Publications in the Year: 2014

Journal Article

Russo, J, Mateus O, Balbino A, Marzola M.  2014.  Crocodylomorph eggs and eggshells from the Lourinhã Fm. (Upper Jurassic), Portugal. Comunica\\c cões Geológicas. 101, Especial I:563-566. Abstract

We here present fossil Crocodylomorpha eggshells from the Upper Jurassic Lourinhã Formation of Portugal, recovered from five sites: one nest from Cambelas with 13 eggs, and three partial eggs and various fragments from, Paimogo N (I), Paimogo S (II), Casal da Rola, and Peralta. All specimens but the nest were found in association with dinosaur egg material. Our research reveals that on a micro- and ultrastructural analysis, all samples present the typical characters consistent with crocodiloid eggshell morphotype, such as the shell unit shape, the organization of the eggshell layers, and the triangular blocky extinction observed with crossed nicols. We assign the material from the Lourinhã Formation to the oofamily Krokolithidae, making it the oldest crocodylomorph eggs known so far, as well as the best record for eggs of non- crocodylian crocodylomorphs. Furthermore, our study indicates that the basic structure of crocodiloid eggshells has remained stable since at least the Upper Jurassic.

Hayashi, S, Redelstorff R, Mateus O, Watabe M, Carpenter K.  2014.  Gigantism of stegosaurian osteoderms. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:145.hayashi_et_al_2014_gigantism_of_stegosaurian_osteoderms.pdf
Mateus, O.  2014.  Gigantism of stegosaurian osteoderms. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:145.: Taylor & Francis Abstract
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Mateus, O, Butler RJ, Brusatte SL, Whiteside JH, Steyer JS.  2014.  The first phytosaur (Diapsida, Archosauriformes) from the Late Triassic of the Iberian Peninsula. Journal of Vertebrate Paleontology. 34:970–975., Number 4 Abstract
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Hendrickx, C, Mateus O.  2014.  Abelisauridae (Dinosauria: Theropoda) from the Late Jurassic of Portugal and dentition-based phylogeny as a contribution for the identification of isolated theropod teeth. Zootaxa. 3759:1-74. Abstracthendrickx__mateus_2014._abelisauridae_dinosauria_theropoda_from_the_late_jurassic_of_portugal.pdf

Theropod dinosaurs form a highly diversified clade, and their teeth are some of the most common components of the Mesozoic dinosaur fossil record. This is the case in the Lourinhã Formation (Late Jurassic, Kimmeridgian-Tithonian) of Portugal, where theropod teeth are particularly abundant and diverse. Four isolated theropod teeth are here described and identified based on morphometric and anatomical data. They are included in a cladistic analysis performed on a data matrix of 141 dentition-based characters coded in 60 taxa, as well as a supermatrix combining our dataset with six recent datamatrices based on the whole theropod skeleton. The consensus tree resulting from the dentition-based data matrix reveals that theropod teeth provide reliable data for identification at approximately family level. Therefore, phylogenetic methods will help identifying theropod teeth with more confidence in the future. Although dental characters do not reliably indicate relationships among higher clades of theropods, they demonstrate interesting patterns of homoplasy suggesting dietary convergence in (1) alvarezsauroids, therizinosaurs and troodontids; (2) coelophysoids and spinosaurids; (3) compsognathids and dromaeosaurids; and (4) ceratosaurids, allosauroids and megalosaurids.

Based on morphometric and cladistic analyses, the biggest tooth from Lourinhã is referred to a mesial crown of the megalosaurid Torvosaurus tanneri, due to the elliptical cross section of the crown base, the large size and elongation of the crown, medially positioned mesial and distal carinae, and the coarse denticles. The smallest tooth is identified as Richardoestesia, and as a close relative of R. gilmorei based on the weak constriction between crown and root, the “eight-shaped” outline of the base crown and, on the distal carina, the average of ten symmetrically rounded denticles per mm, as well as a subequal number of denticles basally and at mid-crown. Finally, the two medium-sized teeth belong to the same taxon and exhibit pronounced interdenticular sulci between distal denticles, hooked distal denticles for one of them, an irregular enamel texture, and a straight distal margin, a combination of features only observed in abelisaurids. They provide the first record of Abelisauridae in the Jurassic of Laurasia and one of the oldest records of this clade in the world, suggesting a possible radiation of Abelisauridae in Europe well before the Upper Cretaceous.

