A New Species of the Dual-mouthed Paracrinoid Bistomiacystis and a Redescription of the Edrioasteroid Edrioaster priscus from the Upper Ordovician Curdsville Member of the Lexington Limestone

2009 ◽  
Vol 83 (1) ◽  
pp. 135-139 ◽  
Author(s):  
Colin D. Sumrall ◽  
Bradley Deline
Keyword(s):  
New Species ◽  
Upper Ordovician ◽  
Lexington Limestone ◽  
A New Species

A new species of the dual-mouthed paracrinoid Bistomiacystis and a redescription of the Edrioasteroid edrioaster priscus from the Upper Ordovician Curdsville Member of the Lexington Limestone

2009 ◽  
Vol 83 (1) ◽  
pp. 135-139 ◽  
Author(s):  
Colin D. Sumrall ◽  
Bradley Deline
Keyword(s):  
New Species ◽  
Upper Ordovician ◽  
Lexington Limestone ◽  
New Material ◽  
Paleontological Society ◽  
Size And Morphology ◽  
A New Species

Echinoderms are important faunal components in the Curdsville Member of the Lexington Limestone. Numerous clades are represented, including Crinoidea (Springer, 1911; Parsley, 1981), Paracrinoidea (Parsley and Mintz, 1975; Parsley, 1981), Cyclocystoidea (undescribed), Edrioasteroidea (Miller and Gurley, 1894; Bell, 1976, 1979), and Stylophora (Parsley, 1981, 1991). Although some of these taxa are well preserved (Springer, 1911), most have been recovered from residues of acidized samples. These later specimens are poorly preserved, obscuring much of the information. Here we describe well preserved specimens recently collected by members of the Kentucky Paleontological Society (Lexington) of two species that add significantly to our understanding of lesser known components of the Curdsville Fauna. Bistomiacystis schrantzi n. sp. is a large paracrinoid bearing two separate ambu1acral systems that lead to two peristomial openings. Our research suggests that this unusual arrangement is consistent with oral areas of other derived blastozoans bearing oral plates. Edrioaster priscus (Miller and Gurley) is a poorly known large edrioasterid edrioasteroid previously known only from specimens preserved in coarse beekite. The new material of this taxon allows for a thorough characterization of this poorly known edrioasteroid and shows that previous assessments of its size and morphology need revision.

The brachiopods Alwynella and Grorudia: homeomorphic plectambonitoids in the Middle and Upper Ordovician of Baltoscandia

2007 ◽  
Vol 98 (3-4) ◽  
pp. 271-280 ◽  
Author(s):  
Linda Hints ◽  
David A. T. Harper
Keyword(s):  
New Species ◽  
Baltic Sea ◽  
Late Ordovician ◽  
Drill Core ◽  
Upper Ordovician ◽  
The Baltic Sea ◽  
New Material ◽  
The Baltic ◽  
A New Species ◽  
Water Facies

ABSTRACTTwo Ordovician plectambonitoid genera, Alwynella and Grorudia, occur in drill core sections of Latvia in the East Baltic, and in exposures and loose blocks on the Swedish Island of Öland in the Baltic Sea. The new material confirms differences between the two taxa that are assigned herein to separate families, Alwynellidae fam. nov. and Grorudiidae Cocks & Rong, 1989. In particular, the undercut cardinalia separates Alwynella from Grorudia and indicates its proximity to the sowerbyellids. The genus Grorudia, which is externally similar to Alwynella, is more closely related to the palaeostrophomenines. A new species Grorudia morrisoni sp. nov. is established in the East Baltic. The specimens from Öland are included tentatively within the genus Grorudia due to lack of interiors. Both Alwynella and Grorudia were confined to deeper-water facies in the Baltic palaeobasin, within successions ranging in age from latest Mid (late Llanvirn) to earliest Late Ordovician (mid Caradoc).

Ontogeny of the proetoid trilobite Stenoblepharum, and relationships of a new species from the Upper Ordovician of Argentina

1997 ◽  
Vol 71 (3) ◽  
pp. 419-433 ◽  
Author(s):  
Gregory D. Edgecombe ◽  
Brian D. E. Chatterton ◽  
Norberto E. Vaccari ◽  
Beatriz G. Waisfeld
Keyword(s):  
New Species ◽  
Life Cycle ◽  
Cladistic Analysis ◽  
Sister Group ◽  
San Juan ◽  
Upper Ordovician ◽  
Growth Series ◽  
Larval Stages ◽  
A New Species

Silicified material from the Early Caradoc part of the Las Aguaditas Formation in San Juan Province, Argentina, includes a nearly complete growth series for a new species of the tropidocoryphid Stenoblepharum Owens, 1973. Cladistic analysis of Stenoblepharum species indicates that S. astinii new species is most closely allied to the Early Caradoc S. strasburgense (Cooper, 1953) from Virginia. Chinese species of Stenoblepharum are sister group to a Baltic/Laurentian clade. A single adult-like protaspid stage occurs in the life cycle of S. astinii, closely resembling the protaspis of Decoroproetus. It is preceded by a non-adult-like first protaspid instar that appears to be characteristic of Proetoidea in general but contrasts markedly with the early larval stages of other taxa in Proetida.

