Upper Triassic corals from Nevada, western North America, and the implications for paleoecology and paleogeography

2013 ◽  
Vol 87 (5) ◽  
pp. 934-964 ◽  
Author(s):  
Ewa Roniewicz ◽  
George D. Stanley
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Upper Triassic ◽  
Late Triassic ◽  
Western North America ◽  
North American Cordillera ◽  
Coral Fauna ◽  
Taxonomic Analysis ◽  
The North

Late Carnian–early Norian corals from the Luning and Osobb formations in west-central Nevada represent an important Late Triassic fauna for understanding the paleoecology and the paleogeography of the eastern Panthalassa region during Late Triassic time. The corals occur in bedded limestone representing biostromes and patch reefs and their composition presages the important global changeover of faunas of the intra-Norian interval. A taxonomic analysis of over 60 specimens reveals a majority of colonial corals ranging from cerioid, astreoid (i.e., cerioid-plocoid lacking walls), meandroid and thamnasterioid types. Surprisingly, remnants of the original aragonite microstructure remain in some specimens, allowing a better comparison with more remote Tethyan corals. In total, 14 genera have been identified from Nevada while two genera remain undetermined. The fauna is composed of species considered typical of both the North American Cordillera and cratonal South America. The following genera and species are new and endemic to the Americas:Khytrastrea silberlingiandK. cuifiamorpha,Flexastrea serialis,Nevadoseris punctata,Areaseris nevadaensisand a new genusMinasteria(withAstrocoenia shastensisSmith, 1927 as type species). Likewise are the new species:Margarogyra silberlingiandCurtoseris dunlapcanyonae. GeneraMeandrovolzeia,Margarogyra,Ceriostella,Ampakabastraea,Retiophyllia,Distichomeandra,Curtoseris,ThamnasteriaandAstraeomorphaprovide important links to the former Tethys province. The revised coral fauna changes previous views of the close taxonomic similarity with the Tethys, instead producing a paleogeographic pattern emphasizing a much greater degree of endemism. This pattern emphasizes the isolation of Nevada from the Tethys and the similarities with some outboard terranes of the Cordillera.

Bryozoa of the Mission Argillite (Permian), northeastern Washington

2000 ◽  
Vol 74 (4) ◽  
pp. 545-570 ◽  
Author(s):  
Ernest H. Gilmour ◽  
Edward M. Snyder
Keyword(s):  
New Species ◽  
Pacific Ocean ◽  
North American ◽  
Type Species ◽  
New Genus ◽  
Western Pacific ◽  
North American Plate ◽  
Western Pacific Ocean ◽  
Late Permian ◽  
The North

Fifteen species of Late Permian bryozoans occur in a biohermal bank in the Mission Argillite of northeastern Washington. These include two species conspecific with species described from Japan and 13 new species, one of which is the type species of a new genus. The presence of two species, Dyscritella iwaizakiensis Sakagami, 1961, and Hayasakapora cf. erectoradiata Sakagami, 1960, previously reported from Japan, and the similarity of new species with those previously described from Japan, China and Russia supports the idea that these rocks were originally deposited in the southeastern or central western Pacific Ocean and subsequently accreted to the North American Plate.Bryozoans and previously reported fusulinids indicate that the biohermal bank is latest Wordian (Kazanian).Newly described bryozoans include the new genus and type species Sakagamiina easternensis belonging to the Timanodictyidae. Other new species are Fistuliramus pacificus, Meekoporella inflecta, Neoeridotrypella missionensis, Coeloclemis urhausenii, Tabulipora colvillensis, Rhombotrypella kettlensis, Pamirella oculus, Pinegopora petita, Wjatkella nanea, Alternifenestella vagrantia, Polypora arbusca, and Mackinneyella stylettia.

scholarly journals A Review of Necrotauliids from the Triassic/Jurassic of England (Trichoptera: Necrotauliidae)

2018 ◽  
Vol 2018 ◽  
pp. 1-12 ◽  
Author(s):  
Richard S. Kelly ◽  
Andrew J. Ross ◽  
Robert A. Coram
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Type Locality ◽  
Late Triassic ◽  
Type Specimens ◽  
The Family ◽  
The Uk ◽  
A New Species ◽  
Paraphyletic Assemblage

Species previously attributed to Necrotauliidae are revised from the Late Triassic and Early Jurassic of England based on examination of type specimens and non-type material. The necrotauliids have been considered as a basal family of caddisflies (Trichoptera) or as a paraphyletic assemblage of stem-amphiesmenopterans. Herein a new genus, Austaulius, is erected which includes all Lilstock Formation∖Lower Lias material from England; the previously described species are synonymized with A. furcatus and a new species, A. haustrum, is described from the Dorset Coast, the holotype of which preserves synapomorphic traits of the Trichoptera not previously described suggesting that the family is trichopteran. The type genus remains Necrotaulius and type species N. parvulus (Geinitz, 1884) from the type locality of Dobbertin, Germany. One species of Necrotaulius is represented in the UK, N. parvulus, which is found in the Upper Lias.

