Juan Carlos Cisneros

Juan Carlos Cisneros
Universidade Federal do Piauí | UFPI · Centro de Ciências da Natureza

PhD. University of the Witwatersrand

About

89
Publications
28,135
Reads
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1,188
Citations
Citations since 2017
45 Research Items
656 Citations
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2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
2017201820192020202120222023020406080100120140
Introduction
My main interest is on Permian and Triassic tetrapods from Gondwana. I currently focus on exploring the Parnaíba Basin of NE Brazil. Also interested in science colonialism and illicit fossil traffic issues.
Additional affiliations
January 2014 - January 2019
Federal University of Pernambuco
Position
  • Professor (Associate)
May 2010 - present
Universidade Federal do Piauí
Position
  • Professor (Full)
March 2007 - April 2010
Universidade Federal do Rio Grande do Sul
Position
  • PostDoc Position
Education
September 2003 - April 2007
University of the Witwatersrand
Field of study
  • Palaeontology

Publications

Publications (89)
Article
A new procolophonid reptile from the Lower Triassic Arcadia Formation of Queensland, Australia is described on the basis of abundant cranial and postcranial remains. Eomurruna yurrgensis gen. & sp. nov. is the first parareptile from Australia, being represented by more than 40 specimens from which a detailed description of the osteology is made. Th...
Article
A new parareptile from the Cisuralian Pedra de Fogo Formation of north-eastern Brazil is described. Karutia fortunata gen. et sp. nov. is the first Gondwanan member of Acleistorhinidae, a clade previously known only from North America but thought to be closely related to the Russian Lanthanosuchidae. A re-examination of parareptile phylogeny indica...
Article
To the Editor — The dinosaur fossil ‘Ubirajara jubatus’ was allegedly exported from Brazil in 1995 and is currently held by State Museum of Natural History Karlsruhe (SMNK) in Germany. It has attracted the attention of the scientific community not only because of its intrinsic interest but also for the controversy surrounding its export from Brazil...
Article
Full-text available
Scientific practices stemming from colonialism, whereby middle- and low-income countries supply data for high-income countries and the contributions of local expertise are devalued, are still prevalent today in the field of palaeontology. In response to these unjust practices, countries such as Mexico and Brazil adopted protective laws and regulati...
Article
Full-text available
The richly fossiliferous deposits of the Brazilian Pedra de Fogo Formation originated in an extensive aquatic system in tropical Pangaea, and grade from marginal lacustrine into marine deposits at the depocenter in the western part of the Parnaíba Basin. In addition to the well-known tetrapod and macrofloral records from these deposits, the Pedra d...
Conference Paper
Full-text available
Dentre os eustelos gimnospérmicos em rochas paleozoicas, existe um grupo denominado "Complexo Solenoide", caracterizado por um sistema especializado em secreção composto por canais/ductos resiníferos ou mucilaginosos na medula, o qual, é especialmente comum na província florística do Gondwana. Este sistema de canais/ductos tem sido considerado e ut...
Data
Resumen gráfico de "Excavando más profundo en las prácticas paleontológicas coloniales en el México y Brasil modernos"
Data
Resumo gráfico de "Aprofundando-se nas práticas colonialistas da paleontologia no México e no Brasil dos dias atuais"
Data
Graphical abstract for "Digging deeper into colonial palaeontological practices in modern day Mexico and Brazil"
Data
Versão integral traduzida do artigo "Digging deeper into colonial palaeontological practices in modern day Mexico and Brazil", publicado na revista Royal Society Open Science em março de 2022. Essa versão em Português faz parte do material suplementar do artigo original.
Article
Solenoid piths are formed by systems of secretory ducts or canals, and they are relatively common in petrified gymnosperms from the Permian of Gondwana. We described herein two new taxa, Polycanaloxylon merlottii gen. et sp. nov. and Europoxylon garapensis sp. nov., from the Pedra de Fogo Formation (Cisuralian), northeastern Brazil. In both species...
