Diogenes de Almeida Campos

Geological Survey of Brazil | CPRM · Museum of Earth Sciences

The Chaoyangopteridae is a clade of azhdarchoid pterosaurs that stands out in China, particularly in the Jehol Biota, as a Cretaceous group of medium-sized and high-crested pterosaurs. Herein, we describe a new species, Meilifeilong youhao gen. et sp. nov., based on two specimens, one tentatively referred to this taxon. This new species represents...

Titanosaurs reached extremes in size and diversity, but many paleobiological aspects of these sauropod dinosaurs are still unknown. Here we infer life history traits based on the microstructure of axial bones of three lithostrotian titanosaur species: Austroposeidon magnificus, Gondwanatitan faustoi and Maxakalisaurus topai — Campanian–Maastrichtia...

The record of unenlagiines in Brazil, except for one dorsal vertebra, is still under debate based on isolated teeth. Here, we describe Ypupiara lopai gen. et sp. nov., the first dromaeosaurid species from Brazil, from the Maastrichtian of the Bauru Group, Paraná Basin. The specimen consists of a partial right maxilla (with three teeth in loci) and...

A recent publication of fossil bones of titanosaurs assigned to Aeolosaurini from the Morro do Cambambe site (Mato Grosso state, Brazil, Upper Cretaceous) reported anomalous growth in some of them. Here, we present osteohistological sections of elements to understand not only the microstructure and growth of such bones, but also the nature of those...

Dyrosauridae was a successful clade of marine crocodyliforms that survived the Cretaceous-Paleogene biotic crises. The most important taxon from North America is Hyposaurus rogersii, a species first described in the mid-19th century based on fragmentary fossils. Several new specimens are described here, comprising material that once belonged to the...

In 1940, L.I. Price and A. Oliveira recovered four crocodyliform specimens from the Early Cretaceous Bahia Supergroup (Recôncavo-Tucano Basin). In the present work, we describe four different fossil specimens: an osteoderm, a fibula, a tibia, and some autopodial bones. No further identification besides Mesoeucrocodylia was made due to their fragmen...

The study of pneumatization along axial series of theropods is mostly based on isolated and fragmented specimens. Among abelisauroids, so far the pneumatization of vertebrae was only recognized by external aspects and the morphology of internal pneumatic structures is restricted to the observation of broken regions. Here we describe and provide μCT...

Titanosaurian dinosaurs include some of the largest land-living animals that ever existed, and most were discovered in Cretaceous deposits of Argentina. Here we describe the first Brazilian gigantic titanosaur, Austroposeidon magnificus gen. et sp. nov., from the Late Cretaceous Presidente Prudente Formation (Bauru Group, Paraná Basin), São Paulo S...

List A, Character List. Table A, Character matrix. (DOC)

Reconstruction pdf A, The 3D reconstruction of Cv13. Reconstruction pdf B, The 3D reconstruction of D1. (RAR)

The Solimoes Formation (lower Eocene-Pliocene), southwestern Brazilian Amazonia, is one of the most abundant deposits of reptiles from the Cenozoic of Brazil. Eight species of Crocodylia have been described from this formation, including taxa of all the three main extant clades: Gavialoidea (Gryposuchus and Hesperogavialis), Alligatoroidea (Caiman,...

Background. Pelomedusoides turtles are an important group in extant fauna of northern South America, Africa and Madagascar, which have a long fossil record, with numerous records through the Cretaceous, Paleogene, and Neogene in South America. One of high- diversified clade of this linage is Bothremydidae, and its record extends from Early Cretaceo...

Background. Pelomedusoides turtles are an important group in extant fauna of northern South America, Africa and Madagascar, which have a long fossil record, with numerous records through the Cretaceous, Paleogene, and Neogene in South America. One of high- diversified clade of this linage is Bothremydidae, and its record extends from Early Cretaceo...

During the RadamBrasil project in eastern Acre State, fossils were collected in the Solimões Formation (upper Miocene). Here we describe two Aves materials, a right humerus (DGM 1168-R) and a right tarsometatarsus (DGM 1297-R) from Bandeira locality. The humerus shares the following features with Anhinga: crista bicipitalis planar; deltopectoral cr...

