflevering 1. Stichting Natuurpublicaties Limburg, Maastricht . 57-67 .schulp_polcyn_mateus_jacobs_et_al_2006_new_mosasaur_material_from_the_maastrichtian_of_angola_with_notes_on_the_phylogeny_distribution_and_palaeoecology_of_the_genus_prognathodon.pdf
2009
Tomas, C., Mateus O., & Abreu C. (2009).  Dinolourinhã – a integração dos jovens na paleontologia: o caso-estudo do Museu da Lourinhã.. Journal of Paleontological Techniques 5: 28-29.. Abstract
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Mateus, O., Jacobs L., Polcyn M., Schulp A. S., Vineyard D., Buta Neto A., & Telles Antunes M. (2009).  The oldest African eucryptodiran turtle from the Cretaceous of Angola. Acta Palaeontologica Polonica. 54, 581-588., Number 4 Abstract
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Eberth, D. A., Kobayashi Y., Lee Y. N., Mateus O., Therrien F., Zelenitsky D. K., & Norell M. A. (2009).  Assignment of Yamaceratops dorngobiensis and Associated Redbeds at Shine Us Khudag (Eastern Gobi, Dorngobi Province, Mongolia) to the Redescribed Javkhlant Formation (Upper Cretaceous). Journal of Vertebrate Paleontology. 29, 295-302., Jan: Univ Nova Lisboa, Hokkaido Univ, Museu Lourinha, Amer Museum Nat Hist, Korean Inst Geosci & Mineral Resources, Royal Tyrell Museum, Royal Tyrell Museum, Univ Calgary Abstracteberth_et_al-2009-__assignment_of_yamaceratops_dorngobiensis_and_associated_redbeds_at_shine_us_khudag_eastern_gobi_dorngobi_province_mongolia_to_the_redescribed_javkhlant_formation_upper_cretaceous_javkhlant_fm.pdf

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Tomas, C., Mateus O., & Abreu C. (2009).  Dinolourinhã; a integração dos jovens na paleontologia: o caso-estudo do Museu da Lourinhã. Journal of Paleontological Techniques 5: 28-29.. 28-29., Jan Abstracttomas_et_al_2009_dinolourinha_abstracts_jpt.pdf

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Eberth, D. A., Kobayashi Y., Lee Y. - N., Mateus O., Therrien F., Zelenitsky D. K., & Norell M. A. (2009).  Assignment of Yamaceratops dorngobiensis and associated redbeds at Shine Us Khudag (eastern Gobi, Dorngobi Province, Mongolia) to the redescribed Javkhlant Formation (Upper Cretaceous). Journal of Vertebrate Paleontology. 29, 295–302., mar, Number 1: Informa {UK} Limited AbstractWebsite
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2011
Mateus, O., Jacobs L. L., Schulp A. S., Polcyn M. J., Tavares T. S., Neto A. B., Morais M. L. {\'ı}sa, & Antunes M. T. (2011).  Angolatitan adamastor, a new sauropod dinosaur and the first record from Angola. Anais da Academia Brasileira de Ciências. 83, 221–233., Number 1: {FapUNIFESP} ({SciELO}) AbstractWebsite
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Mateus, O., Mateus O., Jacobs L. L., Schulp A. S., Polcyn M. J., Tavares T. S., Neto A. B., Morais M. L., & Antunes M. T. (2011).  Angolatitan adamastor, a new sauropod dinosaur and the first record from Angola. Anais da Academia Brasileira de Ciências. Abstract
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Mateus, O., Jacobs L. L., Schulp A. S., Polcyn M. J., Tavares T. S., Neto A. B., Morais M. L., & Antunes M. T. (2011).  Angolatitan adamastor, a new sauropod dinosaur and the first record from Angola.. Anais da Academia Brasileira de Ciências. 83, 221-233., Jan Abstractmateus_et_al_2011_angolatitan_adamastor_sauropod.pdfWebsite

A forelimb of a new sauropod dinosaur (Angolatitan adamastor n. gen. et sp.) from the Late Turonian of Iembe (Bengo Province) represents the first dinosaur discovery in Angola, and is one of the few occurrences of sauropod dinosaurs in sub-Saharan Africa collected with good chronological controls. The marginal marine sediments yielding the specimen are reported to be late Turonian in age and, thus it represents a non-titanosaurian sauropod in sub-Saharan Africa at a time taken to be dominated by titanosaurian forms. Moreover, Angolatitan adamastor is the only basal Somphospondyli known in the Late Cretaceous which implies in the existence of relict forms in Africa.

