Blancan camelids from San Miguel de Allende, Guanajuato, central México

2010 ◽  
Vol 84 (1) ◽  
pp. 51-65 ◽  
Author(s):  
E. Jiménez-Hidalgo ◽  
O. Carranza-Castañeda
Keyword(s):  
North America ◽  
Geographic Distribution ◽  
Time Frame ◽  
Feeding Strategies ◽  
Central Mexico ◽  
Point Bar ◽  
Fossil Material ◽  
The Family ◽  
San Miguel De Allende

During the Pliocene, the diversification of the tribes Lamini and Camelini of the Family Camelidae took place in most of North America, but at present in Mexico the systematics of Pliocene Camelidae are poorly known. Fossil material described in this paper was recovered from Blancan I and Blancan III age floodplain and point bar deposits of the San Miguel de Allende basin, Guanajuato state, central Mexico, which approximately spans a time frame from 4.7 to 3.0 Ma. The identified taxa include the lamines Hemiauchenia blancoensis (Meade) 1945, Hemiauchenia gracilis Meachen, 2005, Blancocamelus meadei Dalquest, 1975 and Camelops sp., while the camelines are represented by Megatylopus sp. The records of H. gracilis and B. meadei in the Pliocene of central Mexico are the oldest in North America. Previous studies of the probable feeding strategies of these taxa indicate that they were browsers or browser-like intermediate feeders and just one was an intermediate feeder. The records of these species in the Early Blancan of Guanajuato extend their geographic distribution from the southern USA to central Mexico.

A Pliocene record of Capromeryx (Mammalia: Antilocapridae) in México

2004 ◽  
Vol 78 (6) ◽  
pp. 1179-1186 ◽  
Author(s):  
E. Jiménez-Hidalgo ◽  
O. Carranza-Castañeda ◽  
M. Montellano-Ballesteros
Keyword(s):  
United States ◽  
North America ◽  
Geographic Distribution ◽  
Fossil Record ◽  
Central Mexico ◽  
Early Pliocene ◽  
Fluvial Deposits ◽  
Late Tertiary ◽  
San Miguel De Allende

The Antilocapridae was a diverse artiodactyl family present in some late Tertiary faunas of North America. In México, its Tertiary fossil record is poorly known. The antilocaprid material described in this paper was collected from the early Blancan fluvial deposits of the San Miguel de Allende Area, state of Guanajuato, México. It includes isolated upper and lower premolars and molars, dental series, and some rami fragments. The material is assigned to Capromeryx tauntonensis. The presence of this species in the early Pliocene of central México represents the oldest record in North America and extends its known geographic distribution from the northwestern United States to central México.

Early Paleozoic Hyolitha from North America: reexamination of Walcott's and Resser's type specimens

1988 ◽  
Vol 62 (2) ◽  
pp. 218-233 ◽  
Author(s):  
John Mark Malinky
Keyword(s):  
North America ◽  
Lower Cambrian ◽  
Type Species ◽  
New Genus ◽  
Early Paleozoic ◽  
Type Specimens ◽  
Middle Cambrian ◽  
Upper Cambrian ◽  
New Family ◽  
The Family

Concepts of the family Hyolithidae Nicholson fide Fisher and the genera Hyolithes Eichwald and Orthotheca Novak have been expanded through time to encompass a variety of morphologically dissimilar shells. The Hyolithidae is here considered to include only those hyolithid species which have a rounded (convex) dorsum; slopes on the dorsum are inflated, and the venter may be flat or slightly inflated. Hyolithes encompasses species which possess a low dorsum and a prominent longitudinal sulcus along each edge of the dorsum; the ligula is short and the apertural rim is flared. The emended concept of Orthotheca includes only those species of orthothecid hyoliths which have a subtriangular transverse outline and longitudinal lirae covering the shell on both dorsum and venter.Eighteen species of Hyolithes and one species of Orthotheca from the Appalachian region and Western Interior were reexamined in light of more modern taxonomic concepts and standards of quality for type material. Reexamination of type specimens of H. similis Walcott from the Lower Cambrian of Newfoundland, H. whitei Resser from the Lower Cambrian of Nevada, H. billingsi Walcott from the Lower Cambrian of Nevada, H. gallatinensis Resser from the Upper Cambrian of Wyoming, and H. partitus Resser from the Middle Cambrian of Alabama indicates that none of these species represents Hyolithes. Hyolithes similis is here included under the new genus Similotheca, in the new family Similothecidae. Hyolithes whitei is designated as the type species of the new genus Nevadotheca, to which H. billingsi may also belong. Hyolithes gallatinensis is referred to Burithes Missarzhevsky with question, and H. partitus may represent Joachimilites Marek. The type or types of H. attenuatus Walcott, H. cecrops Walcott, H. comptus Howell, H. cowanensis Resser, H. curticei Resser, H. idahoensis Resser, H. prolixus Resser, H. resseri Howell, H. shaleri Walcott, H. terranovicus Walcott, and H. wanneri Resser and Howell lack shells and/or other taxonomically important features such as a complete aperture, rendering the diagnoses of these species incomplete. Their names should only be used for the type specimens until better preserved topotypes become available for study. Morphology of the types of H.? corrugatus Walcott and “Orthotheca” sola Resser does not support placement in the Hyolitha; the affinities of these species are uncertain.

