A Possible Tracemaker for<i>Arthrophycus Alleghaniensis</i>

McCoy, Victoria E.; Strother, Paul K.; Briggs, Derek E. G.

doi:10.1666/11-133r1.1

Cited by 10 publications

(3 citation statements)

References 38 publications

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“…A. alleghaniensis has a worldwide distribution with occurrences registered, since the Ordovician to the Silurian, in the Nhamundá Formation, early Silurian of the Amazonas Basin (Nogueira et al, 1999), lower Silurian of the Appalachian Basin, eastern USA (McCoy et al, 2012), Adigrat Sandstone, Ordovician in south-central Eritrea (Kumpulainen et al, 2006) and in the Hawaz Fornation, Ordovician of the Murzuq Basin in Al Barkat in South of Gant, Asia (Worsley, 2000). So considering this, only the occurrence of A. alleghaniensis is not a good dating tool, and the occurrence in the upper portion of Vila Maria Formation, cannot provide, by itself, a confident age as Silurian for this interval.…”

Section: Biostratigraphic and Paleogeographic Considerationsmentioning

confidence: 99%

The earliest Ostracoda record from Brazil: Vila Maria Formation, Rio Ivaí Group, Paraná Basin, Central Brazil

Adôrno¹,

Carmo²,

Salas³

et al. 2017

Rev. bras. paleontol.

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-Two species of Ostracoda are described for the first time from the parastratotype-section of Vila Maria Formation; this section is 30 m thick, located on the northern border of the Paraná Basin. The Vila Maria Formation records the Upper Ordovician-Lower Silurian boundary of the Paraná Basin in Bom Jardim de Goiás, State of Goiás, central Brazil. The new species represents the earliest Ostracoda occurrence from Brazilian strata. Delicate internal and external molds of isolated valves are abundant in the basal portion of the parastratotype-section of Vila Maria Formation. This interval comprises black shales that record post-glacial marine transgression, overlapping the Upper Ordovician glacial sequence of the Iapó Formation. The paleogeographic reconstruction indicates that deposition of the basal portion of the Vila Maria Formation took place in high-latitude, cool water conditions at the margin of Gondwana, under similar environmental conditions to the Djeffara Formation in the Ghadames Basin and the Tichitt Group in the Taoudeni Basin, both in the Northern Africa.Key words: Ostracoda, Ordovician, Paraná Basin.RESUMO -Duas espécies de Ostracoda têm ocorrências inéditas descritas a partir da seção-tipo suplementar da Formação Vila Maria, seção que tem 30 m de espessura, localizada na borda norte da Bacia do Paraná. A Formação Vila Maria está posicionada no limite Ordoviciano Superior-Siluriano inferior da Bacia do Paraná na região de Bom Jardim de Goiás, Estado de Goiás, Brasil central. As novas espécies descritas representam a ocorrência mais antiga de Ostracoda de estratos brasileiros. Moldes internos e externos de valvas isoladas são abundantes na porção basal da seção-tipo suplementar da Formação Vila Maria. Este intervalo é constituído por folhelhos pretos representando a transgressão marinha pós-glacial, sobrepostos aos diamictitos da Formação Iapó, que representa a sequência glacial do Neordoviciano na Bacia do Paraná. A reconstrução paleogeográfica indica que a deposição da porção basal da Formação Vila Maria ocorreu sob condições de altas latitudes e águas frias na margem de Gondwana, onde atualmente se localiza a América do Sul, sob condições semelhantes àquelas das Formações Djeffara na Bacia de Ghadames e Tichitt Group na Bacia do Taoudeni onde atualmente se localiza a porção norte da África.Palavras-chave: Ostracoda, Ordoviciano, Bacia do Paraná.

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Section: Biostratigraphic and Paleogeographic Considerationsmentioning

confidence: 99%

The earliest Ostracoda record from Brazil: Vila Maria Formation, Rio Ivaí Group, Paraná Basin, Central Brazil

Adôrno¹,

Carmo²,

Salas³

et al. 2017

Rev. bras. paleontol.

