Holmograptus spinosus and the Middle Ordovician (Darriwilian) graptolite biostratigraphy at Les Méchins (Quebec, Canada)

2009 ◽  
Vol 46 (10) ◽  
pp. 739-755 ◽  
Author(s):  
Jörg Maletz
Keyword(s):  
North America ◽  
Eastern North America ◽  
Middle Ordovician ◽  
Rare Combination ◽  
Conodont Biofacies ◽  
Sponge Spicules ◽  
First Time

The Les Méchins region in Quebec provides a unique opportunity to understand the Darriwilian graptolite succession in eastern North America. The graptolite faunas of the upper member of the Anse au Crapaud Formation include the Arienigraptus gracilis , Oncograptus upsilon , Undulograptus austrodentatus , and Holmograptus spinosus biozone faunas and, thus, complement the well known Darriwilian faunas of the Cow Head, Table Head, and Goose Tickle groups of western Newfoundland. In particular, the Holmograptus spinosus Biozone interval of calcarenitic limestones bears a rare combination of benthic (shelly) and planktic (graptolitic) faunas with conodonts, brachiopods, ostracods, sponge spicules, and algal remains associated with common graptolites that allow an inter-continental correlation. The Holmograptus spinosus Biozone is introduced for the interval based on a diverse and characteristic graptolite fauna. The fauna includes among others, Atopograptus woodwardi , recognized for the first time in North America. The Holmograptus spinosus Biozone fauna can be found worldwide and is easily correlated into the conodont biofacies using species of the genus Histiodella . Ties between graptolite and conodont biozonations are discussed for the Darriwilian. Silicified ostracods are illustrated for the first time from the interval. Hustedograptus quebecensis is described as new.

Lower and Middle Ordovician Lithistid Demosponges from the Mingan Islands, Gulf of St. Lawrence, Quebec, Canada

1995 ◽  
Vol 69 (S41) ◽  
pp. 1-35 ◽  
Author(s):  
J. Keith Rigby ◽  
Andre Desrochers
Keyword(s):  
New Species ◽  
North America ◽  
Type Material ◽  
Eastern North America ◽  
Type Specimens ◽  
Middle Ordovician ◽  
First Time ◽  
Original Type

New collections, as well as original type material, of Lower and Middle Ordovician sponges from the Mingan Island Archipelago are described and figured from the Mingan and Romaine Formations. Archaeoscyphia minganensis (Billings, 1859), Hudsonospongia minganensis Raymond and Okulitch, 1940, H. irregularis Raymond and Okulitch, 1940, H. duplicata Raymond and Okulitch, 1940, Zittelella varians (Billings, 1861a), and Eospongia roemeri Billings, 1861, are redescribed from original type specimens and new collections. The species Archaeoscyphia pulchra (Bassler, 1927), Rhopalocoelia clarkii Raymond and Okulitch, 1940, Psarodictyum magnificum Raymond and Okulitch, 1940, and Lissocoelia ramosa Bassler, 1927 are reported and described from the Mingan Islands for the first time. To these sponges are added the new species Anthaspidella amplia, Archaeoscyphia undulata, Hudsonospongia nodosa, and Zittelella grossa, which are described from type specimens from the Mingan Formation.The assemblage from 12 localities from the Mingan Formation, and one from the Romaine Formation, represents one of the most diverse demosponge faunas from eastern North America. Sponges in most of the localities accumulated as transported debris or lag gravels, but locally, some grew in small reefoidal mounds and also accumulated as adjacent debris.

Ordovician (Whiterockian) gastropods of Nevada: Bellerophontoidea, Macluritoidea, and Euomphaloidea

1994 ◽  
Vol 68 (3) ◽  
pp. 473-486 ◽  
Author(s):  
David M. Rohr
Keyword(s):  
North America ◽  
Significant Role ◽  
New Genus ◽  
Eastern North America ◽  
New Genus And Species ◽  
Middle Ordovician

Gastropods are abundant in the Middle Ordovician (Whiterockian) Antelope Valley Formation of Nevada. Because Whiterockian rocks are absent in much of central and eastern North America, these Nevada gastropods play a significant role in understanding the Early to Middle Ordovician transition of the class. The shell and operculum of a new genus and species of macluritoid, Monitorella auricula, is described. New euomphaloid taxa include Walcottoma frydai n. gen. and sp., Rossospira harrisae n. gen. and sp., Barnesella measuresae n. sp., Helicotoma gubanovi n. sp., Lytospira yochelsoni n. sp., and Malayaspira hintzei n. sp.

