Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil
Autor(a) principal: | |
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Data de Publicação: | 2007 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Anuário do Instituto de Geociências (Online) |
Texto Completo: | https://revistas.ufrj.br/index.php/aigeo/article/view/6707 |
Resumo: | The fossils studied came from outcrops of the Maecuru and Curuá rivers, State of Pará, belonging to the upper strata of the Maecuru Formation, Eifelian age. In this formation, two associations of marine benthic invertebrate can be identified, each inferring a distinct paleoenvironment. The association analyzed occurs in medium and coarse sandstones and shows "Schuchertella" agassizi and Ptychopeteria eschwegei as predominant organisms. It was idnetified 12 species of brachiopods, 20 species of bivalves, 12 of trilobites, 8 of gastropods, 6 of bellerophonts, 3 of crinoids and 3 of tentaculitids in this association. Brachiopods are the most abundant organisms, responsible for approximately 50% of it, followed by tentaculitids and bivalves. Trilobites, gastropods and bellerophonts sum less than 10% of the aforementioned association. Crinoids were not included in the quantitative analysis because they are only found as calicinal plates and disarticulated column disks. The brachiopods showed, through their morphofunctional characteristics, suspension feeders recumbent (free-lying) epifaunal life habit or a pedicle attached mode of life. The bivalves showed a predominant suspension feeder semiinfaunal habit, attached by byssus threads to the substratum, and an infaunal mode of life. All the trilobites showed a predator/scavenger and vagile epifaunal habit. The epifaunal platyceratids represents the gastropods with low mobility (coprophagous/suspension feeders). The bellerophonts showed an epifaunal highly/medium mobility and grazing/predator habit. The tentaculitids having a semi-infaunal, suspension feeder habit. The suspension feeder forms (brachiopods, bivalves and tentaculitids) account for over 90% of the organisms, with the remaining percentage distributed among the predator/scavenger (trilobites), coprophagous/suspension feeders (gastropods), grazers/ predators (bellerophonts) and deposit feeders (rare bivalves). The predominance of suspension feeder forms corroborates the environment inferred for the association, since suspension feeders adapt more easily to rough waters and coarse sediments. The life habits showed adaptations concerning a shallow marine environment with agitated waters, well-oxygenated, normal salinity and moderate temperatures. |
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Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, BrazilHábitos de vida da associação "Schuchertella" agassizi - Pthychopteria eschwegei, formação Maecuru, Devoniano, Bacia do Amazonas, BrasilThe fossils studied came from outcrops of the Maecuru and Curuá rivers, State of Pará, belonging to the upper strata of the Maecuru Formation, Eifelian age. In this formation, two associations of marine benthic invertebrate can be identified, each inferring a distinct paleoenvironment. The association analyzed occurs in medium and coarse sandstones and shows "Schuchertella" agassizi and Ptychopeteria eschwegei as predominant organisms. It was idnetified 12 species of brachiopods, 20 species of bivalves, 12 of trilobites, 8 of gastropods, 6 of bellerophonts, 3 of crinoids and 3 of tentaculitids in this association. Brachiopods are the most abundant organisms, responsible for approximately 50% of it, followed by tentaculitids and bivalves. Trilobites, gastropods and bellerophonts sum less than 10% of the aforementioned association. Crinoids were not included in the quantitative analysis because they are only found as calicinal plates and disarticulated column disks. The brachiopods showed, through their morphofunctional characteristics, suspension feeders recumbent (free-lying) epifaunal life habit or a pedicle attached mode of life. The bivalves showed a predominant suspension feeder semiinfaunal habit, attached by byssus threads to the substratum, and an infaunal mode of life. All the trilobites showed a predator/scavenger and vagile epifaunal habit. The epifaunal platyceratids represents the gastropods with low mobility (coprophagous/suspension feeders). The bellerophonts showed an epifaunal highly/medium mobility and grazing/predator habit. The tentaculitids having a semi-infaunal, suspension feeder