Data
Full presentation in English (with PT-BR subtitles) + 1 min. intro in Portuguese. Also available at: https://www.youtube.com/watch?v=vXdzTGAwB24
Conference Paper
Full-text available
Most publications on Brazil’s Araripe Basin fossils led by non-Brazilian authors do not report extraction and/or export permits, sometimes even admitting the fossils were commercially acquired (e.g. Irritator challengeri, Susisuchus anatoceps, Ludodactylus sibbicki, Lacusovagus magnificens, Unwindia trigonus, and Tapejara navigans). This represents...
Article
Full-text available
Provelosaurus americanus is the only known representative of the Pareiasauria in the Americas. This mid-size pareiasaur from the Rio do Rasto Formation of southern Brazil has been traditionally considered to be related to smaller forms from the South African Karoo known as the “dwarf pareiasaurs” of Lopingian age. P. americanus, however, co- existe...
Article
Recently collected temnospondyl fossils from the Cisuralian Pedra de Fogo Formation (north-eastern Brazil) indicate a diverse assemblage of aquatic tetrapods, including the dvinosaurs Timonya anneae and Procuhy nazariensis. Here we present revised diagnoses for these species and detailed descriptions of their holotypes. Timonya anneae is distinguis...
Article
This paper characterizes the ichnology and sedimentology of the Lower Paleozoic Parnaíba Basin beds exposed in the Poti River Canyon (Piauí State, NE Brazil) and discusses the paleoenvironmental significance of the ichnofauna. The sedimentary succession represents the Silurian–Devonian infill of the Parnaíba Basin and comprises mouth bar deposits (...
Chapter
The Permian petrified forests of the Parnaíba Basin represent an important part of the Brazilian Palaeobotany heritage. The stems show excellent preservation and have a high scientific, educative, and touristic potential. These forests, especially in the central part of the basin (Poti River Petrified Forest, Petrified Forest of the Garapenses Hill...
Presentation
https://www.youtube.com/watch?v=hFdL-Op_1jU
Article
Continuing the study of petrified gymnosperm trunks recovered from the Pedra de Fogo Formation, we identify here two new taxa from the Permian deposits of the Parnaíba Basin, northeastern Brazil. One taxon is an endemic form named Ductolobatopitys mussae Conceição, Neregato et Iannuzzi, nov. gen., nov. sp., characterized by solenoid, lobed and non-...
Article
Full-text available
The Pedra de Fogo Formation in the Parnaíba Basin of northeastern Brazil hosts a recently discovered lacustrine fauna and provides the only known record of the Captorhinidae in South America. Here, new captorhinid remains from this unit are described. Two partial mandibles, including one formerly ascribed to the genus Captorhinus, are here referred...
Article
Anatomically preserved gymnosperm stems are relatively abundant in the Permian outcrops of the Parnaíba Basin, but their anatomy has rarely been studied in detail. Here we describe two new fossil gymnosperm trunks from the Lower Permian (Cisuralian) strata of the Pedra de Fogo Formation in the municipality of Nova Iorque, southern Maranhão State, n...
Article
Two new tetrapod trackways are described from the Tapinocephalus Assemblage Zone of the South African Karoo Basin. We interpret both to be traces attributable to small anamniote tetrapods. The larger footprints are tentatively referred to aff. Batrachichnus salamandroides. These imprints are distinguished from other records of Batrachichnus by a pe...
Poster
Full-text available
Apresentação de fósseis localizados na área urbana de Teresina. Educação e patrimônio paleontológico.
Conference Paper
Full-text available
A Formação Rio do Rasto da Bacia do Paraná, no sul do Brasil, representa o final de um ciclo transgressivo-regressivo que resultou na continentalização da bacia, sendo depositado em sistemas fluvio-lacustres. É a única unidade estratigráfica do América do Sul a preservar faunas terrestres que indicam certa similaridade com faunas permianas da Bacia...