Description and correlation of Late Ordovician conodonts from the D. ornatus and P. pacificus graptolite zones, Road River Group, northern Yukon Territory

1987 ◽  
Vol 24 (7) ◽  
pp. 1450-1464 ◽  
Author(s):  
Alexander D. McCracken
Keyword(s):  
New Species ◽  
New Genus ◽  
Late Ordovician ◽  
Yukon Territory ◽  
Upper Ordovician ◽  
The Road ◽  
Anticosti Island ◽  
Blackstone River ◽  
A New Species

Upper Ordovician carbonate beds within clastic strata of the Road River Group, northern Yukon Territory, have yielded 403 conodont elements representing 25 species; 19 of these are illustrated. Genera present are Amorphognathus, Belodina, Besselodus, Drepanoistodus, Eocarniodus?, Gamachignathus, Icriodella, Noixodontus, Oulodus, Panderodus s.l., Paroistodus?, Plectodina, Protopanderodus, Pseudobelodina s.l., Scabbardella, Strachanognathus, and Walliserodus. The apparatus of new genus A new species A includes a symmetrical and bifurrowed rastrate element.Sparse conodont faunas from Rock River occur in strata below a level bearing graptolites of the D. ornatus Zone and between this zone and the succeeding P. pacificus Zone. These conodonts have a range of "Trentonian" –Gamachian (upper Caradoc –Hirnantian).The fauna from Blackstone River is from a single bed that is 3 m below the G. persculptus Zone? and 13.7 m above the P. pacificus Zone. Although stratigraphically closer to the former, this fauna may be equivalent to a level within the P. pacificus Zone; the conodonts suggest correlation with the late Richmondian Fauna 12 and the lower G. ensifer Zone of Anticosti Island, Quebec. A similar fauna (G. ensifer Zone) occurs in one horizon within the P. pacificus Zone at upper Peel River. One metre above this is the informal D. cf. D. mirus graptolite biohorizon (P. pacificus Zone).The Blackstone and Peel faunas equate to a level within the Ordovician Anceps bands C and D of the Ordovician–Silurian boundary stratotype at Dob's Linn, Scotland. The interval of Fauna 13 and the Gamachian Stage may correspond to Anceps Band E and the C.? extraordinarius Band (and contiguous strata) at Dob's Linn. The base of the G. ensifer Zone and the higher base of the Gamachian are probably late Rawtheyan.

Brachiopoda from the Soom Shale Lagerstätte (Upper Ordovician, South Africa)

2009 ◽  
Vol 83 (4) ◽  
pp. 614-623 ◽  
Author(s):  
Michael G. Bassett ◽  
Leonid E. Popov ◽  
Richard J. Aldridge ◽  
Sarah E. Gabbott ◽  
Johannes N. Theron
Keyword(s):  
South Africa ◽  
New Species ◽  
Clay Mineral ◽  
Upper Ordovician ◽  
Organic Tissue ◽  
A New Species

Within the Soom Shale Lagerstätte of South Africa (Upper Ordovician, Hirnantian), two brachiopod taxa preserve traces of organic tissue. In Trematis, presumed bands of periostracum are preserved on the flanks of the pedicle notch, and clay mineral casts of the pedicle are preserved in many specimens of Kosoidea. Both these genera are organophosphatic-shelled Linguliformea, together with a third genus identified as Plectoglossa. A fourth brachiopod taxon in the fauna belongs within the calcitic-shelled Rhynchonelliformea (Plectothyrella). Kosoidea cedarbergensis is a new species of discinoidean.

Ordovician proetide trilobite Dimeropyge, with a new species from northwestern Canada

1994 ◽  
Vol 68 (3) ◽  
pp. 541-556 ◽  
Author(s):  
Brian D. E. Chatterton
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
The Other ◽  
Upper Ordovician ◽  
Additional Material ◽  
Larval Stages ◽  
Lower Ordovician ◽  
Close Relationship ◽  
A New Species ◽  
Traditional Manner

Dimeropyge öpik, 1937, is a genus currently composed of at least 14 similar Middle (predominantly) to possibly lowest Upper Ordovician species from Laurentia (13 species) and Baltica (one species). Possible Lower Ordovician specimens have been illustrated by Ross (1951). Dimeropyge clintonensis Shaw, 1968, is redescribed, based upon additional material of mature topotypes. A new species of Dimeropyge, D. speyeri, is proposed for material from the Esbataottine Formation in the Mackenzie Mountains, northwestern Canada, previously described as D. clintonensis. A phylogenetic analysis of 10 of the 14 species of this genus is presented (the other species are less completely known, and are related to the analyzed species in a more traditional manner). Ontogenies from protaspid to holaspid stages are provided for D. clintonensis, D. speyeri, and D. virginiensis Whittington and Evitt, 1954. The larval stages of these species are very similar, supporting the close relationship between species assigned to Dimeropyge.