habit. The suspension feeder forms (brachiopods, bivalves and tentaculitids) account for over 90% of the organisms, with the remaining percentage distributed among the predator/scavenger (trilobites), coprophagous/suspension feeders (gastropods), grazers/ predators (bellerophonts) and deposit feeders (rare bivalves). The predominance of suspension feeder forms corroborates the environment inferred for the association, since suspension feeders adapt more easily to rough waters and coarse sediments. The life habits showed adaptations concerning a shallow marine environment with agitated waters, well-oxygenated, normal salinity and moderate temperatures.Na Formação Maecuru podem ser reconhecidas duas associações de invertebrados marinhos bentônicos, cada qual representando um paleoambiente distinto. A associação analisada neste trabalho, presente em arenitos médios a grossos, apresenta como organismos predominantes "Schuchertella" agassizi (Rathbun, 1874) e Ptychopteria eschwegei (Clarke, 1899). Os fósseis estudados são oriundos de afloramentos nos rios Maecuru e Curuá, Estado do Pará, sendo procedentes dos estratos superiores da Formação Maecuru, de idade Eifeliana. Foram analisadas 337 amostras, coletadas pela Comissão Geológica do Império (1875-1877) e Expedição Orville A. Derby (1986). Compondo esta associação foram identificadas 12 espécies de braquiópodes, 20 de biválvios, 12 de trilobitas, 8 de gastrópodes, 6 de belerofontídeos, 3 de crinóides e 3 de tentaculitídeos. Os braquiópodes representam aproximadamente 50% da associação, seguidos pelos tentaculitídeos e biválvios. Trilobitas, gastrópodes e belerofontídeos totalizam menos de 10%. Os crinóides não foram incluídos na análise quantitativa, pois são encontrados apenas como placas calicinais e discos da coluna desarticulados. Os braquiópodes mostraram, através de suas características morfofuncionais, hábito suspensívoro epibentônico reclinante ou fixo por pedículo. Os biválvios apresentaram hábito suspensívoro semi-infaunístico endobissado, dominante, e infaunístico. Os trilobitas mostraram um hábito predador/necrófago, epibentônico móvel. Os gastrópodes platiceratídeos seriam epibentônicos de reduzida mobilidade (coprófagos/suspensívoros), enquanto os belerofontídeos teriam hábito epibentônico de média a alta mobilidade, pastador/ predador. Os tentaculitídeos seriam suspensívoros semi-infaunísticos. As formas suspensívoras representam mais de 90% dos organismos, sendo o percentual restante distribuído entre os predadores/necrófagos (trilobitas), coprófagos/suspensívoros (gastrópodes), pastadores/predadores (belerofontídeos) e depositívoros (raros biválvios). A predominância de suspensívoros corrobora o ambiente inferido de plataforma interna a média para a associação, pois os suspensívoros se adaptam melhor a águas agitadas e sedimentos grossos. A presença de formas suspensívoras epibentônicas e semi-infaunísticas, juntamente com os outros hábitos secundários, indica um ambiente marinho raso de águas agitadas, temperadas, bem oxigenadas e com salinidade normal.Universidade Federal do Rio de Janeiro2007-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://revistas.ufrj.br/index.php/aigeo/article/view/670710.11137/2007_1_135-144Anuário do Instituto de Geociências; Vol 30, No 1 (2007); 135-144Anuário do Instituto de Geociências; Vol 30, No 1 (2007); 135-1441982-39080101-9759reponame:Anuário do Instituto de Geociências (Online)instname:Universidade Federal do Rio de Janeiro (UFRJ)instacron:UFRJporhttps://revistas.ufrj.br/index.php/aigeo/article/view/6707/5304Copyright (c) 2007 Anuário do Instituto de Geociênciashttp://creativecommons.org/licenses/by/4.0info:eu-repo/semantics/openAccessPonciano, Luiza Corral Martins de OliveiraMachado, Deusana Maria da Costa2022-10-20T18:32:40Zoai:www.revistas.ufrj.br:article/6707Revistahttps://revistas.ufrj.br/index.php/aigeo/indexPUBhttps://revistas.ufrj.br/index.php/aigeo/oaianuario@igeo.ufrj.br||1982-39080101-9759opendoar:2022-10-20T18:32:40Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ)false |
dc.title.none.fl_str_mv |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil Hábitos de vida da associação "Schuchertella" agassizi - Pthychopteria eschwegei, formação Maecuru, Devoniano, Bacia do Amazonas, Brasil |
title |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
spellingShingle |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil Ponciano, Luiza Corral Martins de Oliveira |
title_short |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
