Nadiastrophia from the Headless Formation (Eifelian), Mackenzie Mountains, District of Mackenzie, Northwest Territories

1973 ◽  
Vol 10 (9) ◽  
pp. 1460-1464 ◽  
Author(s):  
A. C. Lenz
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Middle Devonian ◽  
Southeastern Pacific ◽  
Mackenzie Mountains ◽  
A New Species

The genus Nadiastrophia previously recorded only from Australia and China, is described from the Headless Formation of the Mackenzie Mountains. This discovery further emphasizes the early Middle Devonian faunal affinities between the Cordilleran and southeastern Pacific regions. The Mackenzie Mountains Nadiastrophia is assigned to a new species, N. mackenziensis.

The otarionine trilobites Harpidella and Maurotarion, with species from northwestern Canada, the United States, and Australia

1995 ◽  
Vol 69 (2) ◽  
pp. 307-326 ◽  
Author(s):  
Jonathan M. Adrain ◽  
Brian D. E. Chatterton
Keyword(s):  
United States ◽  
New Species ◽  
Northwest Territories ◽  
Middle Devonian ◽  
The United States ◽  
Upper Ordovician ◽  
Mackenzie Mountains ◽  
New Diagnosis

Maurotarion Alberti, 1969, is a diverse otarionine clade that can be readily distinguished from Harpidella M'Coy, 1849. Both genera appear in the Upper Ordovician and range until the Middle Devonian. A new diagnosis for each taxon is given. New species of the genera from the Ordovician and Silurian of the central Mackenzie Mountains, Northwest Territories, Canada, include Harpidella kurrii (Ashgill), H. tikkaneni (Llandovery), H. greggi (Wenlock), and Maurotarion messieri (Llandovery). Harpidella megalops (M'Coy, 1846), H. triloba (Hu, 1975), H. spinafrons (Williams in Cooper and Williams, 1935), Maurotarion struszi (Chatterton, 1971), and M. instita (Whittington and Campbell, 1967) are revised.

Marine tube-dwelling diatoms of eastern Canada: descriptions, checklist, and illustrated key

1984 ◽  
Vol 62 (4) ◽  
pp. 778-794 ◽  
Author(s):  
Christopher S. Lobban
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Common Species ◽  
Bay Of Fundy ◽  
Eastern Canada ◽  
Lawrence Estuary ◽  
The Common ◽  
Living Material ◽  
St Lawrence Estuary ◽  
A New Species

From a study of living materials and specimens in several regional herbaria, a list has been drawn up of all the common and several of the rarer tube-dwelling diatoms of eastern Canada. Descriptions, illustrations of living material and acid-cleaned valves, and a key to the species are provided. Most specimens were from the Atlantic Provinces and the St. Lawrence estuary, but a few were from the Northwest Territories. By far the most common species is Berkeleya rutilans. Other species occurring commonly in the Quoddy Region of the Bay of Fundy, and sporadically in space and time elsewhere, arc Navicula delognei (two forms), Nav. pseudocomoides, Nav. smithii, Haslea crucigera, and a new species, Nav.rusticensis. Navicula ramosissima and Nav. mollis in eastern Canada are usually found as scattered cohabitants in tubes of other species. Nitzschia tubicola and Nz. fontifuga also occur sporadically as cohabitants.

Monelasmina besti, a new Schizophoriid Brachiopod from the Upper Devonian of Western Canada

1959 ◽  
Vol 96 (6) ◽  
pp. 470-472 ◽  
Author(s):  
A. E. H. Pedder
Keyword(s):  
New Species ◽  
Northwest Territories ◽  
Upper Devonian ◽  
Western Canada ◽  
A New Species

AbstractMonelasmina, previously known only from the Frasnian of Europe, is described and figured from the Hay River formation (Frasnian) of the Northwest Territories, Canada. The specimens are referred to a new species, M. besti.

Phylogenetic analysis of some Silurian rostroconchs (Mollusca) from northwestern Canada

1995 ◽  
Vol 32 (6) ◽  
pp. 806-827 ◽  
Author(s):  
Michael W. Caldwell ◽  
Brian D. E. Chatterton
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Sexual Dimorphism ◽  
Northwest Territories ◽  
Preliminary Analysis ◽  
New Genus ◽  
Data Sets ◽  
Familial Relationships ◽  
Mackenzie Mountains ◽  
Using Data

The new genus Avalanchia and the new species Avalanchia pterocarina, Cassowarioides anisomorpha, Cassowarioides polgari, Nehedia bergeraci, Nehedia restricta, and Nehedia tricarina are proposed from exceptionally preserved silicified faunas. Two new but unnamed rostroconch species are also described. These conocardioid rostroconchs were collected from Silurian deposits (late Llandovery to early Ludlow) near Avalanche Lake in the Mackenzie Mountains, Northwest Territories, Canada, and, when added to global rostroconch faunal lists, indicate a previously unrecognized diversity of Silurian conocardioid rostroconchs. The morphology of conocardioid rostroconchs is discussed, and a glossary of terms presented. Sexual dimorphism is recognized in species of Cassowarioides. Phylogenetic analysis of hippocardiids and bransoniids supports the monophyly of several genera. The hippocardiid genus Bigalea Pojeta and Runnegar, 1976, is recognized as paraphyletic and three species are assigned to a new genus, Redstonia. Preliminary analysis of bransoniids and hippocardiids for familial relationships, using data sets from the within-family analyses, indicates that the Bransoniidae is polyphyletic. The generic complex Mulceodens, considered to be derived bransoniid, is consistently reconstructed within a clade of derived hippocardiids.