Review of Eohiodon (Teleostei: Osteoglossomorpha) from western North America, with a phylogenetic reassessment of Hiodontidae

1997 ◽  
Vol 71 (6) ◽  
pp. 1109-1124 ◽  
Author(s):  
Li Guo-Qing ◽  
Mark V. H. Wilson ◽  
Lance Grande
Keyword(s):  
North America ◽  
Sister Group ◽  
Sensu Stricto ◽  
Valid Species ◽  
Western North America ◽  
Extant Species ◽  
The Family ◽  
Fossil Records ◽  
Fossil Genus ◽  
Freshwater Teleosts

Review of recently collected material of Eohiodon from North America suggests that there are two valid species, E. rosei (Hussakof) and E. woodroffi Wilson. Eohiodon falcatus Grande is identical to E. woodruffi in known skeletal features and nearly all meristic features and is treated as a junior synonym of the latter. The fossil genus Eohiodon Cavender differs from Hiodon Lesueur, which is known from both fossil and extant species, in numerous meristic and osteological features. The caudal skeleton in Eohiodon is nearly identical to that in Hiodon.The traditionally accepted Notopteroidei, containing Lycopteridae, Hiodontidae, and Notopteridae, is a polypheletic group. The Asian fossil family Lycopteridae is not more closely related to Hiodontidae than it is to other taxa in the Osteoglossomorpha, but is sister to all other Osteoglossomorpha. The Hiodontiformes sensu stricto, including only the family Hiodontidae, is the sister-group of the Osteoglossiformes. This family is not more closely related to notopterids than to other taxa in Osteoglossiformes. The Notopteridae are most closely related to the Mormyroidea; together they and the fossil family Ostariostomidae constitute the sister-group of the Osteoglossoidei.Fossil records of Hiodontiformes sensu stricto and Notopteroidei indicate a widespread pre-Neogene biogeographic range of these freshwater teleosts, suggesting that extinction must have been involved in the Cenozoic evolution of these two osteoglossomorph sublineages.

Impact of the Coronavirus Disease 2019 Pandemic on Cardiac Surgical Education in North America

2021 ◽  
pp. 155698452110114
Author(s):  
Jessica G. Y. Luc ◽  
Tom C. Nguyen ◽  
Niv Ad
Keyword(s):  
Cardiac Surgery ◽  
North America ◽  
Geographic Distribution ◽  
Surgical Education ◽  
High Burden ◽  
Surgery Training ◽  
Virtual Institutions ◽  
Licensing Examination ◽  
The Impact ◽  
Adult Cardiac Surgery

Objective We report the impact of the coronavirus disease 2019 (COVID-19) pandemic on cardiac surgery trainee education in North America. Methods A survey was sent to participating academic adult cardiac surgery centers in North America. Data regarding the effect of COVID-19 on cardiac surgery training were analyzed. Results Responses were received from 53 academic institutions with diverse geographic distribution. Cardiac surgery trainee re-deployment to alternative clinical duties peaked at the height of the pandemic. We stratified institutions based on high ( n = 20) and low burden ( n = 33) of patients hospitalized with COVID-19. The majority of institutions have converted didactics (high burden 90% vs low burden 73%) and interviews for jobs/fellowships (high burden 75% vs low burden 73%) from in-person to virtual. Institutions were mixed in preference for administration of the licensing examination, with the most common preference for examinations to be held remotely on normal timeline (high burden 45% vs low burden 30%) or in person with more than 3-month delay (high burden 20% vs low burden 33%). Despite the challenges experienced during the COVID-19 pandemic on trainee clinical experience, re-deployment, and decreased operative volume, institutions expected their trainees to graduate on schedule (high burden 95% vs low burden 91%). Conclusions Our study demonstrates that actions taken during the COVID-19 pandemic has led to disruptions in cardiac surgery training with transition of didactics and interviews virtually and re-deployment to alternative duties. Despite this, institutions remain optimistic that their trainees will graduate on schedule.