Ptiliidae of the Maritime Provinces of Canada (Coleoptera): new records and bionomic notes

Zootaxa ◽  
2007 ◽  
Vol 1423 (1) ◽  
pp. 27-38 ◽  
Author(s):  
CHRISTOPHER G. MAJKA ◽  
MIKAEL SÖRENSSON
Keyword(s):  
North America ◽  
Prince Edward Island ◽  
New Records ◽  
Eastern North America ◽  
Maritime Provinces ◽  
The Family ◽  
Saproxylic Species ◽  
Undisturbed Forest ◽  
First Time ◽  
Forest Conditions

The Ptiliidae of the Maritime Provinces of Canada is surveyed. Twenty-nine new provincial records from the Maritime Provinces of Canada are reported including the first records of the family from Prince Edward Island. Fourteen species are recorded for the first time for the Maritime Provinces as a whole. Acrotrichis josephi (Matthews) is recorded for the first time in eastern North America and Acrotrichis haldemani (LeConte) is recorded for the first time in Canada. The genus Pteryx is reported for the first time in Canada. At least 29 species of Ptiliidae are now known to occur in the region. The fauna is briefly discussed in terms of its overall composition, introduced species, and species associated with particular habitats. Saproxylic species found in mature forests are discussed and attention is drawn to their possible relationship to undisturbed forest conditions and the scarcity of old-growth habitats in the region.

An endemic groundwater fauna in unglaciated eastern North America

1995 ◽  
Vol 73 (3) ◽  
pp. 502-508 ◽  
Author(s):  
David L. Strayer ◽  
Sarah E. May ◽  
Pamela Nielsen ◽  
Wilfried Wollheim ◽  
Sharon Hausam
Keyword(s):  
North America ◽  
Eastern North America ◽  
Invertebrate Fauna ◽  
Groundwater Fauna ◽  
First Time ◽  
Rich Fauna

Invertebrates specialized for life in groundwater (stygobionts) are diverse and widely distributed in Europe but poorly known in North America. A survey of the invertebrate fauna at 14 sites in eastern North America shows that unglaciated ancient terrain in eastern North America contains a rich fauna of stygobionts. Several groups of stygobionts (the polychaete Troglochaetus sp., an undescribed genus of aphanoneuran annelid, a possibly undescribed family of oligochaetes, bathynellacean crustaceans, and microcerberid isopods) are reported for the first time from eastern North America. Stygobionts are infrequent north of the glacial border, suggesting that they have not yet been able to disperse into glaciated terrain. The extraordinarily slow dispersal rates implied by these distributions have important ecological ramifications. The few stygobionts found north of the glacial border may have survived glaciation in subglacial refugia.

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.

Middle Ordovician actinocerid nautiloids (Cephalopoda) from Xainza County, Tibet, western China, and their paleogeographic implications

2018 ◽  
Vol 92 (3) ◽  
pp. 398-411 ◽  
Author(s):  
Xiang Fang ◽  
Tingen Chen ◽  
Clive Burrett ◽  
Yongsheng Wang ◽  
Yonggui Qu ◽  
...  
Keyword(s):  
Cluster Analysis ◽  
New Species ◽  
North America ◽  
South China ◽  
North China ◽  
Western China ◽  
Middle Ordovician ◽  
Lhasa Terrane ◽  
First Time ◽  
The Himalaya

AbstractActinocerid nautiloids from the Lhasai Formation in the Xainza region are studied systematically for the first time. The nautiloids are identified as Middle Ordovician in age based on stratigraphic correlations with those from North China, Sibumasu, North Australia (northern Gondwana), and North America (Laurentia). A cluster analysis shows strong affinities between the actinocerid nautiloids of the Lhasa Terrane and those of the Himalaya, North China, and Sibumasu terranes. Our results support Middle Ordovician paleogeographic reconstructions that place North China rather than South China much closer to Australia. Nine species assigned to six genera of Meitanoceratidae, Wutinoceratidae, Armenoceratidae, Ormoceratidae, and Discoactinoceratidae are described in detail:Pomphoceras nyalamense(Chen, 1975),Pomphoceras yaliense(Chen, 1975),Wutinocerascf.W.foerstei(Endo, 1930),Mesowutinoceras giganteumChen in Chen and Zou, 1984,Armenoceras tani(Grabau, 1922),Armenoceras teichertiEndo, 1932,Armenoceras xizangensenew species,Deiroceras globosomZou and Shen in Chen and Zou, 1984, andDiscoactinocerascf.D.multiplexumKobayashi, 1927.UUID:http://zoobank.org/ba851fea-e107-4754-a0f4-a70744e325ab

Trilobites from the base of the type Whiterockian (Middle Ordovician) in Nevada

1999 ◽  
Vol 73 (2) ◽  
pp. 182-201 ◽  
Author(s):  
Richard A. Fortey ◽  
Mary L. Droser
Keyword(s):  
New Species ◽  
North America ◽  
Turning Point ◽  
Abrupt Change ◽  
Major Change ◽  
Species Level ◽  
Western North America ◽  
Middle Ordovician ◽  
First Time ◽  
Open Shelf