A new crocodyliform, Sahitisuchus fluminensis gen. et sp. nov., is described based on a complete skull, lower jaw and anterior cervical vertebrae collected in the São José de Itaboraí Basin of Rio de Janeiro, Brazil. The specimen is one of the best preserved crocodyliforms from Paleocene deposits recovered so far and represents a sebecosuchian, one...

Brazilian turtle remains date from the Cretaceous and have been recovered from in 11 different basins. Two of these are of particular importance because of the richness of species and specimens: Araripe (Early Cretaceous) and Bauru (Late Cretaceous). Here we present information based on new material that adds to our understanding of the diversity o...

A new titanosaur dinosaur, Brasilotitan nemophagus gen. et sp. nov., is described from the Adamantina Formation (Turonian-Santonian, Bauru Basin). The specimen consists of a dentary, cervical and sacral vertebrae, one ungual and remains of the pelvic region, that were collected near Presidente Prudente city, Sdo Paulo State. It shows a mandible wit...

Although important dinosaur specimens have been recently described from Brazil, the theropod record in this county is still rather scarce, particularly from Cretaceous strata. Here we describe a complete right tibia (MCT 1783-R) from the Marilia Formation (Maastrichtian, Bauru Basin) near Peiropolis (Uberaba, Minas Gerais). This is the best theropo...

A new small species of Eocaiman is described on the basis of three anterior left mandibular rami and one isolated tooth. The specimens came from the middle-upper Paleocene Itaboraí Basin (Rio de Janeiro State, Brazil; Itaboraian South American Land Mammal Age). The new taxon differs from the other two Eocaiman species, such as its small size, likel...

Although important dinosaur specimens have been recently described from Brazil, the theropod record in this county is still rather scarce, particularly from Cretaceous strata. Here we describe a complete right tibia (MCT 1783-R) from the Marília Formation (Maastrichtian, Bauru Basin) near Peirópolis (Uberaba, Minas Gerais). This is the best ther...

A very large pterosaur (MN 6594-V) from the Romualdo Formation (Aptian/Albian), Santana Group, Araripe Basin, is described. The specimen is referred to Tropeognathus cf. T. mesembrinus mainly due to the presence of a low and blunt frontoparietal crest, the comparatively low number of teeth and the inclined dorsal part of the occipital region. Two d...

A new species of Notosuchia, Labidiosuchus amicum gen. et sp. nov., is described based on an incomplete lower jaw (DGM 1480-R) from the Upper Cretaceous Marília Formation (Maastrichtian) recovered from a quarry near the Peirópolis municipality, Minas Gerais State, Southeastern Brazil. The mandibular symphysis is long, strong anterodorsally projecte...

A new species of a bizarre notosuchian mesoeucrocodylian is reported here. Caryonosuchus pricei gen. et sp. nov. was found in the outcrops of the Adamantina Formation (Campanian–Masstrichtian) in São Paulo State, Brazil, and shows a typical sphagesaurid dentition: strong and short teeth, obliquely implanted with the crown of the upper teeth showing...

The family Podocnemididae consists of 20 genera and 30 species considered here as valid and diagnosable by cranial characters. Three of these genera and eight species persist into the Recent fauna, barely reflecting the evolutionary diversity and distribution of the group. The family extends from the Late Cretaceous to the Recent and occurs in Nort...

A new crocodyliform from the Upper Cretaceous (Campanian-Maastrichtian) Presidente Prudente Formation of the Bauru Group is described based on two almost complete skulls and mandibles. The material comes from the "Tartaruguito" site, situated at an old railroad between the cities of Pirapozinho and Presidente Prudente, state of São Paulo, Brazil. T...

Columnar section and plan view of occurrence of fossil bones of Tapuiasaurus macedoi gen. n. sp. n. (TIF)

Location of the Sanfranciscana basin. Location and geological sketch-map of the basin showing the local of occurrence of Tapuiasaurus macedoi gen. n. sp. n. (TIF)

Geological Setting. (DOC)

Stratigraphy of the Sanfranciscana basin. (TIF)

Bremer and bootstrap support values for the nodes on a reduced consensus tree. The tree shows support values that result from applying reduced consensus during the Bremer and Bootstrap analyses, ignoring the alternative positions of the most unstable advanced titanosaurians included in the analysis (i.e., Nemegtosaurus, Diamantinasaurus, and Isisau...

