Carpocrinus (Echinodermata: Crinoidea) from the Late Silurian of Somerset Island, Northwest Territories, Canada

1977 ◽  
Vol 14 (1) ◽  
pp. 132-136 ◽  
Author(s):  
T. J. Frest ◽  
H. L. Strimple
Keyword(s):  
North America ◽  
Northwest Territories ◽  
North American ◽  
Arctic Canada ◽  
Separate Genus ◽  
Somerset Island

Carpocrinus arcticus n. sp. is the first Silurian crinoid to be reported from Arctic Canada (Read Bay Formation, Somerset Island). The species is distinguished from other North American Carpocrinus by its nonlobate calyx, plates with impressed sutures, and granular plate ornamentation. It is a member of a largely European lineage not previously reported from North America. The typical North American lineage was considered a separate genus (Stiptocrinus) by Kirk: it is here considered synonymous with Carpocrinus. Review of the stratigraphic distribution of Carpocrinus occurrences indicates that the lineage including C. arcticus is characteristic of Late Wenlock-Ludlow rocks.

A Fossil Specimen of the North American Hickory Aphid (Longistigma caryae Harris), Found in Tertiary Deposits in Iceland

1971 ◽  
Vol 2 (1) ◽  
pp. 74-80 ◽  
Author(s):  
Walter L. Friedrich ◽  
Ole E. Heie
Keyword(s):  
North America ◽  
North American ◽  
Endemic Species ◽  
Deciduous Forests ◽  
Deciduous Trees ◽  
Arctic Canada ◽  
Upper Miocene ◽  
The North ◽  
Fossil Specimen ◽  
Eastern Deciduous Forests

AbstractA fossil specimen of Longistigma caryae (Harris) has been found in tuff from Iceland, locality: Hrútagíl i Mókollsdal in northwestern Iceland, age: Upper Miocene or Lower Pliocene. In the present time the species lives exclusively in the region of the Eastern Deciduous Forests of North America on several genera of deciduous trees, a.o. Carya and Fagus. The find certifies paleobotanical evidence indicating that Iceland once belonged in the region of deciduous forests with a flora more like the modern eastern North American flora than any other modern flora region. The recent aphid fauna of Iceland contains only palaearctic, holarctic, cosmopolitic, and endemic species and species common with Greenland and arctic Canada.

Anastrophyllum assimile and Marsupella revoluta, new to the interior of North America

1977 ◽  
Vol 55 (19) ◽  
pp. 2479-2484 ◽  
Author(s):  
Diana G. Horton
Keyword(s):  
British Columbia ◽  
North America ◽  
Northwest Territories ◽  
North American ◽  
Yukon Territory ◽  
The Arctic ◽  
Devon Island ◽  
New Localities ◽  
Central Eastern ◽  
Coastal British Columbia

Anastrophyllum assimile (Mitt.) Steph. and Marsupella revoluta (Nees) Lindb. are reported from the Keele Peak area, central-eastern Yukon Territory, Canada, and M. revoluta is also reported from Devon Island, Northwest Territories, Canada. These new localities extend a pattern of disjunct occurrences throughout the known range of both species, which further support the hypothesis of their relictual status. However, collections of A. assimile from coastal British Columbia and the Alexander Archipelago, Alaska, are indicative of strong oceanic affinities of North American populations of this species. Also, the arctic and alpine localities at which either A. assimile or M. revoluta might be expected to occur in the interior of Alaska and the Yukon are limited in number as both species invariably occur in association with siliceous substrates.

NEWLY RECOGNIZED HOLARCTIC AND INTRODUCED PLANT BUGS IN NORTH AMERICA (HETEROPTERA: MIRIDAE)

1998 ◽  
Vol 130 (3) ◽  
pp. 267-283 ◽  
Author(s):  
Michael D. Schwartz ◽  
G.G.E. Scudder
Keyword(s):  
British Columbia ◽  
North America ◽  
Northwest Territories ◽  
North American ◽  
Washington State ◽  
Yukon Territory ◽  
Lygus Rugulipennis

AbstractThe first North American records forDeraeocoris punctulatus(Fallén),Labopidea artemisiae(Sahlberg), andLabopidea bermaniKerzhner indicate that the species are naturally Holarctic.Lygus rugulipennisPoppius is now considered naturally Holarctic after specimens ofLygus perplexusStanger from Alaska, Yukon Territory, and Northwest Territories are correctly identified asL.rugulipennis. Additional North American localities forLabopidea discolor(Sahlberg) support the contention that the species is naturally Holarctic. Collections ofOrthotylus ochrotrichusFieber from Royal Oak, British Columbia, andMalacocoris chlorizansPanzer from British Columbia and Washington state suggest that these species are adventive to North America. Diagnoses are provided to distinguish all the taxa from other North American congeners. A key to the northern Nearctic species ofLabopideais given.

