Ordovician Sphinctozoan Sponges from the Eastern Klamath Mountains, Northern California

1986 ◽  
Vol 60 (S20) ◽  
pp. 1-47 ◽  
Author(s):  
J. Keith Rigby ◽  
A. W. Potter
Keyword(s):  
New Species ◽  
North America ◽  
Growth Form ◽  
Late Ordovician ◽  
Late Paleozoic ◽  
Late Devonian ◽  
Northern California ◽  
New Genera ◽  
Klamath Mountains ◽  
Middle Ordovician

Extensive silicified faunules of Middle and Late Ordovician sphinctozoan sponges have been assembled from the northern part of the eastern Klamath Mountains in northern California. The sponges are from eugeosynclinal rocks that are the westernmost Middle Ordovician to Late Devonian rocks at that latitude in North America. Seventeen new species occur in the assemblages, including 10 porate and 7 aporate forms. New genera of porate forms areAmblysiphonelloidesandCorymbospongia, and new porate species include:Amblysiphonella grossa, Amblysiphonelloides tubula, A. reticulata, Imperatoria mega, I. media, I. minima, I. irregularis, Corymbospongia adnata, C. mica, andC.(?)perforata.These are the first reported occurrences ofAmblysiphonellaandImperatoriain the Ordovician. New aporate genera areCystothalamiellaandPorefieldia, and new aporate species include:Cystothalamiella ducta, C. craticula, C. tuboides, Porefieldia robusta, Girtyocoelia epiporata, andG. canna.This is the oldest known occurrence ofGirtyocoelia, which is generally considered a Late Paleozoic form.Cliefdenella obconican. sp. is characterized by an obconical growth form in contrast to other species of the genus that are more massive or explanate.Cliefdenellais considered here as an imperforate sphinctozoan.Minor isolated hexactines and hexactine-derived spicules of Hexactinellida were associated with the sphinctozoans. No particular taxa within the class can be distinguished from these individual elements.

Flexible crinoids from the Upper Ordovician Maquoketa Formation of the northern midcontinent and the evolution of early flexible crinoids

2001 ◽  
Vol 75 (2) ◽  
pp. 370-382 ◽  
Author(s):  
James C. Brower
Keyword(s):  
New Species ◽  
North America ◽  
Late Ordovician ◽  
Upper Ordovician ◽  
Middle Ordovician

Three flexible crinoids occur in the Upper Ordovician Maquoketa Formation of Illinois, Iowa, and Minnesota:Protaxocrinus girvanensisRamsbottom, 1961,Clidochirus anebosnew species, andProanisocrinus oswegoensis(Miller and Gurley, 1894).Protaxocrinus girvanensisis also found in the Upper Ordovician of Scotland which indicates that the ocean was narrow enough to allow at least one crinoid species to cross the barrier. The Upper Ordovician of North America and Scotland also share many common crinoid genera. Both phenetic and cladistic methods result in similar phylogenies of flexible crinoids.Protaxocrinuswas derived from a cupulocrinid ancestor during the Middle Ordovician.Clidochirusevolved fromProtaxocrinusor its ancestral stock prior to the Richmondian of the Late Ordovician. The RichmondianProanisocrinusand later anisocrinids are most closely related toClidochirusor its immediate predecessor. Thus, three major lineages of flexible crinoids,Protaxocrinus(taxocrinid group),Clidochirus(icthyocrinid), andProanisocrinus(anisocrinids and homalocrinids), appeared during the Ordovician. Despite their rarity during the Ordovician, all three flexible lineages survived the Latest Ordovician extinction, whereas their more abundant and successful cupulocrinid ancestors were eliminated.

