scholarly journals A Review of North American Isoetes engelmannii (Isoetaceae) complex hybrids, including the description of I. × fernaldii, hyb. nov. and I. × karenae, hyb. nov.

Webbia ◽  
2020 ◽  
Vol 75 (1) ◽  
pp. 35-50 ◽  
Author(s):  
Daniel Francis Brunton ◽  
Paul Clayton Sokoloff
Keyword(s):  
North America ◽  
North American ◽  
Original Description ◽  
Eastern North America ◽  
Cytological Evidence ◽  
The World ◽  
In The Wild

The Isoetes engelmannii complex of eastern North America consists of 30 taxa including 13 named species. Nine of the 17 hybrids within the complex (the largest group of Isoetes hybrids in the world) have been formally described. Those named hybrids are reviewed here in light of recent additions to and enhancements of the morphological and cytological evidence employed in their original description. The pedigree of three of these, I. ×brittonii, I. ×bruntonii and I. ×carltaylorii, is updated and clarified. Formal descriptions are proposed for two additional taxa: I. ×fernaldii, hyb. nov. (I. engelmannii × I. hyemalis) and I. ×karenae, hyb. nov. (I. appalachiana × engelmannii). The potential for a further eight hybrid combinations to occur in the wild is also addressed.

Telephinaand Other Trilobites from the Pratt Ferry Beds, Ordovician of Alabama, U.S.A.

2014 ◽  
Vol 88 (3) ◽  
pp. 545-555 ◽  
Author(s):  
Frederick C. Shaw
Keyword(s):  
North America ◽  
North American ◽  
Original Description ◽  
Eastern North America ◽  
Zone Boundary ◽  
Middle Ordovician ◽  
Conodont Zone ◽  
Stratigraphic Range ◽  
Single Locality

The Pratt Ferry beds are a three meter thick bioclastic carbonate unit containing thePygodus serrus–P. anserinusconodont zone boundary and lying just below theNemagraptus gracilisgraptolite zone at a single locality in Alabama.TelephinaMarek at Pratt Ferry and other eastern North American localities is represented by at least six species. These are judged widespread and in part conspecific with Scandinavian or Asian forms of similar age. Most of the fifteen Appalachian telephinid species proposed by Ulrich (1930) are reviewed and some synonymized.BevanopsisCooper is present, extending its stratigraphic range viaB. buttsi(Cooper). The original description ofCeraurinella buttsiCooper is augmented. Other recorded but poorly represented genera includeAmpyxina,Arthrorhachis,Calyptaulax,Hibbertia,Lonchodomas,Mesotaphraspis,Porterfieldia, andSphaerexochus. The entire faunule represents a mixture of ‘inshore’ and ‘offshore’ or planktonic faunal elements rarely seen elsewhere in the latest Middle Ordovician (Darriwilian) of eastern North America.

New multituberculate mammal from the Early Cretaceous of eastern North America

2013 ◽  
Vol 50 (3) ◽  
pp. 315-323 ◽  
Author(s):  
Richard L. Cifelli ◽  
Cynthia L. Gordon ◽  
Thomas R. Lipka
Keyword(s):  
North America ◽  
Iberian Peninsula ◽  
Early Cretaceous ◽  
North American ◽  
Lower Cretaceous ◽  
Late Jurassic ◽  
Relative Length ◽  
Central Position ◽  
Eastern North America ◽  
The North

Multituberculates, though among the most commonly encountered mammalian fossils of the Mesozoic, are poorly known from the North American Early Cretaceous, with only one taxon named to date. Herein we describe Argillomys marylandensis, gen. et sp. nov., from the Early Cretaceous of Maryland, based on an isolated M2. Argillomys represents the second mammal known from the Arundel Clay facies of the Patuxent Formation (Lower Cretaceous: Aptian). Though distinctive in its combination of characters (e.g., enamel ornamentation consisting of ribs and grooves only, cusp formula 2:4, presence of distinct cusp on anterobuccal ridge, enlargement of second cusp on buccal row, central position of ultimate cusp in lingual row, great relative length), the broader affinities of Argillomys cannot be established because of non-representation of the antemolar dentition. Based on lack of apomorphies commonly seen among Cimolodonta (e.g., three or more cusps present in buccal row, fusion of cusps in lingual row, cusps strongly pyramidal and separated by narrow grooves), we provisionally regard Argillomys as a multituberculate of “plagiaulacidan” grade. Intriguingly, it is comparable in certain respects to some unnamed Paulchoffatiidae, a family otherwise known from the Late Jurassic – Early Cretaceous of the Iberian Peninsula.