A Lower Cambrian Eotebenna (Mollusca) from Arctic North America

1989 ◽  
Vol 26 (7) ◽  
pp. 1501-1503 ◽  
Author(s):  
John S. Peel
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
Lower Cambrian ◽  
Arctic Canada ◽  
Middle Cambrian ◽  
A New Species ◽  
North Greenland

The helcionellacean mollusc Eotebenna Runnegar and Jell, 1976 is described from the Lower Cambrian Henson Gletscher Formation of central North Greenland, part of the Franklinian Basin sequence of Arctic Canada and adjacent northern Greenland. The Henson Gletscher Formation specimens of Eotebenna are the first Lower Cambrian and North American records of a genus originally described from the Middle Cambrian of Australia. A new species, Eotebenna arctica, is described.

State of the Art Review–Water Distribution and Sewage Collection in Northern North America

1983 ◽  
Vol 15 (S2) ◽  
pp. 55-64
Author(s):  
F W James
Keyword(s):  
North America ◽  
Northwest Territories ◽  
North American ◽  
Water Distribution ◽  
State Of The Art ◽  
Development Work ◽  
The North ◽  
Future System ◽  
System Designs ◽  
Planning Approaches

Reviews development of various methods of water distribution and sewage collection in the North American North and the particular problems facing engineers in carrying out such development work. Examples of various communities and current construction designs and techniques are given. Special emphasis is placed in a shallow buried piped system developed by the author in the Northwest Territories. A brief outlook at the direction of future system designs and planning approaches is given.

Marionina charae, a new species of enchytraeid (Oligochaeta) from the Canadian arctic

1970 ◽  
Vol 48 (6) ◽  
pp. 1359-1361 ◽  
Author(s):  
Michael J. Tynen
Keyword(s):  
New Species ◽  
North America ◽  
Northwest Territories ◽  
North American ◽  
Canadian Arctic ◽  
The North ◽  
North American Arctic ◽  
A New Species

Marionina charae n. sp. was collected from a stream flowing out of Char Lake, Comwallis Island, in the Northwest Territories of Canada. Thirteen species of Marionina have now been described from North America, and seven species of enchytraeid have been found in the North American arctic.

Nucleotide polymorphisms in three genes support host and geographic speciation in tree pathogens belonging toGremmeniellaspp.

2002 ◽  
Vol 80 (11) ◽  
pp. 1151-1159 ◽  
Author(s):  
M Dusabenyagasani ◽  
G Laflamme ◽  
R C Hamelin
Keyword(s):  
North America ◽  
Dna Sequences ◽  
North American ◽  
Abies Balsamea ◽  
Host Specialization ◽  
Rrna Genes ◽  
Nucleotide Polymorphisms ◽  
Group I ◽  
Geographic Separation ◽  
Pinus Spp

We detected nucleotide polymorphisms within the genus Gremmeniella in DNA sequences of β-tubulin, glyceraldehyde phosphate dehydrogenase, and mitochondrial small subunit rRNA (mtSSU rRNA) genes. A group-I intron was present in strains originating from fir (Abies spp.) in the mtSSU rRNA locus. This intron in the mtSSU rRNA locus of strains isolated from Abies sachalinensis (Fridr. Schmidt) M.T. Mast in Asia was also found in strains isolated from Abies balsamea (L.) Mill. in North America. Phylogenetic analyses yielded trees that grouped strains by host of origin with strong branch support. Asian strains of Gremmeniella abietina (Lagerberg) Morelet var. abietina isolated from fir (A. sachalinensis) were more closely related to G. abietina var. balsamea from North America, which is found on spruce (Picea spp.) and balsam fir, and European and North American races of G. abietina var. abietina from pines (Pinus spp.) were distantly related. Likewise, North American isolates of Gremmeniella laricina (Ettinger) O. Petrini, L.E. Petrini, G. Laflamme, & G.B. Ouellette, a pathogen of larch, was more closely related to G. laricina from Europe than to G. abietina var. abietina from North America. These data suggest that host specialization might have been the leading evolutionary force shaping Gremmeniella spp., with geographic separation acting as a secondary factor.Key words: Gremmeniella, geographic separation, host specialization, mitochondrial rRNA, nuclear genes.

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