The Ordovician brachiopod genus Bimuria from the eastern Klamath Mountains, northern California

1990 ◽  
Vol 64 (2) ◽  
pp. 200-213 ◽  
Author(s):  
A. W. Potter
Keyword(s):  
Northern Ireland ◽  
Late Ordovician ◽  
Yukon Territory ◽  
Preliminary Survey ◽  
Northern California ◽  
Klamath Mountains ◽  
The West ◽  
East Central ◽  
Middle Ordovician ◽  
Southwestern Siberia

The genus Bimuria Ulrich and Cooper, 1942, is a biogeographically important member of middle and late Ordovician brachiopod faunas of the Callahan–Gazelle area in the eastern Klamath Mountains of northern California. In middle Ordovician deposits the genus is widespread and ranges from Nevada in the west to southwestern Siberia in the east; however, in late Ordovician beds it was previously known only in Sweden and Northern Ireland. In addition to the northern California occurrence reported here, new late Ordovician occurrences are also noted in east-central Alaska–Yukon Territory and Northwest Territories. Three species of Bimuria are described, including the new species, B. californiensis.A preliminary survey of species described in the literature suggests that the ratio of the length of the dorsal adductor field to the length of the elongate area in the brachial valve decreases from middle to late Ordovician species, and thus may be of biostratigraphic value.

scholarly journals Late Ordovician Palynomorphs

1985 ◽  
Vol 4 (1) ◽  
pp. 11-26 ◽  
Author(s):  
S. G. Molyneux ◽  
F. Paris
Keyword(s):  
New Species ◽  
North America ◽  
Late Ordovician ◽  
Middle Ordovician ◽  
Early Ordovician ◽  
Core Samples ◽  
Type Section ◽  
A New Species

Abstract. ACRITARCHSOrdovician acritarchs have been recorded in five core samples collected between 2520 ft. and 3000 ft. in Well E1-81, and ten cutting samples taken between 12150 ft. and 13240 ft. in Well J1-81A. All the assemblages recovered are of Late Ordovician age; no Early Ordovician or Middle Ordovician assemblages have been identified.Investigations have so far concentrated on the acritarch assemblages from Well El-81. The highest three Ordovician samples from depths of 2520 to 2550 ft., 2552 to 2557 ft., and 2562 to 2567 ft., yielded similar assemblages which include Veryhachium irroratum, V. cf. lairdii, V. oklahomense?, V. subglobosum, V. trispinosum, Villosacapsula setosapellicula and a new species, Striatotheca sp. A. Navifusa similis? is represented by one specimen in the sample from 2552 to 2557 ft. Another specimen from the same sample is tentatively referred to Aremoricanium syringosagis. Specimens of Baltisphaeridium, Peteinosphaeridium, Leiofusa and Eupoikilofusa occur throughout the interval 2520 to 2567 ft. but are rare. Commonly occurring species include V. irroratum and V. setosapellicula. V. irroratum has been recorded from the Middle Ordovician of North America (Loeblich & Tappan, 1969) and the Caradoc of England (Turner, 1984) but Cramer & Diez (1979) maintain that it has its acme in the Ashgill. V. setosapellicula is common in the Sylvan Shale of Oklahoma (Loeblich, 1970) which is generally understood to be of Ashgill age, but is rare in the Eden Shale (Caradoc) of Indiana (Colbath, 1979) and in the type section of the Caradoc Series in Shropshire, England (Turner, 1984). . . .

I.—Trilobites from the confinis Flags (Ordovician) of the Girvan District, Ayrshire.

1962 ◽  
Vol 65 (1) ◽  
pp. 1-40 ◽  
Author(s):  
Ronald Pearson Tripp
Keyword(s):  
New Species ◽  
North America ◽  
New Genera ◽  
Middle Ordovician ◽  
Close Resemblance

SynopsisThree new genera and seventeen new species of trilobites from the Flags with Valcourea confinis (Salter) of the Girvan District are described and named, and thirty-six species are figured. The genera constitute a normal Middle Ordovician assemblage for the Girvan District; none of the species is known elsewhere. There is a close resemblance to the fauna of the Lower Edinburg Formation of the Appalachian Valley of the U.S.A., and many of the generic stocks are known earlier only from the Chazy and Lincolnshire Formations of North America.