Character list and data matrix used in phylogenetic analysis. Character definitions 1 to 234 are from [15] and have the same numeration as in the original publication. The additional characters are either new or taken from [2] and their respective sources are cited along with the character number of the original publication. Characters 8, 37, 64, 6...

List of unambiguous synapomorphies. (DOC)

Strict consensus of the two most parsimonious trees found in the phylogenetic analysis. (TIF)

Bremer and bootstrap support values for the nodes of the consensus tree. (TIF)

Age of first appearance for taxa used in the calibrated phylogeny. (DOC)

Advanced titanosaurian sauropods, such as nemegtosaurids and saltasaurids, were diverse and one of the most important groups of herbivores in the terrestrial biotas of the Late Cretaceous. However, little is known about their rise and diversification prior to the Late Cretaceous. Furthermore, the evolution of their highly-modified skull anatomy has...

The early Cretaceous Santana Formation exposed on the Chapada do Araripe in Ceará State, northeastern Brazil, has yielded remains of a side-necked turtle, Cearachelys placidoi, new genus and species. Cearachelys is based on two skeletons, each consisting of articulated shell, associated skull, and postcrania in varying degrees of completeness. Cear...

The soft tissue preserved in the holotype (IVPP V12705) of Jeholopterus ningchengensis from the Daohugou Bed (Late Jurassic or Early Cretaceous) of China is described in detail. The plagiopatagium can be divided into the distal, comparatively more rigid actinopagatium and a proximal, more tensile tenopatagium. The actinopatagium extends from the wi...

A new genus and species of podocnemidid pleurodire, Caninemys tridentata, is described on the basis of a skull collected by L.I. Price in 1962 from the late Miocene of Acre, Brazil. It is unique among podocnemidids (and all other turtles) in having greatly inflated maxillae, each with a ventral, toothlike process. Along with a midline process of th...

The record of theropod dinosaurs in Brazil is very scarce. One of the most promising lithostratigraphic units for those reptiles is the Bauru Group. The dinosaur remains found in this unit are mainly those of sauropods, while theropods are represented mostly by teeth. Here we describe a right scapula (housed at the Earth Science Museum of the Depar...

A previously undescribed toothless flying reptile from northeastern China, Nemicolopterus crypticus gen. et sp. nov., was discovered in the lacustrine sediments of the Early Cretaceous Jiufotang Formation, western Liaoning, China. The specimen consists of an almost complete articulated skeleton (IVPP V14377) and, despite representing an immature in...

A new pterosaur, Hongshanopterus lacustris gen. et sp. nov., from the Early Cretaceous Jiufotang Formation, western Liaoning, China is described. The specimen (IVPP V14582) consists of a skull preserved in palatal view and some iso-lated cervical vertebrae. Based on the labiolingually compressed teeth with a triangular crown Hongshanopterus lacus-t...

A partial skeleton (including skull, mandible and soft tissue) of a new archaeopterodactyloid pterosaur, Gegepterus changi gen. et sp. nov. from the Lower Cretaceous of Liaoning, northeast China is described. The specimen, IVPP V 11981, was collected from grey shales of the lower Yixian Formation (125 Ma) at the Sihetun locality, near the city of B...

The cranial morphology of Mariliasuchus amarali, a poorly known notosuchian from the Late Cretaceous of Southeastern Brazil, is redescribed based on new material. Its phylogenetic affinities within Crocodylomorpha are evaluated through a parsimony analysis involving 46 taxa and 198 characters. Mariliasuchus is nested well inside the clade Notosuchi...

New specimens and an analysis of the Jehol pterosaur faunae of northeastern China show an unexpected diversity of flying reptile groups in terrestrial Cretaceous ecosystems. Here we report two new pterosaurs that are referred to European groups previously unknown in deposits of northeastern China. Feilongus youngi, from the Yixian Formation, is clo...