Late Triassic megalodontids (Bivalvia) from the headwaters of the Yangtze River, Qinghai province, west China

2007 ◽  
Vol 81 (6) ◽  
pp. 1327-1347 ◽  
Author(s):  
Huazhou Yao ◽  
Renjie Zhang ◽  
John Pojeta ◽  
Jinggen Sha ◽  
Jianxiong Wang
Keyword(s):  
New Species ◽  
Yangtze River ◽  
Type Species ◽  
Upper Triassic ◽  
Late Triassic ◽  
The Yangtze River ◽  
External Appearance ◽  
West China ◽  
Qinghai Province

A bivalve faunule of six species is described from the Upper Triassic Jiapila Formation at the headwaters of the Yangtze River, southern Qinghai, China. The new species, Neomegalodon cornutus and Quemocuomegalodon circularis, are described. The type species of Quemocuomegalodon, Q. orientus, is revised. Quemocuomegalodon orientus Yao, Sha, and Zhang (2003) is now known from abundant, well-preserved specimens that show great variation in shape, size, thickness of shell, and dentition, and the species Q. longitatus, Yao, Sha, and Zhang (2003) is now placed in synonymy with Q. orientus. There are significant morphologic differences between the external appearance of shelled specimens and the internal molds of species of Quemocuomegalodon. This suggests the need for the re-evaluation of many megalodontid species from elsewhere that are known only from internal molds.

Late Paleozoic edrioasteroids (Echinodermata) from the North American Midcontinent

1996 ◽  
Vol 70 (6) ◽  
pp. 969-985 ◽  
Author(s):  
Colin D. Sumrall
Keyword(s):  
New Species ◽  
North American ◽  
Type Species ◽  
New Genus ◽  
Late Paleozoic ◽  
New Genus And Species ◽  
New Classification ◽  
The North ◽  
Three New Species ◽  
To Receive

A new classification is proposed for late Paleozoic Edrioasteroidea (Echinodermata), separating forms with the advanced clavate thecal design from those with the ancestral pyrgate thecal design, and a new Subfamily Discocystinae is erected to receive the clavate agelacrinitid edrioasteroids. Lepidodiscus Meek and Worthen is restricted to the pyrgate type species L. squamosus (Meek and Worthen) and two unnamed species, whereas the clavate L. laudoni (Bassler) is assigned to Clavidiscus, new genus. The clavate Discocystis priesti Strimple and three new species, Hypsiclavus kinsleyi, new genus and species, Hypsiclavus huntsvillensis, new genus and species, and Hypsiclavus guensburgi, new genus and species, are placed in Hypsiclavus, new genus. Bostryclavus, new genus, is erected to receive Echinodiscus sampsoni Miller. A redescription of Discocystis kaskaskiensis (Hall) and a diagnosis of Spiraclavus Sumrall are included for completeness.

Late Triassic Bivalvia (chiefly Halobiidae and Monotidae) from the Pardonet Formation, Williston Lake area, northeastern British Columbia, Canada

2011 ◽  
Vol 85 (4) ◽  
pp. 613-664 ◽  
Author(s):  
Christopher A. McRoberts
Keyword(s):  
British Columbia ◽  
Sedimentary Basin ◽  
Upper Triassic ◽  
Late Triassic ◽  
Continuous Series ◽  
Lake Area ◽  
North American Cordillera ◽  
The North ◽  
The Subject ◽  
Nearly Continuous