Late Ordovician rugose corals of the northern Sierra Nevada, California

1994 ◽  
Vol 68 (1) ◽  
pp. 164-168 ◽  
Author(s):  
Robert J. Elias ◽  
A. W. Potter ◽  
Rodney Watkins
Keyword(s):  
Sierra Nevada ◽  
Late Ordovician ◽  
Late Devonian ◽  
Northern California ◽  
Rugose Corals

The shoo fly Complex of Late Devonian and older Paleozoic age is a regionally extensive rock assemblage in the northern Sierra Nevada of northern California. It consists chiefly of a coherent unit of phyllite, quartzose sandstone, and chert, and a melange unit (Hannah and Moores, 1986). Several limestone lenses in the Taylorsville area comprise the Montgomery Limestone (Diller, 1892, 1908; McMath, 1958; Figure 1). The Montgomery was long considered to be Silurian, largely on the basis of corals, brachiopods, and cephalopods (Diller, 1892, 1908; McMath, 1958; Berry and Boucot, 1970; Merriam, 1972). However, recent analyses of the biota indicate an Ashgill (middle Maysvillian–Gamachian) age (Boucot and Potter, 1977; Harris, personal commun. cited in Hannah and Moores, 1986, p. 790; Potter et al., 1990b; present study).

Nucularcidae: a new family of palaeotaxodont Ordovician pelecypods (Mollusca) from North America and Australia

2007 ◽  
Vol 44 (10) ◽  
pp. 1479-1501 ◽  
Author(s):  
John Pojeta Jr. ◽  
Christopher A Stott
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Late Ordovician ◽  
Eastern Canada ◽  
Middle Ordovician ◽  
New Family ◽  
Central Australia ◽  
Northeastern Usa ◽  
Subjective Synonym

The new Ordovician palaeotaxodont family Nucularcidae and the new genus Nucularca are described. Included in Nucularca are four previously described species that have taxodont dentition: N. cingulata (Ulrich) (the type species), N. pectunculoides (Hall), N. lorrainensis (Foerste), and N. gorensis (Foerste). All four species are of Late Ordovician (Cincinnatian Katian) age and occur in eastern Canada and the northeastern USA. Ctenodonta borealis Foerste is regarded as a subjective synonym of Nucularca lorrainensis. No new species names are proposed. The Nucularcidae includes the genera Nucularca and Sthenodonta Pojeta and Gilbert-Tomlinson (1977). Sthenodonta occurs in central Australia in rocks of Middle Ordovician (Darriwilian) age. The 12 family group names previously proposed for Ordovician palaeotaxodonts having taxodont dentition are reviewed and evaluated in the Appendix.

scholarly journals Die Gattung Erratencrinurus Krueger, 1971 (Trilobita; Ordovizium) aus baltoskandischen Geschieben

Fossil Record ◽  
2004 ◽  
Vol 7 (1) ◽  
pp. 69-132
Author(s):  
H.-H. Krueger
Keyword(s):  
New Species ◽  
Hard Rock ◽  
Late Ordovician ◽  
Middle Ordovician ◽  
Different Types ◽  
Single Spine ◽  
Pore Canals ◽  
Different Parts

Aus der mittel- bis oberordovizischen Trilobitenfamilie Encrinuridae, die in Baltoskandia durch die Untergattungen <i>Erratencrinurus</i> und <i>Celtencrinurus</i> repräsentiert wird, werden achtzehn Arten beschrieben, darunter die vier neuen Arten <i>Erratencrinurus (E.) sellinensis, E. (E.) heinrichi, E. (E.) praecapricornu</i> und <i>E. (E.) rhebergeni</i>. Das überwiegende Material stammt aus dem schwer zu präparierenden Ostseekalk. Die Tripp'sche Tuberkelformel wurde der <i>Erratencrinurus</i>-Gruppe angepasst; innerhalb der <i>Erratencrinurus</i>-Gruppe können drei verschiedene Schilder-Typen des scutum rostrale nachgewiesen werden. Unterschiedliche Tuberkeltypen bis hin zu extremen Stacheln wurden beschrieben. Außerdem kann eine Reduzierung von drei Thoraxialstacheln im Mittelordovizium zu einem im oberen Oberordovizium festgestellt werden. Verschiedene Regionen des Panzers von <i>Erratencrinurus (E.) sellinensis</i>, die Porenkanäle besitzen, werden dargestellt. Ein neuer Häutungstyp kann an Panzerhemden von <i>Erratencrinurus (E.) seebachi</i> beschrieben werden. <br><br> In Baltoscandia the Middle to Late Ordovician trilobite family <i>Encrinurida</i> is represented by the two subgenera <i>Erratencrinurus</i> and <i>Celtencrinurus</i>. Out of these 18 species, four new species are described herein. Most of the material comes from the Ostseekalk which is an extremely hard rock and thus difficult to preparate. The tubercle formula after Tripp is applied to the <i>Erratencrinurus</i> group and led to the distinction of three different types of scutum rostrale shields. Various types of tubercles which may even pass into extreme spines are described. The number of thoracic spines becomes reduced from three spines in Middle Ordovician taxa to a single spine in youngest Ordovician species. Different parts of the carapace of <i>Erratencrinurus sellinensis</i> with pore canals are illustrated and a new moulting type of E. <i>seebachi</i> is introduced. New species are <i>E. sellinensis. E. heinrichi, E. praecapricornu and E. (E.) rhebergeni.</i> <br><br> doi:<a href="http://dx.doi.org/10.1002/mmng.20040070106" target="_blank">10.1002/mmng.20040070106</a>

