New genera and species of Ostracoda from the Maastrichtian and Danian of the Neuquén Basin, Argentina

Ceolín, Daiane; Whatley, Robin C.; Fauth, Gerson; Concheyro, Andrea

doi:10.1002/spp2.1023

Cited by 12 publications

(56 citation statements)

References 32 publications

(65 reference statements)

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“…Stratigraphical and geographical distribution. Maastrichtian of Cerro Azul, General Roca (Ceolin et al 2015) and of El Matuasto, Jag€ uel Formation, Neuqu en Basin, Argentina (this study).…”

Section: Descriptionmentioning

confidence: 81%

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

Ceolin,

Santos Filho,

Concheyro

et al. 2024

Papers in Palaeontology

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This work presents a taxonomic, palaeoecological and palaeobiogeographical study of the ostracod fauna around the Cretaceous–Palaeogene boundary from the El Matuasto section, Neuquén Basin, Argentina. The analysis of 64 samples resulted in the recovery of 82 marine ostracod species, of which four are new: Hemiparacytheridea condilomata, Paramunseyella stictus, Hysterocythereis acuminata and Aleisocythereis? picnus. In addition, the genera Sapucariella, Monoceratina, Aracajuia, Microceratina and Pelecocythere are reported for the first time from the Neuquén Basin. Palaeoecological inferences indicate fluctuations in abundance and diversity, occurring alongside environmental change from an inner to medium shelf during the Maastrichtian and to an outer shelf in the Danian. The Maastrichtian fauna was less abundant than that in the Danian, which shows a rapid recovery after the Cretaceous–Palaeogene boundary. During the Danian, a small interval also shows a sudden decrease in abundance and diversity that could potentially be related to the Dan‐C2 event. In addition, the described genera and species in this study suggest a strong palaeobiogeographical affinity with the Paraíba Basin, northeastern Brazil.

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Section: Descriptionmentioning

confidence: 81%

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

Ceolin,

Santos Filho,

Concheyro

et al. 2024

Papers in Palaeontology

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“…A, geographical location of the study area Cerro Azul (star) in the General Roca province, Argentina (modified from Ceolin et al . ). B, schematic profile of a part of the sedimentary succession of the Jagüel and Roca formations (Cerro Azul section), with the distribution of the samples with ostracods used in this study.…”

Section: Geological and Geographical Contextmentioning

confidence: 97%

“…Micropaleontological studies have reported on ostracods (Bertels , ; Ceolin et al . ), foraminifers (Bertels ), nannofossils (Concheyro ) and palynomorphs (Barreda et al . ).…”

Section: Geological and Geographical Contextmentioning

confidence: 99%

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A small yet occasional meal: predatory drill holes in Paleocene ostracods from Argentina and methods to infer predation intensity

et al. 2019

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Ostracods are common yet understudied prey item in the fossil record. We document drill holes in Paleocene (Danian) ostracods from central Argentina using 9025 specimens representing 66 species. While the percentage of drilled specimens at assemblage-level is only 2.3%, considerable variation exists within species (0.3-25%), suggesting prey preference by the drillers. This preference is not determined by abundance because no significant correlation is found between species abundance and drilling percentages. Seven methods were used, some of which are new, to quantify drilling percentages for the abundant and commonly drilled Togoina argentinensis. The resulting range, from 9.9% to 14.6%, suggests that drilling percentages are fairly insensitive to the method used, implying that comparisons across studies are possible. This information, combined with data from the literature, suggests the Cretaceous-Palaeogene mass extinction may have had a limited effect on drilling intensity in ostracods. The cylindrical (Oichnus simplex) and parabolic (O. paraboloides) drill holes from Argentina may have been caused primarily by naticid and possibly muricid gastropods. Two oval drill holes (O. ovalis) are morphologically similar to octopod drill holes, but their small size, the fact that extant octopods are not known to drill ostracods and the absence of such holes in co-occurring gastropods, preclude ascription to a predator clade. Drill holes are located preferentially in the median and dorsal regions, where most soft tissue, including the adductor muscle, is located. Drilled specimens are statistically taller than non-drilled specimens for T. argentinensis and larger predators selected larger ostracods. The drilling percentage does not significantly differ in ornamented ostracods.

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“…In the present study the antiquity of the occurrence of Nodoconcha is confirmed and extended into the Danian and Maastrichtian. The new occurrence of seven species of Nodoconcha in the Neuquén Basin, well known for its rich fossil content, represents a place of species cluster and migration route for many species (Whatley & Ballent 1996;Ballent & Whatley 2006Piovesan et al 2012;Ceolin et al 2015).…”

mentioning

confidence: 99%

The Nodoconchiinae, a new subfamily of Cytheridae (Crustacea, Ostracoda)

Ceolín

Whatley

Fauth

et al. 2016

Journal of Micropalaeontology

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Hartmann (1989a) described two new genera, Austrocythere and Nodoconcha from the Oligocene and Recent. These genera were encountered in extremely cold conditions in the Antarctic. Hartmann classified Austrocythere as Cytheridae (Cytheride? sp. 1987; Austrocythere reticulotuberculata Hartmann 1989a). He found it in South Georgia, Lavoisier Island and Adelaide Island, at depths between 116 m and 215 m. The type locality of Austrocythere is South Georgia. Although Hartmann (1997) classified Austrocythere as family Cytheridae on the basis of both hard and soft parts, he classified Nodoconcha incertae sedis. However, the present authors believe that, because of its great similarity to Austrocythere, Nodoconcha is a member of the same family and subfamily. This is indeed suggested by Hartmann in his earlier works as listed in synonymy of Nodoconcha (see below).We have consulted a number of colleagues who all consider Nodoconcha to be Cytheridae. There have been some subsequent records of Austrocythere reticulotuberculata Hartmann from the

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New genera and species of Ostracoda from the Maastrichtian and Danian of the Neuquén Basin, Argentina

Cited by 12 publications

References 32 publications

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

Ostracods from the Cretaceous–Palaeogene boundary at El Matuasto Section, Neuquén Basin, Argentina: taxonomy, palaeoecological and palaeobiogeographical inferences

A small yet occasional meal: predatory drill holes in Paleocene ostracods from Argentina and methods to infer predation intensity

The Nodoconchiinae, a new subfamily of Cytheridae (Crustacea, Ostracoda)

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