The Upper Triassic of the Williston Lake area of northeastern British Columbia is represented by a nearly continuous series of fossil-rich sediments that were deposited in the Western Canadian Sedimentary Basin in an offshore mid-paleolatitude setting on the western margin of cratonic Pangea. The fossils in this report come primarily from the upper Carnian–upper Norian Pardonet Formation, which has been the subject of numerous paleontologic studies on ammonoids and conodonts, yet has received little attention with regard to its bivalve fauna. Fossil bivalves belonging to the thin-shelled bivalve genera Halobia, Eomonotis, and Monotis dominate the benthic macrofauna and occur within unique shell accumulations that are interpreted to represent oxygen-controlled monospecific paleocommumities that have undergone little post-mortem transportation. Systematic analyses of more than 1,000 individual bivalve specimens resulted in the identification of 25 species-rank taxa, a majority of which belong to the pterioid genus Halobia and the pectinoid genera Eomonotis and Monotis. Of these, four new species are recognized, including 1) upper Carnian Halobia tozeri n. sp. characterized by a unique triangular outline; 2) lowermost Norian Halobia selwyni n. sp. closely related to H. beyrichi and first appearing with H. austriaca which is proposed as a potential datum for the Carnian–Norian boundary; 3) Norian Meleagrinella mclearni n. sp., a new name for previously identified species; and 4) upper Norian Otaparia norica n. sp. which has a delicate thin shell, unique outline, and fine ornament. A revised and refined biochronology of Upper Triassic Bivalvia (chiefly Halobiidae and Monotidae) integrated with conodont and ammonoid zones and standard Triassic stages is presented for the Upper Triassic of the Williston Lake area and permits enhanced correlation to coeval faunas elsewhere in the North American Cordillera, and to the Boreal, Panthalassan and Tethyan faunal realms.

The lower Mississippian (Kinderhookian) ammonoidGoniocyclusfrom the Hannibal Shale, Missouri

2002 ◽  
Vol 76 (1) ◽  
pp. 187-189 ◽  
Author(s):  
David M. Work
Keyword(s):  
New Species ◽  
North American ◽  
Type Species ◽  
Undescribed Species ◽  
North American Cordillera ◽  
The North ◽  
Conodont Zone

The Pericyclidae are distinctive ancestral (middle Tournaisian-lower Viséan) Goniatitina characterized by prominent transverse sculpture. Ancestry of the group was inGoniocyclusGordon, 1986 (type species,Goniatites blairiMiller and Gurley, 1896). These diminutive (generally less than 35 mm), coarsely ribbed pericyclids are distinguished by sharply angular ventral sinuses and sutures with primitive, incipiently bifid ventral lobes.Goniocycluscharacterizes the late Kinderhookian (late middle Tournaisian)Siphonodella isosticha—UpperSiphonodella crenulataconodont Zone where it is represented by at least six distinctive species in the North American Cordillera and Midcontinent (Gordon, 1986). The earliest record, which extends the generic range back to the base of the traditional middle Tournaisian, is a widely discussed, but previously undescribed, species from the Hannibal Shale of Missouri (Work et al., 1988; Becker, 1993a, 1993b; Popov and Kusina, 1997) described herein asGoniocyclus hannibalensisnew species.

Baiotomeus, a new ptilodontid multituberculate (Mammalia) from the middle Paleocene of western North America

1987 ◽  
Vol 61 (3) ◽  
pp. 595-603 ◽  
Author(s):  
David W. Krause
Keyword(s):  
Species Richness ◽  
New Species ◽  
North America ◽  
Type Species ◽  
New Genus ◽  
Western North America ◽  
Land Mammal

Baiotomeus is a new genus of ptilodontid multituberculate from the late Torrejonian Land-Mammal Age (late middle Paleocene) of western North America. Baiotomeus douglassi (Simpson), the type species, has been assigned, at one time or another, to Ptilodus, Mimetodon, and Neoplagiaulax. In addition, a second, new species, B. lamberti, from three localities in the Medicine Rocks area of southeastern Montana is reported here. The Medicine Rocks localities are tentatively assigned a latest Torrejonian age, younger than localities yielding B. douglassi and younger than previously suggested on the basis of plesiadapid primates.Multituberculates appear to have attained their highest species richness during the Torrejonian Land-Mammal Age, but the discovery of B. lamberti illustrates that our knowledge of multituberculate diversity is incomplete from even that interval of time.

CERATOZETIDAE (ACARI: ORIBATEI) OF THE WESTERN NORTH AMERICAN SUBARCTIC

1986 ◽  
Vol 118 (10) ◽  
pp. 991-1057 ◽  
Author(s):  
Valerie M. Behan-Pelletier
Keyword(s):  
New Species ◽  
North America ◽  
North American ◽  
New Genus ◽  
Oribatid Mite ◽  
Western North America ◽  
The North ◽  
North American Arctic ◽  
Mite Family

AbstractRepresentatives of the oribatid mite family Ceratozetidae of subarctic western North America, including 14 species in eight genera, are treated. A new genus Laminizetes, and eight new species, Diapterobates siccatus, Trichoribates ogilviensis, Laminizetes fortispinosus, Ceratozetes inupiaq, C. kutchin, C. fjellbergi, Sphaerozetes firthensis, and Melanozetes tanana, are proposed, and Dentizetes rudentiger Hammer, Diapterobates humeralis (Hermann), Neogymnobates luteus (Hammer), Trichoribates striatus Hammer, Sphaerozetes castaneus Hammer, and Melanozetes meridianus Sellnick are redescribed. Immatures of Dentizetes rudentiger and Sphaerozetes firthensis are described. A key to the adults of the 31 species of Ceratozetidae recorded from the western North American arctic and subarctic is given. Relationships among the 12 genera in the Ceratozetidae recorded from the North American arctic and subarctic are discussed.

