Revisão sistemática e paleobiogeográfica de Trilobitas Phacopida (Homalonotidae e Calmoniidae) do Devoniano das Bacias do Parnaíba e Amazonas, Brasil

Meira, Felipe van Enck

doi:10.11606/t.44.2016.tde-28092016-135646

Cited by 2 publications

(3 citation statements)

References 22 publications

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“…venusta (Carvalho and Ponciano, 2015). In the Homalonotidae family, only Burmeisteria notica has been identified (Leme et al, 2013;Meira, 2014), with a width range of 22-40 mm (Leme et al, 2013), similar to the mean width of the Rusophycus specimens studied here (~35 mm). The sizes of the Metacryphaeus species differ, with M. kegeli being the smallest, ranging widthwise from ~7 to 23 mm (Carvalho et al, 1997), M. meloi ranging in width from ~17 to 31 mm (Carvalho et al, 1997;Leme et al, 2013), and M. tuberculatus ranging in width from approximately from 30 to 108 mm, with some complete specimens ranging lengthwise from 75 to 176 mm (Carvalho et al, 1997;Meira et al, 2016).…”

Section: Discussionsupporting

confidence: 76%

“…10.3389/fevo.2023.1117947 Frontiers in Ecology and Evolution 09 frontiersin.org as the main tracemaker of the studied Rusophycus specimens, mostly during the molting phase. However, the Parnaíba Basin has a limited record of trilobites, with only few species from the Calmonidae and Homalonotidae families (Ghilardi and Simões, 2007;Meira, 2014;Carbonaro et al, 2018). The most common genus within Calmonidae is Metacryphaeus, with three species recorded: M. tuberculatus, M. meloi, and M. kegeli (Carvalho et al, 1997;Leme et al, 2013;Meira, 2014;Meira et al, 2016;Carbonaro et al, 2018), along with a record of Eldredgeia cf.…”

Section: Discussionmentioning

confidence: 99%

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Multiple-Rusophycus assemblage from the Parnaíba Basin (NE Brazil) reflects trilobites as tracemakers and molting behavior

et al. 2023

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Trilobites inhabited all environments of Paleozoic seas, ranging from estuaries to continental slopes, and were globally distributed. Although their functional morphology and phylogenetic relations are established by well-preserved body fossils, the behavior of trilobites has received less attention. Three well-known trace fossils are interpreted to be produced by trilobitomorphs when preserved in Paleozoic rocks, Rusophycus (a resting trace), Cruziana (a furrowing trace), and Diplichnites (a locomotion trace). Those trace fossils unveil some aspects of trilobite behavior, but they were not investigated to test paleoecologic strategies based on morphometric parameters. This study uses Rusophycus to access the paleoecologic strategies of trilobites in storm-dominated shallow marine deposits of the Pimenteira and Cabeças formations (Middle to Upper Devonian, Parnaíba Basin, Brazil). It was conducted a detailed analysis of the Rusophycus specimens in a section that represents the transition between the Pimenteira and Cabeças formations (Parnaíba Basin). The width and length of the Rusophycus were measured, and statistical analyses were performed to understand the population characteristics. Relatively small-sized Rusophycus are dominant in such deposits, suggesting the dominance of young tracemakers and inferred r-strategist populations. The here reported multiple-Rusophycus assemblage reveals paleoecologic strategies of the population, and tiers relationship (cross-cutting epistratal and shallow-tier trace fossils such as Bergaueria, Palaeophycus, and Protopaleodictyon) indicate deep Rusophycus. The main reason for those burrowing activities deep in the substrate might be protection during ecdysis. Thus, the random distribution, lack of hunting evidence, and depth of Rusophycus suggest molting activity as the trigger for their production in storm-influenced beds of the Pimenteira Formation, probably by calmoniids or homalonotids.

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Section: Discussionsupporting

confidence: 76%

Section: Discussionmentioning

confidence: 99%

Multiple-Rusophycus assemblage from the Parnaíba Basin (NE Brazil) reflects trilobites as tracemakers and molting behavior

et al. 2023

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“…Other studies showed results similar to these, with 22.71% of fetal deaths having intrauterine hypoxia as the registered cause and 20.8% as death without explanation 19 . Jacinto et al 20 found intrauterine hypoxia as the cause of fetal death in 44.7% of cases.…”

Section: Discussionsupporting

confidence: 72%

Analysis of the perinatal mortality rate in the metropolitan region of grande Vitória, Espírito Santo, Brazil, between 2008 and 2017

Zuqui Ribeiro,

Ribeiro Macedo,

Rabello Laignier

et al. 2023

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Introduction: perinatal mortality is characterized by fetal deaths that occur after the 22nd week of management and neonatal deaths that precede six full days of life. This indicator has been a matter of concern and discussion on the part of entities and organizations involved in comprehensive health care for women and children. Objective: to characterize perinatal deaths in the Metropolitan Region of Greater Vitória (RMGV) in Espírito Santo and identify associated maternal factors in the period between 2008 and 2017. Methods: ecological and descriptive study with a quantitative approach, carried out in 2019 on perinatal mortality from 2008 to 2017 at RMGV. Data collection was performed by extracting data from the SIM, SINASC, IBGE databases of the Espírito Santo State Health Department, about perinatal deaths and associated maternal factors. The research respects the ethical precepts of resolution 466/12 of the National Health Council. Results: the distribution of deaths did not occur homogeneously in the municipalities in the RMGV. The municipality of Vitória had the lowest perinatal mortality rates during the study period, on the other hand, in the comparative analysis between the different municipalities that make up the RMGV, the municipality of Fundão presents the worst scenario regarding perinatal mortality over the years. Regarding the underlying causes of death, it is noted that in this study, the three causes with the highest number of occurrences are complications of the placenta, umbilical cord and maternal affections, not necessarily related to the current pregnancy and intrauterine hypoxia. Conclusion: there were no significant changes in mortality rates in the Metropolitan Region of Greater Vitória. However, the main deaths occurred in neighborhoods with greater socioeconomic inequalities. Maternal causes were highly representative of deaths, raising issues associated with the improvement of public health policies.

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Revisão sistemática e paleobiogeográfica de Trilobitas Phacopida (Homalonotidae e Calmoniidae) do Devoniano das Bacias do Parnaíba e Amazonas, Brasil

Abstract: iv teria se dado a sudoeste desta bacia, já que Malvinella ocorre apenas nesta bacia e na Bolívia.

Cited by 2 publications

References 22 publications

Multiple-Rusophycus assemblage from the Parnaíba Basin (NE Brazil) reflects trilobites as tracemakers and molting behavior

Multiple-Rusophycus assemblage from the Parnaíba Basin (NE Brazil) reflects trilobites as tracemakers and molting behavior

Analysis of the perinatal mortality rate in the metropolitan region of grande Vitória, Espírito Santo, Brazil, between 2008 and 2017

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