title_full |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
title_fullStr |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
title_full_unstemmed |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
title_sort |
Life habits analysis of the "Schuchertella" agassizi-Pthychopteria eschwegei association, Maecuru formation, Devonian, Amazonas Basin, Brazil |
author |
Ponciano, Luiza Corral Martins de Oliveira |
author_facet |
Ponciano, Luiza Corral Martins de Oliveira Machado, Deusana Maria da Costa |
author_role |
author |
author2 |
Machado, Deusana Maria da Costa |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Ponciano, Luiza Corral Martins de Oliveira Machado, Deusana Maria da Costa |
description |
The fossils studied came from outcrops of the Maecuru and Curuá rivers, State of Pará, belonging to the upper strata of the Maecuru Formation, Eifelian age. In this formation, two associations of marine benthic invertebrate can be identified, each inferring a distinct paleoenvironment. The association analyzed occurs in medium and coarse sandstones and shows "Schuchertella" agassizi and Ptychopeteria eschwegei as predominant organisms. It was idnetified 12 species of brachiopods, 20 species of bivalves, 12 of trilobites, 8 of gastropods, 6 of bellerophonts, 3 of crinoids and 3 of tentaculitids in this association. Brachiopods are the most abundant organisms, responsible for approximately 50% of it, followed by tentaculitids and bivalves. Trilobites, gastropods and bellerophonts sum less than 10% of the aforementioned association. Crinoids were not included in the quantitative analysis because they are only found as calicinal plates and disarticulated column disks. The brachiopods showed, through their morphofunctional characteristics, suspension feeders recumbent (free-lying) epifaunal life habit or a pedicle attached mode of life. The bivalves showed a predominant suspension feeder semiinfaunal habit, attached by byssus threads to the substratum, and an infaunal mode of life. All the trilobites showed a predator/scavenger and vagile epifaunal habit. The epifaunal platyceratids represents the gastropods with low mobility (coprophagous/suspension feeders). The bellerophonts showed an epifaunal highly/medium mobility and grazing/predator habit. The tentaculitids having a semi-infaunal, suspension feeder habit. The suspension feeder forms (brachiopods, bivalves and tentaculitids) account for over 90% of the organisms, with the remaining percentage distributed among the predator/scavenger (trilobites), coprophagous/suspension feeders (gastropods), grazers/ predators (bellerophonts) and deposit feeders (rare bivalves). The predominance of suspension feeder forms corroborates the environment inferred for the association, since suspension feeders adapt more easily to rough waters and coarse sediments. The life habits showed adaptations concerning a shallow marine environment with agitated waters, well-oxygenated, normal salinity and moderate temperatures. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-01-01 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/6707 10.11137/2007_1_135-144 |
url |
https://revistas.ufrj.br/index.php/aigeo/article/view/6707 |
identifier_str_mv |
10.11137/2007_1_135-144 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
https://revistas.ufrj.br/index.php/aigeo/article/view/6707/5304 |
dc.rights.driver.fl_str_mv |
Copyright (c) 2007 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Copyright (c) 2007 Anuário do Instituto de Geociências http://creativecommons.org/licenses/by/4.0 |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
publisher.none.fl_str_mv |
Universidade Federal do Rio de Janeiro |
dc.source.none.fl_str_mv |
Anuário do Instituto de Geociências; Vol 30, No 1 (2007); 135-144 Anuário do Instituto de Geociências; Vol 30, No 1 (2007); 135-144 1982-3908 0101-9759 reponame:Anuário do Instituto de Geociências (Online) instname:Universidade Federal do Rio de Janeiro (UFRJ) instacron:UFRJ |
instname_str |
Universidade Federal do Rio de Janeiro (UFRJ) |
instacron_str |
UFRJ |
institution |
UFRJ |
reponame_str |
Anuário do Instituto de Geociências (Online) |
collection |
Anuário do Instituto de Geociências (Online) |
repository.name.fl_str_mv |
Anuário do Instituto de Geociências (Online) - Universidade Federal do Rio de Janeiro (UFRJ) |
repository.mail.fl_str_mv |
anuario@igeo.ufrj.br|| |
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1797053540111220736 |