scholarly journals A new species of sexually dimorphic Pareiorhaphis Miranda Ribeiro, 1918 (Siluriformes: Loricariidae) from the rio Doce basin, Brazil

2007 ◽  
Vol 5 (4) ◽  
pp. 443-448 ◽  
Author(s):  
Edson H. L. Pereira ◽  
Fábio Vieira ◽  
Roberto E. Reis
Keyword(s):  
New Species ◽  
Geographic Distribution ◽  
Minas Gerais ◽  
Sexually Dimorphic ◽  
The Family ◽  
A New Species

Pareiorhaphis nasuta, a new neoplecostomine catfish of the family Loricariidae is described. The species was collected from headwaters of the rio Matipó, tributary of the upper rio Doce basin in State of Minas Gerais, Brazil. The new species is readily diagnosed from all remaining congeners by the longer snout and by the smaller orbital diameter. The new species is the first representative of the genus Pareiorhaphis discovered in the rio Doce basin, thus expanding its geographic distribution. A phylogenetic diagnosis for Pareiorhaphis is presented.

The halloporid trepostome bryozoans from the Ordovician Simpson Group of Oklahoma

1991 ◽  
Vol 65 (2) ◽  
pp. 200-212 ◽  
Author(s):  
Marcus M. Key
Keyword(s):  
Discriminant Analysis ◽  
North America ◽  
Cladistic Analysis ◽  
Middle Ordovician ◽  
Bryozoan Species ◽  
The Family ◽  
Distinct Lineage

The Bromide Formation of the Middle Ordovician Simpson Group of Oklahoma contains one of the oldest diverse bryozoan faunas in North America. The early divergence of many trepostome clades is revealed in these rocks. Three trepostome bryozoan species belonging to family Halloporidae are described from this fauna. Discriminant analysis is used to define the following halloporid species: Diplotrypa schindeli n. sp., Tarphophragma karklinsi n. sp., and Tarphophragma macrostoma (Loeblich). Preliminary cladistic analysis indicates that the family Halloporidae was already a distinct lineage by the Middle Ordovician. This suggests that by this time, many of the major trepostome clades were already established.

scholarly journals The Fourth International Symposium on Ranaviruses: Summary of North American Herpetological Content and Points of Interest

2020 ◽  
pp. 29
Author(s):  
Lauren Ash ◽  
Rachel Marschang ◽  
Jolianne Rijks ◽  
Amanda Duffus
Keyword(s):  
North America ◽  
International Symposium ◽  
North American ◽  
Fourth International Symposium ◽  
Dna Viruses ◽  
The North ◽  
Double Stranded Dna ◽  
Points Of Interest ◽  
The Family ◽  
Globally Distributed

Ranaviruses are large double stranded DNA viruses from the family Iridoviridae. They are globally distributed and are currently known to affect fish, reptiles and amphibians. In North America, ranaviruses are also widely distributed, and cause frequent morbidity and mortality events in both wild and cultured populations. This is a synopsys of the North American content of the 4th International Symposium on Ranaviruses held in May 2017 in Budapest, Hungary.

scholarly journals The Egyptians in Sydney

2009 ◽  
Vol 2 (1) ◽  
Author(s):  
Stephanie Ho ◽  
Paul Ashton
Keyword(s):  
North America ◽  
Family Reunion ◽  
Highly Educated ◽  
The Family

Although Egyptians are generally known to be a non-migrating people closely tied to their land, the late 1950s and 1960s saw waves of Egyptians leaving their homeland for Europe, North America and Australia. Migration to Australia was limited prior to this period. In 1933, there were only 500 Egyptian-born people recorded as living in Australia. This number jumped to 8,000 in 1954 and 22,000 by 1966. Today there are around 34,000 Egyptian-born people in Australia and approximately 16,500 of them (nearly 50 per cent) live in Sydney.Around three-quarters of Egyptian migrants settled in Australia before 1976. However, there were substantial numbers of 'recent arrivals' (accounting for almost 15 per cent of this group) in 1986–91. Most of these later migrants came under the family reunion scheme. Generally the Egyptian community is a highly educated one, with qualification levels that exceed those of the average Australian. Today many Egyptian migrants living in Sydney belong to the professional and managerial classes.

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