scholarly journals World status of wild Rangifer tarandus populations

Rangifer ◽  
1986 ◽  
Vol 6 (2) ◽  
pp. 19 ◽  
Author(s):  
T. Mark Williams ◽  
Douglas C. Heard
Keyword(s):  
North America ◽  
North American ◽  
Aerial Photography ◽  
Rangifer Tarandus ◽  
Population Estimates ◽  
World Population ◽  
South Georgia ◽  
The World ◽  
Strip Transect

We recognized 184 herds of wild Rangifer tarandus, 102 in North America, 55 in Europe, 24 in Asia and 3 on South Georgia. Seventy-five percent of the world population of 3.3 to 3.9 million animals occurred in nine herds. All seven herds larger than 120 000 animals were censused by some means of aerial photography and all were increasing. Herds between 20 000 and 120 000 were most often censused using aerial strip transect methods, while total counts were usually employed to census smaller herds. The most pronounced changes in Rangifer herd status between 1979 and 1985 occurred in North America where population "estimates for five herds increased by a total of about one million animals. Part of this increase is attributable to a change from visual to photographic surveys. Eighty-three percent of North American, 88% of European, and 68% of Asian herds were stable or increasing.

The Natural Groups of Species in the Genus Ips De Geer (Coleoptera: Scolytidae) in North America

1963 ◽  
Vol 95 (5) ◽  
pp. 508-516 ◽  
Author(s):  
G. R. Hopping
Keyword(s):  
North America ◽  
North American ◽  
Related Species ◽  
North American Species ◽  
Closely Related Species ◽  
The North ◽  
The World ◽  
Group Relationships ◽  
Natural Groups

AbstractThe genus Ips is one of four closely related genera in the tribe Ipini, sub-tribe Ipina (De Geer 1775, Balachowsky 1949, Nunberg 1954, Hopping 1963). There are now 32 species of Ips recognized in North America, with a few more as yet undescribed. This paper defines the groups of closely related species with observations on the group relationships of species from other parts of the world. Work is in progress to define the North American species in each group.

scholarly journals Six new species and reports of Hydnum (Cantharellales) from eastern North America

MycoKeys ◽  
2018 ◽  
Vol 42 ◽  
pp. 35-72 ◽  
Author(s):  
Rachel A. Swenie ◽  
Timothy J. Baroni ◽  
P. Brandon Matheny
Keyword(s):  
North America ◽  
North American ◽  
Phylogenetic Analyses ◽  
Eastern North America ◽  
Phylogenetic Species ◽  
Additional Species ◽  
Taxonomic Descriptions ◽  
Molecular Phylogenetic ◽  
Herbarium Collections ◽  
Environmental Sequences

Five species of Hydnum have been generally recognized from eastern North America based on morphological recognition: H.albidum, H.albomagnum, H.repandum and varieties, H.rufescens, and H.umbilicatum. Other unique North American species, such as H.caespitosum and H.washingtonianum, are either illegitimately named or considered synonymous with European taxa. Here, seventeen phylogenetic species of Hydnum are detected from eastern North America based on a molecular phylogenetic survey of ITS sequences from herbarium collections and GenBank data, including environmental sequences. Based on current distribution results, sixteen of these species appear endemic to North America. Of these, six species are described as new: H.alboaurantiacum, H.cuspidatum, H.ferruginescens, H.subconnatum, H.subtilior, and H.vagabundum. Geographic range extensions and taxonomic notes are provided for five additional species recently described as new from eastern North America. A new name, H.geminum, is proposed for H.caespitosum Banning ex Peck, non Valenti. Overall, species of Hydnum are best recognized by a combination of morphological and molecular phylogenetic analyses. Taxonomic descriptions are provided for seventeen species, including epitype designations for H.albidum, H.albomagnum, and H.umbilicatum, taxa described more than 100 years ago, and molecular annotation of the isotype of H.washingtonianum. Photographs and a key to eastern North American Hydnum species are presented.

