First record of Lower Silurian conodonts from South America: biostratigraphic and palaeobiogeographic implications of Llandovery conodonts in the Precordillera of Argentina

1999 ◽  
Vol 136 (2) ◽  
pp. 119-131 ◽  
Author(s):  
OLIVER LEHNERT ◽  
STIG M. BERGSTRÖM ◽  
J. L. BENEDETTO ◽  
N. EMILIO VACCARI
Keyword(s):  
South America ◽  
North Atlantic ◽  
First Record ◽  
South American ◽  
Upper Ordovician ◽  
Low Latitude ◽  
Tropical Zone ◽  
Lower Silurian ◽  
Central Argentina ◽  
Conodont Fauna

A collection of conodonts, including Dapsilodus obliquicostatus (Branson & Mehl), Distomodus cf. kentuckyensis Branson & Branson, Ozarkodina oldhamensis (Rexroad), and Panderodus sp., has been obtained from brachiopod coquinas in the lower part of the La Chilca Formation in the Precordillera of west-central Argentina. This conodont fauna, the first to be recorded from the Llandovery in South America, can be referred to the D. kentuckyensis Biozone, and is interpreted to represent an interval in the middle Rhuddanian to lower Aeronian stages. This age assignment is supported by graptolite data from the lower third of the La Chilca Formation beneath the conodont-bearing interval. The brachiopods associated with the conodonts belong to the Afro-South American Realm, but include a high percentage of North Atlantic and cosmopolitan genera. The conodont taxa present are widespread in the tropical zone (Laurentia, Baltica, etc.). This suggests that the pronounced conodont faunal provicialism in the Upper Ordovician had disappeared in the Lower Silurian, where high- and low-latitude conodont faunas appear to be closely similar.

Hoplonannus australis sp. nov. (Hemiptera, Schizopteridae): amended diagnosis of the genus and first record from South America

Zootaxa ◽  
2019 ◽  
Vol 4568 (2) ◽  
pp. 394
Author(s):  
DIEGO DUTRA SILVEIRA ◽  
ALINE BARCELLOS ◽  
ALEXANDER KNYSHOV
Keyword(s):  
New Species ◽  
South America ◽  
Central America ◽  
First Record ◽  
South American ◽  
South American Species ◽  
The Right ◽  
New Diagnosis

Hoplonannus McAtee & Maloch, 1925 comprises three species described from Central America. Females of all these species are known only from brachypterous specimens. This paper describes the first South American species of the genus, Hoplonannus australis sp. nov. The new species differs from its congeners, in females, by the submacroptery, presence of ocelli and a basal bulge in the seventh sternite; in males, it differs by the presence of a process in the eighth tergite and the right paramere bifurcate apically, with branches subparallel. These traits entail a new diagnosis for the genus. 

Biostratigraphy and paleobiogeography of Middle and Late Ordovician conodonts from the Langkawi Islands, northwestern peninsular Malaysia

2008 ◽  
Vol 82 (5) ◽  
pp. 957-973 ◽  
Author(s):  
Sachiko Agematsu ◽  
Katsuo Sashida ◽  
Amnan B. Ibrahim
Keyword(s):  
North Atlantic ◽  
Peninsular Malaysia ◽  
Late Ordovician ◽  
Upper Ordovician ◽  
Low Latitude ◽  
Cool Water ◽  
Middle Ordovician ◽  
Water Conditions ◽  
Unidentified Species ◽  
Assemblage Zone

The Middle and Upper Ordovician sequence of the Langkawi Islands, northwestern peninsular Malaysia, contains 20 species of conodonts belonging to 15 genera and four unidentified species, which are described and illustrated. The following four biostratigraphic zones are established for the study area: the Scolopodus striatus assemblage zone, the Periodon sp. A range zone, the Baltoniodus alobatus range zone, and the Hamarodus europaeus range zone, in ascending order. The Middle Ordovician fauna belongs to the low-latitude, warm-water Australian Province. Conodonts of the H. europaeus zone represent the HDS (Hamarodus europaeus-Dapsilodus mutatus-Scabbardella altipes) biofacies, which has been reported from the cool-water North Atlantic Faunal Region. The middle Arenigian limestones in the study area were deposited on a shallow-water shelf, whereas the late Arenigian to middle Darriwilian limestones formed in hemipelagic deeper-water conditions on an outer shelf or slope.

scholarly journals First record in Africa of the parasitoid Dolichogenidea gelechiidivoris (Hymenoptera: Braconidae) on tomato leafminer Tuta absoluta (Lepidoptera: Gelechiidae) from tomato fields in Algeria