No trilobite species, and very few genera, pass from the Lower (Ibexian) into the Middle Ordovician (Whiterockian), which is a turning point in Laurentian trilobite history. Trilobites from three sections exposing the base of the Whiterock Series (basal Middle Ordovician) in Nevada are described and illustrated. They are attributable to different, and generally more open-shelf, biofacies from the Bathyurid biofacies trilobites described from the Ibex area, Utah, by Fortey and Droser (1996), but include species in common, which allow correlation into the Ibexian type section. At Little Rawhide Mountain the basal Middle Ordovician is developed in Olenid biofacies, described for the first time in western North America from rocks of this age. Correlation based on species-level similarity shows that the “spike” that has been used to define the type base of the Whiterockian (and hence the Middle Ordovician) at Whiterock Canyon is at a level younger than the base of the Whiterockian assumed in recent discussions of its international correlation. The type Whiterock base correlates with the Psephosthenaspis glabrior trilobite Subzone at Ibex, well above the major change in trilobite faunas at the base of the Psephosthenaspis Zone (P. microspinosa Subzone). In all study sections there is an abrupt change of facies after trilobite Zone J, possibly associated with regression. Four new species are described: Cloacaspis tesselata, Harpillaenus rossi, Acidiphorus? lineotuberculatus, and Benthamaspis serus.

Trametes gibbosa (Basidiomycetes, Polyporales) in the USA and Canada

2007 ◽  
Vol 85 (3) ◽  
pp. 342-346 ◽  
Author(s):  
J. Kout ◽  
J. Vlasák
Keyword(s):  
United States ◽  
Czech Republic ◽  
North America ◽  
Mating Type ◽  
North American ◽  
Eastern North America ◽  
The Czech Republic ◽  
The North ◽  
The Usa ◽  
First Time

The polypore Trametes gibbosa (Pers.) Fries, common in Europe and Asia, is reported from eastern North America for the first time. Single basidiospore cultures from Pennsylvania, United States, and Quebec, Canada, were paired with each other and with cultures from the Czech Republic. The North American intercollection crosses were 60% compatible and 100% compatible with the Czech cultures. All the crosses among the Czech cultures were 100% compatible. The recent introduction of T. gibbosa to North America is suggested as a possible explanation for the limited number of mating-type alleles and subsequent incompatibility among the North American cultures.

scholarly journals Statistical Analysis of Paradigmatic Class Richness Supports Greater Paleoindian Projectile-Point Diversity in the Southeast

2016 ◽  
Vol 81 (1) ◽  
pp. 174-192 ◽  
Author(s):  
Metin I. Eren ◽  
Anne Chao ◽  
Chun-Huo Chiu ◽  
Robert K. Colwell ◽  
Briggs Buchanan ◽  
...  
Keyword(s):  
North America ◽  
Atlantic Coastal Plain ◽  
Eastern North America ◽  
Projectile Point ◽  
Tennessee River ◽  
The 1960S ◽  
River Valleys ◽  
First Time ◽  
Atlantic Coastal ◽  
Point Class

AbstractRonald Mason’s hypothesis from the 1960s that the southeastern United States possesses greater Paleoindian projectile-point diversity than other regions is regularly cited, and often assumed to be true, but in fact has never been quantitatively tested. Even if valid, however, the evolutionary meaning of this diversity is contested. Point diversity is often linked to Clovis “origins,” but point diversity could also arise from group fissioning and drift, admixture, adaptation, or multiple founding events, among other possibilities. Before archaeologists can even begin to discuss these scenarios, it is paramount to ensure that what we think we know is representative of reality. To this end, we tested Mason’s hypothesis for the first time, using a sample of 1,056 Paleoindian points from eastern North America arui employing paradigmatic classification and rigorous statistical tools used in the quantification of ecological biodiversity. Our first set of analyses, which compared the Southeast to the Northeast, showed that the Southeast did indeed possess significantly greater point-class richness. Although this result was consistent with Mason’s hypothesis, our second set of analyses, which compared the Upper Southeast to the Lower Southeast and the Northeast showed that in terms of point-class richness the Upper Southeast > Lower Southeast > Northeast. Given current chronometrie evidence, we suggest that this latter result is consistent with the suggestion that the area of the Ohio, Cumberland, and Tennessee River valleys, as well as the mid-Atlantic coastal plain, were possible initial and secondary “staging areas” for colonizing Paleoindian foragers moving from western to eastern North America.

Sign in / Sign up

Export Citation Format

Share Document