2012
Myers, T. S., Tabor N. J., Jacobs L. L., & Mateus O. (2012).  Palaeoclimate of the late jurassic of portugal: Comparison with the western united states. Sedimentology. 59, 1695-1717., Number 6 Abstract
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Myers, T. S., Tabor N. J., Jacobs L. L., & Mateus O. (2012).  Estimating soil pCO2 using paleosol carbonates: implications for the relationship between primary productivity and faunal richness in ancient terrestrial ecosystems. Paleobiology. 38(4), 585–604. Abstractmyers_et_al_2012_estimating_soil_paleosols_portugal.pdf

In this paper we present a method for estimating soil pCO2 in ancient environments using the measured carbon-isotope values of pedogenic carbonates and plant-derived organic matter. The validity of soil pCO2 estimates proves to be highly dependent on the organic δ13C values used in the calculations. Organic matter should be sourced from the same paleosol profiles as sampled carbonates to yield the most reliable estimates of soil pCO2. In order to demonstrate the potential use of soil pCO2 estimates in paleoecological and paleoenvironmental studies, we compare samples from three Upper Jurassic localities. Soil pCO2 estimates, interpreted as a qualitative indicator of primary paleoproductivity, are used to rank the Late Jurassic terrestrial environments represented by the Morrison Formation in western North America, the informally named Lourinhã formation in Western Europe, and the Stanleyville Group in Central Africa. Because modern terrestrial environments show a positive correlation between primary productivity and faunal richness, a similar relationship is expected in ancient ecosystems. When the relative paleoproductivity levels inferred for each study area are compared with estimates of dinosaur generic richness, a positive correlation emerges. Both the Morrison and Lourinhã formations have high inferred productivity levels and high estimated faunal richness. In contrast, the Stanleyville Group appears to have had low primary productivity and low faunal richness. Paleoclimatic data available for each study area indicate that both productivity and faunal richness are positively linked to water availability, as observed in modern terrestrial ecosystems.

Tschopp, E., & Mateus O. (2012).  Evidence for presence of clavicles and interclavicles in sauropod dinosaurs and its implications on the furcula-clavicle homology. Journal of Vertebrate Paleontology, Program and Abstracts, 2012, 184. ISSN 1937-2809 . 184. Abstracttschopp__mateus_2012_interclavicles_clavicles_svp_2012_abstract.pdf

Clavicles and interclavicles are plesiomorphically present in Reptilia. However, several groups show reduction or even loss of these elements. Crocodylimorpha, e.g., lost the clavicles, whereas dinosaurs are generally interpreted to only preserve the clavicles, the theropod furcula representing an unique case of fused clavicles. In sauropods, reports of clavicles are relatively frequent in non-titanosauriforms. These elements are elongated, curved, and rather stout bones with a spatulate and a bifurcate end. However, they were always found as single bones, and differ from the relatively short and unbifurcated clavicles found articulated with the scapulae of basal sauropodomorphs.
Elements from the Howe Quarry (Late Jurassic; Wyoming, USA) shed new light on these interpretations. Besides the elongated, curved bones (herein named morphotype A), also pairs of symmetric, L-shaped bones were recovered (morphotype B), associated with diplodocid dorsal and cervical vertebrae. Elements resembling morphotype B - articulated between the scapulae - have recently been reported from a diplodocid found near Tensleep, Wyoming. Taphonomic evidence, as well as the fact that they were preserved in symmetrical pairs, therefore implies that morphotype B represents the true sauropod clavicles.
Contrary to earlier reports, morphotype A elements from the Howe Quarry, as well as of previously reported specimens show a symmetry plane following the long axis of the elements. It is thus possible that the morphotype A elements were single bones from the body midline. The only such element present in the pectoral girdle of tetrapods are the interclavicle and the furcula. Comparison with crocodilian and lacertiform interclavicles indicates that the bifurcate end of the sauropod elements might represent the reduced transverse processes of the anterior end, and the spatulate end would have covered the coracoids or sternal plates ventrally.
The presence of both clavicles and interclavicles in the pectoral girdle stiffens the anterior trunk, and enhances considerably its stability. Such an enforcement might have been needed in diplodocids due to the strong lateral forces induced to the fore-limbs by the posteriorly placed center of mass (due to shorter fore- than hind-limbs), as well as lateral movements of the enormously elongated necks and tails. The absence of clavicles and interclavicles in titanosauriforms coincides with the development of wide-gauge locomotion style.
The presence of interclavicles in sauropods supports the recently proposed homology of the furcula with the interclavicle, instead of representing fused clavicles. Interclavicles were thus not lost, but may have remained cartilaginous or have yet to be found in basal dinosauriforms.