Article
Full-text available
Este artigo tem como objetivo fornecer análises preliminares e sugerir a elaboração de um modelo preditivo para a arqueologia no extremo sul do estado do Piauí, levando em consideração as características geoambientais da região e um sítio paleontológico e arqueológico no município de Corrente, Piauí. A área de estudo apresenta arenito silicificado...
Article
Full-text available
Although Permian fossils have been known from the Parnaíba Basin for two centuries, and some faunal and flora elements are well known worldwide, research on the fossil assemblages from this basin has lagged relative to other, more accessible basins. In the last decade, however, there has been a significant increase in the study of fossils from the...
Article
Full-text available
The Pedra de Fogo Formation dated from the early Permian (approximately 280 Mya), belongs to the sedimentary Parnaíba Basin, located in the northeastern region of Brazil. It is recognized by their well preserved plant fossil contents and it is notable for having several fossilized trunks in the life position. This study presents physical and/or che...
Article
In this paper we performed the study of two coprolites (fossilized feces) collected from the exposed levels of the Pedra de Fogo Formation, Parnaiba Sedimentary Basin, and Rio do Rasto Formation, Paraná Sedimentary Basin, both of the Palaeozoic era (Permian age). They were characterized using X-ray diffractometry, infrared, Raman and energy dispers...
Conference Paper
Full-text available
Preparación de un pequeño anfibio divinosaurio articulado proveniente del nivel inferior de la Formación Pedra do Fogo, Estado do Piauí, Brasil. El análisis del espécimen UFPI PV193 se basó en la irradiación del ejemplar por iluminación ultravioleta de onda larga 400-315nm. El enfoque de bajo costo y no destructivo utiliza un foco de calidad comerc...
Article
Full-text available
Abstract - New record of a Petrified Forest in Altos, Piauí: importance and strategies for geoconservation. Here were present a new record of fossil plants from the early Permian Pedra de Fogo Formation of the Parnaíba Basin, northeastern Brazil. This fossiliferous area, here named São Benedito Paleobotanical Site in municipality of Altos, Piauí st...
Article
Full-text available
The “Pedra de Fogo” Formation dated from the Permian period (approximately 280 million years ago), belongs to the sedimentary Parnaiba Basin, located in the northeastern region of Brazil. It is recognized by their well preserved fossil contents and it is notable for having several fossilized trunks in the growing position. Specimens from different...
Article
Full-text available
The “Pedra de Fogo” Formation dated from the Permian period (approximately 280 million years ago), belongs to the sedimentary Parnaiba Basin, located in the northeastern region of Brazil. It is recognized by their well preserved fossil contents and it is notable for having several fossilized trunks in the growing position. Specimens from different...
Data
CT-rendering of specimen UFPI PV001, holotype of Timonya anneae, cranium and partial postcranium. Rotation around the long axis of the skeleton.
Data
Supplementary Figure 1, Supplementary Table 1, Supplementary Note 1-2, Supplementary Discussion and Supplementary References
Article
Full-text available
Terrestrial vertebrates are first known to colonize high-latitude regions during the middle Permian (Guadalupian) about 270 million years ago, following the Pennsylvanian Gondwanan continental glaciation. However, despite over 150 years of study in these areas, the bio-geographic origins of these rich communities of land-dwelling vertebrates remain...
Article
Full-text available
Anomodontia was a highly successful tetrapod clade during the Permian and the Triassic. New morphological information regarding two bizarre basal anomodonts is provided and their palaeoecological significance is explored. The osteology of the recently discovered Tiarajudens eccentricus Cisneros et al. 2011, from the Brazilian Permian, is described...
Article
The Parnaiba Sedimentary Basin is of the Paleozoic age and is located in Northeast Brazil, covering the states of Piauí, Maranhão and Tocantins and a small part of Ceará and Pará. In this work we applied several chemical analytical techniques to characterize trunk fossils found in the Parnaíba Sedimentary Basin, collected from four different sites,...