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“…Six such segments exist in other peracarids but these are very different in shape [22]. From its discovery to its last observation in 1985 [23] the fossil has successively been assigned to peracarids [20,[24][25][26][27][28][29], phyllocarids [29], euthycarcinoids [30], arachnomorphs [31][32][33] or other arthropods [30][31][32][33][34][35]. Here, we re-analyse the visible and hidden anatomy of this continental (freshwater) arthropod using a combination of standard light photography and newly developed luminescence-based imaging methods, and undertake a cladistic analysis to investigate its position within malacostracan crustaceans.…”

Section: Introductionmentioning

confidence: 99%

The oldest peracarid crustacean reveals a Late Devonian freshwater colonization by isopod relatives

et al. 2021

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Peracarida (e.g. woodlice and side-swimmers) are, together with their sister-group Eucarida (e.g. krill and decapods), the most speciose group of modern crustaceans, suggested to have appeared as early as the Ordovician. While eucarids' incursion onto land consists of mainly freshwater and littoral grounds, some peracarids have evolved fully terrestrial ground-crawling ecologies, inhabiting even our gardens in temperate regions (e.g. pillbugs and sowbugs). Their fossil record extends back to the Carboniferous and consists mainly of marine occurrences. Here, we provide a complete re-analysis of a fossil arthropod— Oxyuropoda— reported in 1908 from the Late Devonian floodplains of Ireland, and left with unresolved systematic affinities despite a century of attempts at identification. Known from a single specimen preserved in two dimensions, we analysed its anatomy using digital microscopy and multispectral macroimaging to enhance the contrast of morphological structures. The new anatomical characters and completeness of Oxyuropoda , together with a phylogenetic analysis with representatives of all major Eumalacostraca groups, indicate that Oxyuropoda is a crown peracarid, part of a clade including amphipods and isopods. As such, Oxyuropoda is the oldest known species Peracarida, and provides evidence that derived peracarids had an incursion into freshwater and terrestrial environments as early as the Famennian, more than 360 Ma.

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“…Six such segments exist in other peracarids but these are very different in shape [22]. From its discovery to its last observation in 1985 [23] the fossil has successively been assigned to peracarids [20,[24][25][26][27][28][29], phyllocarids [29], euthycarcinoids [30], arachnomorphs [31][32][33] or other arthropods [30][31][32][33][34][35]. Here, we re-analyze the visible and hidden anatomy of this continental (freshwater) arthropod using a combination of standard light photography, and newly developed luminescence-based imaging methods, and undertake a cladistic analysis to investigate its position within malacostracan crustaceans.…”

Section: Introductionmentioning

confidence: 99%

The oldest peracarid crustacean reveals a Late Devonian freshwater colonisation by isopod relatives

Robin

Guériau

Luque

et al. 2021

Preprint

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Peracarida (e.g., woodlice & side-swimmers) are, together with their sister-group Eucarida (e.g. krill & decapods), the most speciose group of modern crustaceans, suggested to have appeared as early as the Ordovician. While eucarids incursion onto land consists of mainly freshwater and littoral grounds, some peracarids have evolved fully terrestrial ground-crawling ecologies, inhabiting even our gardens in temperate regions (e.g. pillbugs and sowbugs). Their fossil record extends back to the Carboniferous and consists mainly of marine occurrences. Here, we provide a complete re-analysis of a fossil arthropod, Oxyuropoda, reported in 1908 from the Late Devonian floodplains of Ireland, and left with unresolved systematic affinities despite a century of attempts at identification. Known from a single specimen preserved in two-dimensions, we analysed its anatomy using digital microscopy and multispectral macro-imaging to enhance contrast of morphological structures. The new anatomical characters and completeness of Oxyuropoda, together with a phylogenetic analysis with representatives of all major Eumalacostraca groups, indicate that Oxyuropoda is a crown-peracarid, part of a clade including amphipods and isopods. As such, Oxyuropoda is the oldest known Peracarida, and provides evidence that derived peracarids had an incursion into freshwater and terrestrial environments as early as the Famennian, more than 360 million years ago.

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A Possible Tracemaker forArthrophycus Alleghaniensis

Cited by 10 publications

References 38 publications

The earliest Ostracoda record from Brazil: Vila Maria Formation, Rio Ivaí Group, Paraná Basin, Central Brazil

The earliest Ostracoda record from Brazil: Vila Maria Formation, Rio Ivaí Group, Paraná Basin, Central Brazil

The oldest peracarid crustacean reveals a Late Devonian freshwater colonization by isopod relatives

The oldest peracarid crustacean reveals a Late Devonian freshwater colonisation by isopod relatives

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