Additions to the Polychaete Fauna of Canada, with Comments on Some Older Records

1954 ◽  
Vol 11 (4) ◽  
pp. 454-471 ◽  
Author(s):  
E. Berkeley ◽  
C. Berkeley
Keyword(s):  
New Species ◽  
North America ◽  
Pacific Coast ◽  
Western Canada ◽  
New Genera ◽  
Eastern Canada ◽  
New Variety ◽  
The Pacific

Descriptions are given of the new genera Neopygospio (type N. laminifera, nov.) and Novobranchus (type N. pacificus, nov.); of the new species Nereis (Eunereis) wailesi, Spio butleri, Neopygospio laminifera, Novobranchus pacificus; and of the new variety pacificus of Distylia volutacornis (Montagu). All are from the Pacific coast of Canada. Synonymy is proposed of Lepidonotus caelorus Moore with L. squamatus (Linné), and of Goniada eximia Ehlers with Ophioglycera gigantea Verrill. In addition to the new species and variety, records of three species new to western Canada are presented, and notes on others. Thirteen species and a variety new to eastern Canada are recorded, one of them new to North America.

A new species of stonecrop (Sedum section Gormania, Crassulaceae) from northern California

Phytotaxa ◽  
2014 ◽  
Vol 159 (2) ◽  
pp. 111
Author(s):  
Peter Zika
Keyword(s):  
United States ◽  
New Species ◽  
The United States ◽  
Northern California ◽  
Klamath Mountains ◽  
Narrow Endemic ◽  
Deep Yellow ◽  
A New Species

Sedum citrinum is described as a narrow endemic from three populations on ultramafic bedrock in the Klamath Mountains of southern Del Norte County, California, in the United States. It is distinguished from Sedum obtusatum subsp. boreale by its flattened inflorescence with elongate lower branches, as well as its deep yellow flowers and yellow anthers. 

Russian Devonian brachiopod genera Cyrtinoides and Komiella in North America

1993 ◽  
Vol 67 (6) ◽  
pp. 952-958 ◽  
Author(s):  
J. G. Johnson ◽  
R. B. Blodgett
Keyword(s):  
New Species ◽  
North America ◽  
Carbonate Platform ◽  
Southern Urals ◽  
Late Devonian ◽  
Western North America ◽  
The Southern Urals ◽  
New Family ◽  
Marine Migration ◽  
Subjective Synonym

The Middle Devonian brachiopod genus Cyrtinoides, described from the southern Urals, is a senior subjective synonym of Mucroclipeus, previously known only from eastern and western North America. The Middle and Late Devonian cyrtinid brachiopod genus Komiella, previously known only from the Timan Range of eastern Europe, is identified from west-central Alaska and Nevada. A new family Komiellidae is proposed. New species are Komiella gilberti, K. magnasulca, and K. stenoparva. Known species of both genera occupy carbonate platform foreslope facies or shelf basins, allowing open marine migration via peripheral biofacies.

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