Mateus, O., Carrano M. T., & Taquet P. (2012).  Osteology of the embryonic theropods from the Late Jurassic of Paimogo, Portugal. Journal of Vertebrate Paleontology, Program and Abstracts, 2012, p.137. ISSN 1937-2809. 137.mateus_et_al_2012_embryos_paimogo_portugal_svp_2012_abstract_book_meeting_abstracts.pdf.pdf
Tschopp, E., & Mateus O. (2012).  A sternal plate of a large-sized sauropod dinosaur from the Late Jurassic of Portugal. 10th Annual Meeting of the European Association of Vertebrate Paleontologists ¡Fundamental! . 20, 263-266.: European Association of Vertebrate Paleontologist tschopp__mateus_2012_sternal_plate_sauropod_portugal.pdf
Myers, T. S., Tabor N. J., Jacobs L. L., & Mateus O. (2012).  Palaeoclimate of the Late Jurassic of Portugal: Comparison with the Western United States. Sedimentology. 59(6), 1695–1717., 2012//01/ Abstractmyers_et_al_2012_palaeoclimate_of_the_late_jurassic_of_portugal_comparison_with_the_western.pdfWebsite

Investigation of the palaeoclimatic conditions associated with Upper Jurassic strata in Portugal and comparison with published palaeoclimate reconstructions of the Upper Jurassic Morrison Formation in western North America provide important insights into the conditions that allowed two of the richest terrestrial faunas of this period to flourish. Geochemical analyses and observations of palaeosol morphology in the informally named Upper Jurassic Lourinhã formation of western Portugal indicate warm and wet palaeoclimatic conditions with strongly seasonal precipitation patterns. Palaeosol profiles are dominated by carbonate accumulations and abundant shrink-swell (vertic) features that are both indicative of seasonal variation in moisture availability. The δ18OSMOW and δDSMOW values of phyllosilicates sampled from palaeosol profiles range from +22·4‰ to +22·7‰ and −53·0‰ to −37·3‰, respectively. These isotope values correspond to temperatures of formation between 32°C and 39°C ± 3°, with an average of 36°C, which suggest surface temperatures between 27°C and 34°C (average 31°C). On average, these surface temperature estimates are 1°C higher than the highest summer temperatures modelled for Late Jurassic Iberia using general circulation models. Elemental analysis of matrix material from palaeosol B-horizons provides proxy (chemical index of alteration minus potassium) estimates of mean annual precipitation ranging from 766 to 1394 mm/year, with an average of approximately 1100 mm/year. Palaeoclimatic conditions during deposition of the Lourinhã formation are broadly similar to those inferred for the Morrison Formation, except somewhat wetter. Seasonal variation in moisture availability does not seem to have negatively impacted the ability of these environments to support rich and relatively abundant faunas. The similar climate between these two Late Jurassic terrestrial ecosystems is probably one of the factors which explains the similarity of their vertebrate faunas.

2013
Kullberg, J. C., Rocha R. B., Soares A. F., Rey J., Terrinha P., Azerêdo A. C., Callapez P., Duarte, L.V., Kullberg M. C., Martins L., Miranda J. R., Alves C., Mata J., Madeira J., Mateus O., Moreira M., & Nogueira C. R. (2013).  A Bacia Lusitaniana: Estratigrafia, Paleogeografia e Tectónica. (Dias, R. Araújo, A, Terrinha, P. and Kullberg, J. C., Ed.).Geologia de Portugal no contexto da Ibéria. Volume II. 195-350., Lisboa: Escolar Editorakullberg_et_al_2013_a_bacia_lusitaniana.pdf
Mateus, O., & Tschopp E. (2013).  Cathetosaurus as a valid sauropod genus and comparisons with Camarasaurus. Journal of Vertebrate Paleontology, Program and Abstracts, 2013. 173.mateus__tschopp_2013_cathetosaurs_camarasaurus__svp_meeting_abstracts_213.pdf
Tschopp, E., & Mateus O. (2013).  Clavicles, interclavicles, gastralia, and sternal ribs in sauropod dinosaurs: new reports from Diplodocidae and their morphological, functional and evolutionary implications. Journal of Anatomy. 222, 321-340. Abstracttschopp__mateus_2013_clavicles_interclavicles_gastralia_and_sternal_ribs_in_diplodocid.pdfWebsite