The Romualdo Member of the Santana Formation (Araripe Basin, northeastern Brazil) is famous for the abundance and the exceptional preservation of the fossils found in its early diagenetic carbonate concretions. However, a vast majority of these Early Cretaceous fossils lack precise geographical and stratigraphic data. The absence of such contextual...

A new titanosaurid dinosaur from the Late Cretaceous continental deposits of the Bauru Group is described. Trigonosaurus pricei n.gen., n.sp., is based on two specimens, both collected at the Caieira Quarry near Peirópolis, Minas Gerais. The holotype consists of the five most posterior cervical vertebrae, 10 dorsals, six sacrals and the left ilium...

The discovery of a previously undescribed pterosaur, Thalassodromeus sethi, yields information on the function of cranial crests and the feeding strategy developed by these extinct flying reptiles. The material consists of a large skull (length: 1420 millimeters, including the crest) with a huge bony crest that was well irrigated by blood vessels a...

Dinosaur research is developing at very high rates around the world resulting in several new discoveries that are improving our understanding of this terrestrial reptilian clade. Except for the last couple years, the studies of Brazilian dinosaurs have not followed this expansive trend, despite the high potential of several dinosaur localities. So...

A preliminary description of a new crocodyliform from the Bauru Formation (Adamantina Facies) is presented. The specimen (DGM-1477) consist of an almost complete skeleton with skull, partial mandible, vertebral column (lacking most of the tail), and limb elements which is here regarded as a new taxon, Stratiotosuchus maxhechti gen.nov. sp.nov. Base...

11 Anuário do Instituto de Geociências - UFRJ Volume 24 / 2001 Um Professor de Paleontologia: Ignacio Brito (1938-2001) Diogenes de Almeida Campos Museu de Ciências da Terra - DNPM Ignacio Aureliano Machado Brito, nascido no Rio de Janeiro, em 29 de junho de 1938, filho de Gratuliano da Costa Brito e de Adelaide Machado Brito, realizou seus estudos...

Dinosaur research is developing at very high rates around the world resulting in several new discoveries that are improving our understanding of this terrestrial reptilian clade. Except for the last couple years, the studies of Brazilian dinosaurs have not followed this expansive trend, despite the high potential of several dinosaur localities. So...

A review of the vertebrate fossil diversity in Brazil is presented. The best known faunas are the fish and reptiles from the Santana Formation (both, Crato and Romualdo Members). Also comparatively well known are the mammalian faunas from Pleistocene deposits, which is the result of extensive research done in the last decades. Poorly known are the...

The specimen consists of a complete skull, the first one reported from the Crato Member, of a new species, Tapejara imperator n.sp. It displays a remarkable sagittal crest that doubles the length and increases in about six times the height of the skull. The upper and main portion of the crest is formed by soft tissue that is supported anteriorly an...

The discovery of the first theropod dinosaur from the Early Cretaceous of Brazil is reported here. The material consists of the anterior portion of a skull and represents a new taxon, Angaturama limai n.g. n.sp. This dinosaur has an extremely laterally compressed rostrum with a well developed premaxillary sagittal crest. Several synapomorphies sugg...

The geological history of the Brazilian continental marginal basins is related to the separation of the Brazilian and African plates during the Cretaceous. Four phases could be recognized in this process: Continental or pre-rift; Rift or lacustrine; restricted sea or evaporite-type; Marine after the late Aptian. The present paper aims to study the...

An Early Cretaceous (Aptian) fossil feather has been discovered in the Araipe Basin, northeast Brazil. Its features, including an overall fluffy aspect, indicate that it is a definitive down feather. This new material provides empirical evidence that birds had already developed an effective thermoregulatory insulation cover, with down feathers, by...

The Albian-Cenomanian deposits of Pamaíba Basin (Itapccuru Formation), North of Brazil, contain plant fragments, bivalvia. gastropoda, fishes (Dipnoi, Elasmobranchia. Actinopterygii), reptiles (Theropoda, Sauropoda, Crocodilia. Testudines), besides bone fragments and teeth presumably belonging to mammals of thc order Triconodonta. The molar tooth s...