Silky lacewings (Neuroptera: Psychopsidae) from the Eocene-Paleocene transition of Denmark with a review of the fossil record and comments on phylogeny and zoogeography

2001 ◽  
Vol 32 (4) ◽  
pp. 419-438 ◽  
Author(s):  
Stig Andersen
Keyword(s):  
Fossil Record ◽  
Type Species ◽  
New Genus ◽  
Upper Triassic ◽  
Wing Venation ◽  
Fossil Species ◽  
The North ◽  
Fossil Insect ◽  
Insect Wings ◽  
Extinction Events

AbstractThirty-four fossil insect wings from the Fur Formation of Denmark (Eocene-Paleocene transition) are recognised as neuropteran forewings standing close to extant Psychopsidae (silky lacewings). This affinity is based primarily on their possession of a vena triplica in the forewing. A new genus, Palaeopsychops gen. n. and four new species, P. latifasciatus sp. n. (type species), P. abruptus sp. n., P. angustifasciatus sp. n. and P. maculatus sp. n. are described. Palaeopsychops is identified mainly by the shape of vena triplica and costal space and by the venation of radial space. The new genus appears most closely related to some fossil species of the North American Eocene, while it appears only remotely related to the psychopsid genus Propsychopsis Krüger described from Baltic amber (European Eocene). The different species of Palaeopsychops are separated on relatively minor differences in wing venation and pigmentation. The entire fossil record of psychopsid-like Neuroptera are reviewed and issues of phylogeny and zoogeography are discussed. A total of 5 extant and 21 fossil genera are recognised in the Psychopsidae lineage based on an extended vena triplica definition. The lineage goes back at least to the Upper Triassic. An attempt is made to gather the psychopsid genera into larger natural entities. Extant Psychopsidae are restricted to S. Africa, Australia and SE. Asia. It is suggested that the present relictual distribution is mainly caused by extinction events.

Lower Devonian (Emsian) rugosa of the Izarne Formation, Montagne Noire, France

1998 ◽  
Vol 72 (6) ◽  
pp. 967-991 ◽  
Author(s):  
Alan E. H. Pedder ◽  
Raimund Feist
Keyword(s):  
New Species ◽  
Lower Devonian ◽  
New Genus ◽  
New Genus And Species ◽  
Coral Fauna ◽  
The North ◽  
Lower Member ◽  
Rugose Corals ◽  
Montagne Noire ◽  
Middle Member

An account of the systematics, biostratigraphy, ecological setting and the biogeographic implications of rugose corals from olistoliths of the Cabrières area is given. Corals of the lower member of the Izarne Formation are dated by conodonts as gronbergi Zone age, and include Lythophyllum sp. indet., Calceola sandalina (Linné), Tryplasma sp. A, Breviphrentis roharti Pedder new species, B. exigua Pedder new species, and Aqishaphyllum sp. A. Corals from the middle member of the formation include Frechocystis pertinax Pedder new genus and species, Calceola sp. undet., Rhizophyllum sp. aff. R. ukalundense Hill and Jell, Tryplasma enorme Pedder new species, Tryplasma sp. A, Breviphrentis sp. A, Platysmatophyllum halleri Pedder new genus and species, Pseudochonophyllum sentum Pedder new species, and Izarneophyllum barroisi (Frech) new genus. No age significant conodont has been recovered from the middle member. However, scutelluid trilobites, which, together with other trilobites, evidently used the underside of Izarne corals for shelter during molting, provide correlation with conodont sequences in the nappe domain to the north and southwest of Cabrières. From this line of evidence, the middle Izarne coral fauna is deduced to be nothoperbonus Zone age. The association of a variety of benthic trilobites, all with large eyes, provides evidence of a photic zone environment for the middle Izarne corals.Rugose corals from the Izarne Formation belong to the Old World Realm and have nothing in common with similar age Rugosa of the Eastern Americas Realm. This implies that the dissolution of the boundary between these realms, which occurred in the Middle Devonian, did not begin before latest Emsian time.

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