Systematics and paleoecology of Haptocrinus buttsi, a new species of disparid crinoid from the Upper Ordovician Hatter Limestone of central Pennsylvania

2008 ◽  
Vol 82 (3) ◽  
pp. 576-584
Author(s):  
James C. Brower
Keyword(s):  
New Species ◽  
Energy Budget ◽  
Current Velocity ◽  
Filtration Theory ◽  
Upper Ordovician ◽  
Central Pennsylvania ◽  
Food Particles ◽  
A New Species

Three crinoids are known from the Upper Ordovician Hatter Limestone at Union Furnace in central Pennsylvania, i.e., Haptocrinus buttsi n. sp., an unknown crinoid with a lichenocrinid holdfast, and an indeterminate columnal that probably belongs to a crinoid. Two crowns enable H. buttsi n. sp. to be reconstructed. The animal lived about 70 cm above the seafloor and was attached to a strophomenid brachiopod with a lichenocrinid holdfast. Its endotomous arms formed an efficient filtration net that covered much of the water within its planar filtration fan. The application of filtration theory indicates that H. buttsi n. sp. could begin to feed at a comparatively low ambient current velocity and balance its energy budget. Like many other ramulate disparids, H. buttsi n. sp. mainly collected moderately small food particles. As a member of the Tornatilicrinidae, H. buttsi n. sp. is a relatively primitive disparid. Another crinoid taxon bears a longer and thinner stem and a different type of lichenocrinid holdfast cemented to the same strophomenid shell. A third species, most likely a crinoid, is represented by a single columnal. The fauna lived in a quiet water lagoonal area, which is an unusual habitat for Paleozoic crinoids.

Ontogeny and relationships of the Ordovician odontopleurid trilobite Ceratocara, with new species from Argentina and New York

1997 ◽  
Vol 71 (1) ◽  
pp. 108-125 ◽  
Author(s):  
Brian D. E. Chatterton ◽  
Gregory D. Edgecombe ◽  
Norberto E. Vaccari ◽  
Beatriz G. Waisfeld
Keyword(s):  
New York ◽  
Phylogenetic Analysis ◽  
New Species ◽  
San Juan ◽  
Growth Stages ◽  
Upper Ordovician ◽  
Growth Series ◽  
Middle Ordovician ◽  
Argentine Precordillera ◽  
A New Species

A growth series is described for a new species of Ceratocara Ramsköld, 1991, C. argentina, from the Upper Ordovician (Caradoc) part of the Las Aguaditas Formation, near Jáchal in San Juan Province, Argentine Precordillera. Another new species of Ceratocara, C. shawi, is described from the Middle Ordovician (lower Chazy) Crown Point Formation of New York. A phylogenetic analysis is presented for these species, other well-known Ordovician species of Ceratocara, and some Ordovician species of Ceratocephala, with Ceratocephalina tridens Whittington, 1956, as outgroup. The analysis presented supports the monophyly of both Ceratocara and Ceratocephala Warder, 1838, their divergence having occurred by the middle Arenig. The ontogenies of the Ceratocara species from Argentina and New York, complete from protaspid to holaspid growth stages, are some of the best preserved odontopleurid ontogenies described to date. Material of Ceratocephala triacantheis Whittington and Evitt, 1954, from the Crown Point Formation of the Chazy Group of New York, is discriminated from that of Ceratocara shawi.

A new cryptostome bryozoan Ptilotrypa from the Upper Ordovician Yong Limestone Formation: Tethyan sequence of Kumaun Higher Himalaya, India

2019 ◽  
Vol 93 (3) ◽  
pp. 585-591 ◽  
Author(s):  
Narendra K. Swami ◽  
Andrej Ernst ◽  
Satish C. Tripathi ◽  
Prasenjit Barman ◽  
S.K. Bharti ◽  
...  
Keyword(s):  
New Species ◽  
North America ◽  
Primary Production ◽  
Upper Ordovician ◽  
High Primary Production ◽  
Tethys Himalaya ◽  
Colony Shape ◽  
A New Species ◽  
Tethyan Himalaya

AbstractA new species of the Paleozoic bryozoan genus Ptilotrypa of the order Cryptostomata is described from the lower part of the Yong Limestone Formation, Katian, Upper Ordovician of the Kumaun Tethys Himalaya: Ptilotrypa bajpaii new species. The presence of the genus Ptilotrypa in the Tethyan Himalaya suggests paleogeographic connections to the Upper Ordovician of North America and, consequently, Upper Ordovician age for the lower part of the Yong Limestone Formation. This species displays a reticulate colony shape, which suggests an efficient filtering capacity in an environment with a high primary production. Morphological peculiarities and systematic assignment of the genus Ptilotrypa are discussed.UUID: http://zoobank.org/898276c8-2924-4da2-ae96-3392cb2ebbc3

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