Article
Full-text available
The medial Permian (~270-260 Ma: Guadalupian) was a time of important tetrapod faunal changes, in particular reflecting a turnover from pelycosaurian- to therapsid-grade synapsids. Until now, most knowledge on tetrapod distribution during the medial Permian has come from fossils found in the South African Karoo and the Russian Platform, whereas oth...
Article
The Parareptilia are a small but ecologically and morphologically diverse clade of Permian and Triassic crown amniotes generally considered to be phylogenetically more proximal to eureptiles (diapsids and their kin) than to synapsids (mammals and their kin). A recent supertree provides impetus for an analysis of parareptile diversity through time a...
Article
Full-text available
Anomodonts, a group of herbivorous therapsid "mammal-like reptiles," were the most abundant tetrapods of the Permian. We present a basal anomodont from South America, a new taxon that has transversally expanded palatal teeth and long saber canines. The function of the saber teeth is unknown, but probable uses include deterring attack from predators...
Article
Full-text available
A recent phylogenetic analysis of procolophonid parareptiles is used as the basis for a study of morphological diversity (disparity) in these amniotes. Disparity values are compared in three groups of procolophonids (a paraphyletic series of basal taxa and two monophyletic sister groups: procolophonines and leptopleuronines), two ecophenotypic asse...
Data
Rotation of vertebrae BP-1-5796, made from 180 neutron images in 180 angular degrees. (3.13 MB MPG)
Data
Parasagittal slices of vertebrae BP-1-5796, from left to right. (1.04 MB MP4)
Data
Transversal slices of vertebrae BP-1-5796, in posterior to anterior direction. (2.21 MB MP4)
Data
Coronal slices of vertebrae BP-1-5796, in ventral to dorsal direction. (1.17 MB MP4)
Article
Full-text available
The evidence of several forms of arthritis has been well documented in the fossil record. However, for pre-Cenozoic vertebrates, especially regarding reptiles, this record is rather scarce. In this work we present a case report of spondarthritis found in a vertebral series that belonged to a carnivorous archosaurian reptile from the Lower Triassic...
Article
Full-text available
The Middle Permian Tapinocephalus Assemblage Zone in South Africa has produced a rich record of tetrapods dominated by dinocephalian therapsids and pareiasaurid parareptiles. In this study we reassess the affinities of a specimen from this horizon previously identified as a procolophonoid and provide evidence that it is instead referable to a nycte...
Article
Full-text available
A histological analysis of the dentition of the small procolo− phonid parareptile Soturnia caliodon reveals detailed infor− mation concerning tooth implantation and replacement for this taxon. The presence of acrodont tooth implantation is ver− ified, which contradicts current models for procolophonid dentition. A heterogeneous enamel layer, that r...
Article
Full-text available
A second specimen of the poorly known millerettid Broomia perplexa is reported. It consists of a cranium and partially articulated postcranium. As indicated by its small size (ca. 35% shorter skull than the holotype) and unfused pelvis and limbs, the new specimen is a sub-adult individual. Comparison with the holotype reveals only minor differences...
Article
Full-text available
SYNOPSIS The phylogenetic intrarelationships of procolophonid parareptiles are determined via a comprehensive cladistic analysis using a data matrix of 21 taxa and 58 characters. Most taxa are in-cluded for the first time in a phylogenetic analysis and 27 characters are novel. The relationships within the group are more firmly resolved than in prev...
Article
A new procolophonid reptile, Kitchingnathus untabeni n. gen. et n. sp., is described from the uppermost strata of the Lystrosaurus Assemblage Zone of the Karoo Basin, South Africa. The new taxon co-occurs with the well-known Procolophon trigoniceps. The most distinctive feature of the new taxon is the presence of numerous small bicuspid molariforms...