North American biogeography and taxonomy of Cryptolithus (Trilobita, Ordovician)

1994 ◽  
Vol 68 (4) ◽  
pp. 808-823 ◽  
Author(s):  
Frederick C. Shaw ◽  
Pierre J. Lespérance
Keyword(s):  
North America ◽  
North American ◽  
Type Species ◽  
Time Span ◽  
Eastern North America ◽  
Evolutionary Mechanisms ◽  
Variable Character

Museum and field restudy of Cryptolithus from all known geographic and stratigraphic occurrences in eastern North America shows that the principal variable character in this genus is the number of fringe pit arcs. Because this character varies within populations and even single individuals, it cannot be used to distinguish the earlier, typologically defined species of the genus. Instead, a neotype is designated here for the type species, Cryptolithus tessellatus Green, 1832, and morph designations are used for all pit arc variants. Over the time span considered, the species increased the number of pit arcs, but the ecological and evolutionary mechanisms responsible cannot be identified with certainty.

On the True Identity of Geophilus huronicus Meinert and the Presence of Geophilus longicornis Leach in North America (Chilopoda: Geophilomorpha: Geophilidae)

1951 ◽  
Vol 83 (11) ◽  
pp. 314-315
Author(s):  
Ralph E. Crabill
Keyword(s):  
North America ◽  
New England ◽  
North American ◽  
New World ◽  
Original Description ◽  
World Species

In 1886 Meinert described a new centipede from New England which he called Geophilus huronicus. This centipede, characterized at some length and with considerable accuracy in the original description. is peculiar in that it is rather unlike any other known North American member of the genus. Perhaps for that reason, as well as because he had never seen huronicus, Attems placed it in his long roster of questionable New World species.

A Portrait of North American Urban Historians

2018 ◽  
Vol 45 (6) ◽  
pp. 1237-1245
Author(s):  
Richard Harris
Keyword(s):  
North America ◽  
North American ◽  
Urban History ◽  
Frame Of Reference ◽  
Economic Effects ◽  
The World ◽  
Age Profile ◽  
Race Ethnicity

A survey of members of the Urban History Association (UHA) undertaken in March 2017 provides information about the character, views, and prospects of urban history in North America. Most UHA members are professional historians. Their age profile is balanced; women and minorities are underrepresented, though their age profile indicates that members will become more diverse. They are researching cities around the world, but focus mainly on the larger U.S. cities. Thematically, their main interests are in planning/design, race/ethnicity, politics, and housing, in that order. Most situate their work on U.S. cities within a national frame of reference; only half believe that there is something distinctively urban about cities. Those who do tend to highlight social, political, and cultural, as opposed to economic, effects. Their intellectual influences are primarily other urban historians rather than more theoretically oriented writers.

scholarly journals Intraspecific Variation in a Scorpionfly Newly Recorded from Texas and the State of Taxonomy of North American Panorpidae (Mecoptera)

2010 ◽  
Vol 2010 ◽  
pp. 1-5
Author(s):  
Joshua R. Jones
Keyword(s):  
North America ◽  
Intraspecific Variation ◽  
North American ◽  
Original Description ◽  
The State ◽  
Taxonomic Review ◽  
Intraspecific Variations ◽  
First Time

Panorpa vernalisByers is recorded for the first time from Texas, and represents only the second species ofPanorpadocumented from the state. Intraspecific variations between the Texas specimens and Byers' original description are discussed. A synopsis of the principal modern keys for identification of North AmericanPanorpais provided, and an argument for a modern taxonomic review of the Panorpidae of North America is presented.

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