A new species of Droharhynchia (Brachiopoda) from the lower Middle Devonian (Eifelian) of west-central Alaska

1994 ◽  
Vol 68 (6) ◽  
pp. 1235-1240 ◽  
Author(s):  
Mary E. Baxter ◽  
Robert B. Blodgett
Keyword(s):  
New Species ◽  
Middle Devonian ◽  
The Arctic ◽  
Geographic Proximity ◽  
Brooks Range ◽  
West Central ◽  
Arctic Alaska ◽  
Northern Alaska ◽  
A New Species

A new species of the genus Droharhynchia Sartenaer is established from lower Eifelian strata of west-central Alaska and the northwestern Brooks Range of Alaska. Droharhynchia rzhonsnitskayae n. sp. occurs in the Cheeneetnuk Limestone of the McGrath A-5 quadrangle, west-central Alaska, and the Baird Group of the Howard Pass B-5 quadrangle, northwestern Alaska. These occurrences extend the lower biostratigraphic range of both the genus and the subfamily Hadrorhynchiinae into the Eifelian. They also suggest close geographic proximity of the Farewell terrane of southwestern and west-central Alaska and the Arctic Alaska superterrane of northern Alaska during Devonian time.

Late Ordovician and Silurian lichid trilobites from northwestern Canada: Hemiarges, Borealarges, and Richterarges

2007 ◽  
Vol 81 (6) ◽  
pp. 1348-1364 ◽  
Author(s):  
Margaret J. Campbell ◽  
Brian D. E. Chatterton
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
Northwest Territories ◽  
Late Ordovician ◽  
The Arctic ◽  
Mackenzie Mountains ◽  
One New Species

Four new species of Borealarges, B. fritillus, B. patulus, B. renodis, and B. variabilis, and one new species of Richterarges, R. facetus, are described and one unnamed species, Borealarges sp., discussed. All are from the Wenlock strata of Avalanche Lake sections in the Mackenzie Mountains, Northwest Territories. Borealarges tuckerae Adrain, 1994, the only species reported from both the Arctic and the Mackenzie Mountains, is discussed. Hemiarges avalanchensis n. sp., an Ashgill species from Avalanche Lake section AV 4B just below the Ordovician-Silurian boundary, is described. A phylogenetic analysis based on 14 species of Borealarges, three of Richterarges, and two of Hemiarges, demonstrates that the former two genera are three separate and distinct taxa. Borealarges, a genus that includes some species formerly assigned to Richterarges or Hemiarges, is monophyletic, contains a well-supported internal clade of species, and is not separated into senso stricto and senso lato groupings.

Psychrolutes sio, a new psychrolutid fish (Scorpaeniformes) from the southeastern Pacific

1980 ◽  
Vol 58 (3) ◽  
pp. 443-449 ◽  
Author(s):  
Joseph S. Nelson
Keyword(s):  
New Species ◽  
Southern Hemisphere ◽  
Lateral Line ◽  
First Record ◽  
The Other ◽  
Body Color ◽  
Large Specimen ◽  
Future Studies ◽  
Southeastern Pacific ◽  
A New Species

Psychrolutes sio, a new species of Psychrolutidae from off northernmost Chile, is described from two specimens trawled at about 770–1150 m. The holotype is deposited in the Scripps Institution of Oceanography (SIO 72-184). The only large specimen, the 22.9-cm holotype, differs most conspicuously from the other two species of the genus Psychrolutes in having the head and body color a uniform brown, skin thin, lateral line pores in small but distinct tubes, and jaws equal. Psychrolutes sio represents the first record of the genus Psychrolutes to be recognized from the Southern Hemisphere. However, future studies may indicate that other southern psychrolutids of the genera Neophrynichthys and Cottunculoides should also be assigned to Psychrolutes.

scholarly journals Problematic Sclerites Eurytholia from the Lower and Middle Devonian of the Czech Republic

2019 ◽  
Vol 53 (1) ◽  
pp. 1-11
Author(s):  
Michal Mergl
Keyword(s):  
Czech Republic ◽  
New Species ◽  
Middle Devonian ◽  
Lower Devonian ◽  
Time Range ◽  
Formal Description ◽  
The Czech Republic ◽  
Barrandian Area ◽  
First Time ◽  
A New Species

AbstractProblematic phosphatic sclerites Eurytholia are reported for the first time from the Middle Devonian. Unequivocal sclerites were observed in limestones of Emsian to late Eifelian age in six localities of the Barrandian area of the Central Bohemia of the Czech Republic. Formerly observed size and shape variations of Eurytholia sclerites prevent formal description of a new species on few specimens of Emsian and Eifelian age. Therefore the new specimens are identified as Eurytholia aff. bohemica. Their presence indicates longer time range of the Eurytholia animal, covering not only the Ordovician, the Silurian and the earliest Devonian as known formerly, but also late Lower Devonian and the Middle Devonian. Similar features in morphology and histology of Eurytholia indicate relationship to a conodont Pseudooneotodus and a support suggestion about the vertebrate origin of Eurytholia sclerites.

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