2021 ◽  
Vol 88 ◽  
pp. 115-131
Author(s):  
Farial Krache ◽  
Malika Boualem ◽  
Jose Fernandez-Triana ◽  
Amber Bass ◽  
Judit Arnó ◽  
...  
Keyword(s):  
South America ◽  
Parasitoid Wasp ◽  
First Record ◽  
Biocontrol Agents ◽  
Tuta Absoluta ◽  
South American ◽  
Tomato Leafminer ◽  
South American Tomato Pinworm ◽  
First Time ◽  
Tomato Pinworm

The Neotropical parasitoid wasp Dolichogenidea gelechiidivoris (Marsh, 1975) (Hymenoptera: Braconidae), one of the most important biocontrol agents of the South American tomato pinworm Tuta absoluta (Meyrick, 1917) (Lepidoptera: Gelechiidae), is reported for the first time from Africa, from tomato grown in open fields and greenhouses in several regions of Algeria. Color photos of specimens from Algeria, Spain and South America, as well as the holotype and one paratype are provided. Morphological and molecular details to better characterize and recognize the species are also provided. We speculate that D. gelechiidivoris arrived accidentally to Algeria from Spain, where it has recently been reported. The consequences for future biocontrol projects against T. absoluta in Africa are discussed.

First record and a new species of Megarthrus Curtis (Coleoptera, Staphylinidae, Proteininae) from the Colombian Central Andes

Zootaxa ◽  
2011 ◽  
Vol 2916 (1) ◽  
pp. 62
Author(s):  
MARGARITA M. LÓPEZ-GARCÍA ◽  
DIANA M. Méndez-Rojas ◽  
JOSÉ LUÍS NAVARRETE-HEREDIA
Keyword(s):  
New Species ◽  
South America ◽  
Central America ◽  
First Record ◽  
Central Andes ◽  
South American ◽  
The South ◽  
The World ◽  
Northern South America ◽  
A New Species

The genus Megarthrus Curtis 1829 with about 139 species described around the world, is the largest of the subfamily Proteininae (Coleoptera: Staphylinidae) (Cuccodoro 2011). Megarthrus is distributed worldwide (Cuccodoro 1999) but it is apparently more diverse in the Holartic region (Navarrete-Heredia et al. 2002). However, the South American fauna is underestimated because many of the collected specimens are not yet described (Cuccodoro 2011). Newton et al. (2005) cited the genus as probable in Colombia because some species are known from Central America and northern South America, but until now, no species has been published from Colombia. Therefore, M. andinus sp. nov. represents the first record of the genus and subfamily for this country.

scholarly journals Insecta, Hymenoptera, Vespoidea, Pompilidae, Epipompilus aztecus (Cresson, 1869): first record in South America

Check List ◽  
2010 ◽  
Vol 6 (4) ◽  
pp. 483 ◽  
Author(s):  
Rogério Silvestre ◽  
Tiago Henrique Auko ◽  
Vander Carbonari
Keyword(s):  
United States ◽  
New Zealand ◽  
South America ◽  
Central America ◽  
First Record ◽  
Neotropical Region ◽  
South American

The genus Epipompilus occurs throughout the Neotropical region, United States, Australia and New Zealand. South American members of this genus appear to have evolved separately from the others Pompilidae for a considerably time. E. aztecus was initially recorded only for Mexico and Central America. Our record expands the distribution of E. aztecus to South America, bringing new perspectives to the biogeography of spider wasps.

A probable glacio-marine deposit of Late Ordovician—Early Silurian age from the north central Newfoundland Appalachian Belt

1974 ◽  
Vol 111 (6) ◽  
pp. 549-564 ◽  
Author(s):  
A. M. McCann ◽  
M. J. Kennedy
Keyword(s):  
North Atlantic ◽  
Late Ordovician ◽  
Mobile Belt ◽  
North Atlantic Region ◽  
Upper Ordovician ◽  
Atlantic Region ◽  
North Central ◽  
Marine Deposits ◽  
Lower Silurian ◽  
The North

SummaryConglomerate beds occur in an Upper Ordovician—Lower Silurian clastic sequence on the northeastern side of the Newfoundland Central Paleozoic Mobile Belt. They contain scattered pebbles and cobbles dispersed in a finely laminated sandstone and siltstone matrix. Laminations are generally 5–20 mm thick and the clasts 10–300 mm across. The laminations are locally disrupted by the clasts. These laminations have subsequently been tectonically flattened into augen around the clasts and locally disrupted by boudinage. It is concluded that these conglomerate beds represent icerafted glacio-marine deposits interbedded with turbidites which were probably deposited in a locally restricted marine environment. The deposits are interpreted on the basis of scattered fossil localities as being of Late Ordovician–Early Silurian age. They are compared with deposits of similar age elsewhere in the North Atlantic region.