Tschopp, E, Mateus O, Kosma R, Sander M, Joger U, Wings O.  2014.  A specimen-level cladistic analysis of Camarasaurus (Dinosauria, Sauropoda) and a revision of camarasaurid taxonomy. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:241-242.tschopp_et_al._2014_a_specimen-level_cladistic_analysis_of_camarasaurus.pdf
Mateus, O, Mannion PD, Upchurch P.  2014.  Zby atlanticus, a new turiasaurian sauropod (Dinosauria, Eusauropoda) from the Late Jurassic of Portugal. Journal of Vertebrate Paleontology. 34:618-634., Number 3 Abstract
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Mateus, O, Butler RJ, Brusatte SL, Whiteside JH, Steyer SJ.  2014.  The first phytosaur (Diapsida, Archosauriformes) from the Late Triassic of the Iberian Peninsula. Journal of Vertebrate Paleontology. 34(4):970-975.mateus_et_al_2014_first_phytosaur_algarve_portugal_jvp.pdfWebsite
Russo, J, Mateus O, Balbino A, Marzola M.  2014.  Crocodylomorph eggs and eggshells from the Lourinhã Fm. (Upper Jurassic), Portugal. Comunica\\c cões Geológicas. 101, Especial I:563-566. Abstract
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Strganac, C, Jacobs LL, Polcyn MJ, Ferguson KM, Mateus O, Gon?alves AO, Morais M-L, da Silva Tavares T.  2014.  Stable oxygen isotope chemostratigraphy and paleotemperature regime of mosasaurs at Bentiaba, Angola. Geologie en Mijnbouw/Netherlands Journal of Geosciences. 94:137-143., Number 1 Abstract
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Mateus, O, Clemmensen L, Klein N, Wings O, Frobøse N, Milàn J, Adolfssen J, Estrup E.  2014.  The Late Triassic of Jameson Land revisited: new vertebrate findings and the first phytosaur from Greenland. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:182.mateus_et_al2014-_jameson_land_revisited_-_svp_2014.pdf
Mateus, O, Butler RJ, Brusatte SL, Whiteside JH, Steyer JS.  2014.  The first phytosaur (Diapsida, Archosauriformes) from the Late Triassic of the Iberian Peninsula. Journal of Vertebrate Paleontology. 34:970-975., Number 4 Abstract
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Strganac, C, Salminen J, Jacobs LL, Ferguson KM, Polcyn MJ, Mateus O, Schulp AS, Morais ML, Tavares TS, Gonçalves AO.  2014.  Carbon isotope stratigraphy and 40Ar/39Ar age of the Cretaceous South Atlantic coast, Namibe Basin, Angola. Journal of African Earth Sciences. onine:1-11. Abstractstrganac_et_al_2014_carbon_isotope_stratigraphy_magnetostratigraphy_and_40ar_39ar_age_of.pdfWebsite

We present the δ13C and paleomagnetic stratigraphy for marine strata at the coast of southern Angola, anchored by an intercalated basalt with a whole rock 40Ar/39Ar radiometric age of 84.6 ± 1.5 Ma, being consistent with both invertebrate and vertebrate biostratigraphy. This is the first African stable carbon isotope record correlated to significant events in the global carbon cycle spanning the Late Cenomanian to Early Maastrichtian. A positive ∼ 3‰ excursion seen in bivalve shells below the basalt indicates the Cenomanian-Turonian Boundary Event at 93.9 Ma, during Oceanic Anoxic Event 2. Additional excursions above the basalt are correlated to patterns globally, including a negative ∼ 3‰ excursion near the top of the section interpreted as part of the Campanian-Maastrichtian Boundary Events. The age of the basalt ties the studied Bentiaba section to a pulse of Late Cretaceous magmatic activity around the South Atlantic and significant tectonic activity, including rotation, of the African continent.