Ossified gastralia, clavicles and sternal ribs are known in a variety of reptilians, including dinosaurs. In sauropods, however, the identity of these bones is controversial. The peculiar shapes of these bones complicate their identification, which led to various differing interpretations in the past. Here we describe different elements from the chest region of diplodocids, found near Shell, Wyoming, USA. Five morphotypes are easily distinguishable: (A) elongated, relatively stout, curved elements with a spatulate and a bifurcate end resemble much the previously reported sauropod clavicles, but might actually represent interclavicles; (B) short, L-shaped elements, mostly preserved as a symmetrical pair, probably are the real clavicles, as indicated by new findings in diplodocids; (C) slender, rod-like bones with rugose ends are highly similar to elements identified as sauropod sternal ribs; (D) curved bones with wide, probably medial ends constitute the fourth morphotype, herein interpreted as gastralia; and (E) irregularly shaped elements, often with extended rugosities, are included into the fifth morphotype, tentatively identified as sternal ribs and/or intercostal elements. To our knowledge, the bones previously interpreted as sauropod clavicles were always found as single bones, which sheds doubt on the validity of their identification. Various lines of evidence presented herein suggest they might actually be interclavicles – which are single elements. This would be the first definitive evidence of interclavicles in dinosauromorphs. Previously supposed interclavicles in the early sauropodomorph Massospondylus or the theropods Oviraptor and Velociraptor were later reinterpreted as clavicles or furculae. Independent from their identification, the existence of the reported bones has both phylogenetic and functional significance. Their presence in non-neosauropod Eusauropoda and Flagellicaudata and probable absence in rebbachisaurs and Titanosauriformes shows a clear character polarity. This implicates that the ossification of these bones can be considered plesiomorphic for Sauropoda. The proposed presence of interclavicles in sauropods may give further support to a recent study, which finds a homology of the avian furcula with the interclavicle to be equally parsimonious to the traditional theory that furcula were formed by the fusion of the clavicles. Functional implications are the stabilizing of the chest region, which coincides with the development of elongated cervical and caudal vertebral columns or the use of the tail as defensive weapon. The loss of ossified chest bones coincides with more widely spaced limbs, and the evolution of a wide-gauge locomotor style.

Tschopp, E., & Mateus O. (2013).  The skull and neck of a new flagellicaudatan sauropod from the Morrison Formation and its implication for the evolution and ontogeny of diplodocid dinosaurs. Journal of Systematic Palaeontology. 11(7), 853–888. Abstracttschopp__mateus_2013_the_skull_and_neck_of_a_new_flagellicaudatan_sauropod_from_the_morrison.pdfWebsite

A new taxon of diplodocid sauropod, Kaatedocus siberi gen. et sp. nov., is recognized based on well-preserved cervical vertebrae and skull from the Morrison Formation (Kimmeridgian, Late Jurassic) of northern Wyoming, USA. A phylogenetic analysis places it inside Diplodocinae (Sauropoda: Flagellicaudata: Diplodocidae), as a sister taxon to a clade uniting Tornieria africana and the classical diplodocines Barosaurus lentus and Diplodocus. The taxon is diagnosed by a unique combination of plesiomorphic and derived traits, as well as the following unambiguous autapomorphies within Diplodocidae: frontals separated anteriorly by a U-shaped notch; squamosals restricted to the post-orbital region; presence of a postparietal foramen; a narrow, sharp and distinct sagittal nuchal crest; the paired basal tuber with a straight anterior edge in ventral view; anterior end of the prezygapophyses of mid- and posterior cervical vertebrae is often an anterior extension of the pre-epipophysis, which projects considerably anterior to the articular facet; anterodorsal corner of the lateral side of the posterior cervical vertebrae marked by a rugose tuberosity; posterior margin of the prezygapophyseal articular facet of posterior cervical vertebrae bordered posteriorly by conspicuous transverse sulcus; posterior cervical neural spines parallel to converging. The inclusion of K. siberi and several newly described characters into a previously published phylogenetic analysis recovers the new taxon as basal diplodocine, which concurs well with the low stratigraphical position of the holotype specimen. Dinheirosaurus and Supersaurus now represent the sister clade to Apatosaurus and Diplodocinae and therefore the most basal diplodocid genera. The geographical location in the less known northern parts of the Morrison Fm., where K. siberi was found, corroborates previous hypotheses on faunal provinces within the formation. The probable subadult ontogenetic stage of the holotype specimen allows analysis of ontogenetic changes and their influence on diplodocid phylogeny.

da} Rocha, {R. E. B., Kullberg {J. C. R. }, & Mateus O. (2013).  A Bacia Lusitaniana: Estratigrafia, Paleogeografia e Tectónica. (Dias, Araújo, R., A, Terrinha, P., Kullberg, {J. C.}, Ed.).Geologia de Portugal no contexto da Ibéria. 195–347., 1: Escolar Editora Abstract
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2014
Strganac, C., Salminen J., Jacobs L. L., Polcyn M. J., Ferguson K. M., Mateus O., Schulp A. S., Morais M. L., Tavares T. S., & Gon?alves A. O. (2014).  Carbon isotope stratigraphy, magnetostratigraphy, and 40Ar/39Ar age of the cretaceous South Atlantic coast, Namibe Basin, Angola. Journal of African Earth Sciences. 99, 452-462., Number PA2 Abstract
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