scholarly journals Nasal mites (Mesostigmata, Rhinonyssidae) in Sternidae (Aves: Charadriiformes) on the southern Coast of Brazil

2018 ◽  
Vol 27 (1) ◽  
pp. 109-111 ◽  
Author(s):  
Diego Silva da Silva ◽  
Simone Scheer ◽  
Gertrud Muller
Keyword(s):  
South America ◽  
Respiratory System ◽  
First Record ◽  
Neotropical Region ◽  
Mite Species ◽  
South American ◽  
Sterna Hirundo ◽  
Southern Coast ◽  
The Family ◽  
The World

Abstract Six species of birds of the family Sternidae are often found on the southern coast of South America. Sterna trudeaui, S. hirundinacea, Thalasseus maximus, T. acuflavidus and Sternula superciliaris are South American residents and Sterna hirundo, a Nearctic migrant. At least 500 species of nasal mites have been described around the world, and Rhinonyssidae is the most diverse family. These mites are bloodsucking endoparasites that inhabit the respiratory system of birds. This study aimed to report on occurrences of nasal mites in Sternidae on the southern coast of Brazil. Of the 106 birds analyzed, 8.5% (9 birds) were parasitized by nasal mites. This report provides the first record in the Neotropical region for two mite species, Sternostoma boydi and Larinyssus orbicularis parasitizing Thalasseus acuflavidus and Sternula superciliaris. No nasal mites were found in Sterna trudeaui or Thalasseus maximus. One host individual (T. acuflavidus) was parasitized by two species of nasal mites, S. boydi and L. orbicularis.

scholarly journals The Nature of a Heat Wave in Eastern Argentina Occurring during SALLJEX

2007 ◽  
Vol 135 (3) ◽  
pp. 1165-1174 ◽  
Author(s):  
S. Bibiana Cerne ◽  
Carolina S. Vera ◽  
Brant Liebmann
Keyword(s):  
South America ◽  
Heat Wave ◽  
Strong Impact ◽  
South American ◽  
Atmospheric Conditions ◽  
The South ◽  
Low Level ◽  
Central Argentina ◽  
Temperature Advection ◽  
Low Level Jet

Abstract This note describes the physical processes associated with the occurrence of a heat wave over central Argentina during the austral summer of 2002/03, during which the South American Low-Level Jet Experiment (SALLJEX) was carried out. The SALLJEX heat wave that lasted between 25 January and 2 February 2003 was punctuated by extreme conditions during its last 3 days, with the highest temperature recorded over the last 35 yr at several stations of the region. It was found that not only the activity of synoptic-scale waves, but also the intraseasonal oscillation variability, had a strong impact on the temperature evolution during this summer. During the weeks previous to the heat wave development, an intensified South Atlantic convergence zone (SACZ) dominated the atmospheric conditions over tropical South America. Temperatures started to increase in the subtropics due to the subsidence and diabatic warming associated with the SACZ, as depicted by SALLJEX upper-air observations. An extratropical anticyclone that evolved along southern South America further intensified subsidence conditions. By the end of January the warming processes associated with SACZ activity weakened, while horizontal temperature advection began to dominate over central Argentina due to the intensification of the South American low-level jet. This mechanism led to temperature extremes by 2 February with temperature anomalies at least two standard deviations larger than the climatological mean values. Intense solar heating favored by strong subsidence was responsible for the heat wave until 31 January, after which horizontal temperature advection was the primary process associated with the temperature peak.

Eocene birds from the western margin of southernmost South America

2010 ◽  
Vol 84 (6) ◽  
pp. 1061-1070 ◽  
Author(s):  
Michel A. Sallaberry ◽  
Roberto E. Yury-Yáñez ◽  
Rodrigo A. Otero ◽  
Sergio Soto-Acuña ◽  
Teresa G. Torres
Keyword(s):  
South America ◽  
Southern Hemisphere ◽  
First Record ◽  
South American ◽  
American Continent ◽  
Western Margin ◽  
Geological Units ◽  
South American Continent ◽  
Previous Assumption ◽  
Seymour Island