Polcyn, M, Jacobs L, Strganac C, Mateus O, Myers S, May S, Araujo R, Schulp A, Morais M.  2014.  Geology and paleoecology of a marine vertebrate bonebed from the lower Maastrichtian of Angola. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:206.polcyn_et_al._2014_geology_and_paleoecology_of_a_marine_vertebrate_bonebed_from_the_lower_maastrichtian_of_angola.pdf
Marinheiro, J, Mateus O, Alaoui A, Amani F, Nami M, Ribeiro C.  2014.  New quaternary fossil sites from the middle atlas of morocco,Novas jazidas fossilíferas do Quaternário do Médio-Atlas de Marrocos. Comunicacoes Geologicas. 101:485-488. Abstract
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Mateus, O, Dinis J, Cunha P.  2014.  Upper Jurassic to Lowermost Cretaceous of the Lusitanian Basin, Portugal-landscapes where dinosaurs walked. Ciências da Terra, special. , Number 8 Abstract
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Araújo, R, Polcyn MJ, Schulp AS, Mateus O, Jacobs LL, Gon?alves AO, Morais M-L.  2014.  A new elasmosaurid from the early Maastrichtian of Angola and the implications of girdle morphology on swimming style in plesiosaurs. Geologie en Mijnbouw/Netherlands Journal of Geosciences. 94:109-120., Number 1 Abstract
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Russo, J, Mateus O, Balbino A, Marzola M.  2014.  Crocodylomorph eggs and eggshells from the Lourinhã Fm. (Upper Jurassic), Portugal. Comunica\\c cões Geológicas. 101, Especial I:563-566. Abstract
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Jacobs, L, Polcyn M, Mateus O, Scott M, Graf J, Kappelman J, Jacobs B, Schulp A, Morais M, Goncalves O.  2014.  Cenozoic vertebrates of coastal Angola. Journal of Vertebrate Paleontology, Program and Abstracts, 2014. :153.jacobs_et_al._2014_cenozoic_vertebrates_of_coastal_angola.pdf
Strganac, C, Jacobs LL, Polcyn MJ, Mateus O, Myers TS, Salminen J, May SR, Araújo R, Ferguson KM, Gon?alves AO, Morais ML, Schulp AS, da Silva Tavares T.  2014.  Geological setting and paleoecology of the Upper Cretaceous Bench 19 Marine Vertebrate Bonebed at Bentiaba, Angola. Geologie en Mijnbouw/Netherlands Journal of Geosciences. 94:121-136., Number 1 Abstract
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Ribeiro, V, Mateus O, Holwerda F, Araújo R, Castanhinha R.  2014.  Two new theropod egg sites from the Late Jurassic Lourinhã Formation, Portugal. Historical Biology. 26(2):206-217. Abstractribeiro_et_al_2014_theropod_eggs_nest_portugal.pdfWebsite

Two new Late Jurassic (uppermost Late Kimmeridgian) dinosaur eggshell sites are described, Casal da Rola and Porto das Barcas, both near Lourinha˜, central-west Portugal. Casal da Rola yields eggshells with an obliquiprismatic morphotype comparable to those from a nest with the associated fossil embryos from Paimogo, tentatively assigned to the theropod Lourinhanosaurus antunesi. The Porto das Barcas eggshells have a dendrospherulitic morphotype with a prolatocanaliculate pore system. This morphotype was also recognised in eggshells from a clutch with associated Torvosaurus embryos at the Porto das Barcas locality. A preliminary cladistic analysis of eggshell morphology suggests theropod affinities for the Casal da Rola eggs, but is unable to resolve the phylogenetic position of the Porto das Barcas eggs. The eggshells at both sites are preserved in distal flood plain mudstones and siltstones. Carbonate concretions within the deposits indicate paleosol development.

Marinheiro, J, Mateus O, Alaoui A, Amani F, Nami M, Ribeiro C.  2014.  Elephas and other vertebrate fossils near Taghrout, Morocco. Journal of Vertebrate Paleontology. Program and Abstracts, 2014:178.marinheiro_et_al._2014_elephas_and_other_vertebrate_fossils_near_taghrout.pdf
Araújo, R, Polcyn MJ, Lindgren J, Jacobs LL, Schulp AS, Mateus O, Gon?alves AO, Morais M-L.  2014.  New aristonectine elasmosaurid plesiosaur specimens from the Early Maastrichtian of Angola and comments on paedomorphism in plesiosaurs. Geologie en Mijnbouw/Netherlands Journal of Geosciences. 94:93-108., Number 1 Abstract
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Ribeiro, V, Mateus O, Holwerda F, Araújo R, Castanhinha R.  2014.  Two new theropod egg sites from the Late Jurassic Lourinhã Formation, Portugal. Historical Biology. 26:206-217., Number 2 Abstract
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