This study presents the first record of Eocene birds from the western margin of southernmost South America. Three localities in Magallanes, southern Chile, have yielded a total of eleven bird remains, including Sphenisciformes (penguins) and one record tentatively assigned to cf. Ardeidae (egrets). Two different groups of penguins have been recognized from these localities. The first group is similar in size to the smallest taxa previously described from Seymour Island, Marambiornis Myrcha et al., 2002, Mesetaornis Myrcha et al., 2002, and Delphinornis Wiman, 1905. The second recognized group is similar in size to the biggest taxa from Seymour Island; based on the available remains, we recognize the genus Palaeeudyptes Huxley, 1859, one of the most widespread penguin genera in the Southern Hemisphere during the Eocene. The stratigraphic context of the localities indicates a certain level of correlation with the geological units described on Seymour Island. The newly studied materials cast more light on the paleobiogeography of the group, extending the known ranges to the South American continent. In addition to the newly discovered birds, the presence of several taxa of elasmobranchs previously recovered exclusively from Eocene beds in the Southern Hemisphere help to clarify the age of the studied localities, widely discussed during the last decades. This paper verifies the presence of extensive Eocene sedimentary successions with fossil vertebrates along the western margin of southern South America, contrary to the previous assumption that such a record is lacking in Chile.

South American climatic response to changes in the tropical South Atlantic Ocean hydrography during Termination 1

2020 ◽  
Author(s):  
Karl J. F. Meier ◽  
Andrea Jaeschke ◽  
Julia Hoffmann ◽  
Barbara Hennrich ◽  
Oliver Friedrich ◽  
...  
Keyword(s):  
South America ◽  
High Latitude ◽  
South Atlantic ◽  
Convergence Zone ◽  
South American ◽  
The South ◽  
Low Latitude ◽  
Brazil Current ◽  
South American Climate ◽  
Tropical South America

<p>Rapid climatic reorganizations during the last Termination (i.e. Heinrich Stadials 0-1) had major impacts on the Atlantic Meridional Overturning Circulation (AMOC) strength and on global atmospheric circulation patterns. However, if and how this high-latitude forcing affected low-latitude climate variability is still poorly constrained. Here we present a high-resolution multi-proxy record from marine sediment core M125-3-35 recovered in the western tropical South Atlantic combining foraminiferal Mg/Ca, Ba/Ca ratios, stable oxygen isotope measurements and organic biomarker-based sea surface temperature (SST) proxies (TEX86 and UK’37). The near-shore core position of M125-3-35 off the Paraíba do Sul river mouth in southeastern Brazil and the means of foraminiferal Ba/Ca ratios, which depends on the quantity of continental freshwater input, enables us to investigate direct coupling of continental hydroclimate and oceanographic changes.</p><p>The data show a complex interplay of oceanic and atmospheric forcing dominating the tropical South American climate, which is mainly controlled by the strength and position of the Intertropical Convergence Zone (ITCZ) and South Atlantic Convergence Zone (SACZ). During times of weakest AMOC in Heinrich Stadial 1 (HS1) , a distinct SST peak in the tropical South Atlantic points to an enhanced Brazil Current and strong recirculation of heat within the southern hemisphere. Further, wet conditions prevailed during this time in tropical South America caused by a maximum southward shift of the ITCZ. This happened in coincidence with a temperature drop and weakening of the North Brazil Current (NBC) in the tropical North Atlantic (Bahr et al., 2018) as result of maximum AMOC slowdown. Therefore, for the first time, we reveal a clear seesaw-like pattern of the NBC and BC during times of abrupt AMOC variability.</p><p>While HS1 is generally characterized by a warm and wet anomaly in our record, Ba/Ca ratios and SST show a distinct centennial-scale alternation between warmer (colder) and wetter (drier) phases indicating a distinct climate instability during this climatic phase. A distinct offset exists between SST reconstructed using Mg/Ca, TEX86, and UK’37 which points to strong seasonal differences in the oceanographic settings and/or changes in the terrestrial input from the south American continent. These findings illustrate the strong sensitivity of hydroclimate variability in tropical South America to oceanic forcing as expected also during future climate change, in line with recent studies that showed a severe impact on modern South American climate by changes in (tropical) South Atlantic SSTs (Rodrigues et al., 2019, Utida et al., 2018).</p><p> </p><p>Bahr, A., Hoffmann, J., Schönfeld, J., Schmidt, M. W., Nürnberg, D., Batenburg, S. J., & Voigt, S. (2018). Low-latitude expressions of high-latitude forcing during Heinrich Stadial 1 and the Younger Dryas in northern South America. <em>Global and Planetary Change, 160</em>, 1-9.</p><p>Rodrigues, R. R., Taschetto, A. S., Gupta, A. S., & Foltz, G. R. (2019). Common cause for severe droughts in South America and marine heatwaves in the South Atlantic. <em>Nature Geoscience, 12</em>(8), 620-626.</p><p>UTIDA, Giselle, et al. Tropical South Atlantic influence on Northeastern Brazil precipitation and ITCZ displacement during the past 2300 years. <em>Scientific reports</em>, 2019, 9. Jg., Nr. 1, S. 1698.</p>

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