First occurrence of Orthotheca Novák, 1886 (Hyolitha, Early Devonian) in North America

2009 ◽  
Vol 83 (4) ◽  
pp. 588-596 ◽  
Author(s):  
John M. Malinky
Keyword(s):  
North America ◽  
Cross Section ◽  
Type Species ◽  
Lower Devonian ◽  
Early Cambrian ◽  
Early Devonian ◽  
Generic Concept ◽  
Ventral Furrow ◽  
First Occurrence ◽  
Shaped Cross Section

Family Orthothecidae Sysoev, 1958 is herein emended to encompass only hyoliths that possess a very shallow longitudinal ventral concavity and a tightly rounded dorsum, resulting in a near-triangular to only slightly kidney-shaped cross section. Orthotheca Novak, 1886 is restricted to orthothecids that possess longitudinal ornamentation on the dorsum, with Cryptocaris suavis Barrande, 1872 now recognized as the type species of that genus. Based on the revised generic concept, orthothecids from the Lower Devonian (Emsian) Shriver Chert of northeastern Pennsylvania are here included within the genus as Orthotheca shriveri n. sp., making this the first occurrence of the genus in North America. The Orthothecida were a group of sessile, benthic hyoliths that ranged from Early Cambrian to Early Devonian. Their life habit appeared to have included filter-feeding. Their ability to retract the operculum into the shell when closed probably aided in preventing sediment influx, and the ventral furrow may have been an adaptation to differing degrees of firmness of the underlying substrate. Despite faunal linkages between the Devonian paleocontinents, the majority of orthothecid genera seem to be largely restricted to their type areas, although Orthotheca documented herein has eroded slightly their endemic character.

A taxonomic revision of the Early Devonian dalmanitid trilobite Kasachstania Maksimova, 1972 from central Kazakhstan

2020 ◽  
Vol 94 (4) ◽  
pp. 681-695
Author(s):  
Enrique A. Randolfe ◽  
Juan José Rustán ◽  
Arnaud Bignon
Keyword(s):  
United States ◽  
North America ◽  
South America ◽  
Type Species ◽  
Lower Devonian ◽  
Taxonomic Revision ◽  
The United States ◽  
Early Devonian ◽  
Upper Silurian ◽  
New Diagnosis

AbstractThe dalmanitid trilobite Kasachstania Maksimova, 1972, previously reported from the Lower Devonian of Kazakhstan and North America (USA) and the upper Silurian–Lower Devonian of South America (Bolivia and Argentina), is revised. Kasachstania kasachstanica (Balashova in Maksimova,1968) and K. septicostata (Maksimova, 1968) are regarded as junior synonyms of the type species K. saryarkensis (Maksimova, 1960), all from the Lower Devonian of the type locality in central Kazakhstan (northern Balkhash). On the basis of a new diagnosis, K. ulrichi ulrichi (Delo, 1940) from the Emsian of the United States, K. ulrichi asiatica (Maksimova, 1968), K. pristina (Maksimova, 1968), and K. alperovichi Pour et al., 2019, from the Lower Devonian of Kazakhstan, K. andii (Kozłowski, 1923) from the upper Silurian–Lower Devonian of Bolivia, and K. gerardoi Edgecombe and Ramsköld, 1994, from the upper Silurian–Lower Devonian of Bolivia and Argentina are excluded from Kasachstania. This genus, represented only by K. saryarkensis and K. kiikbaica (Maksimova, 1968), is restricted to the Lower Devonian of central Kazakhstan, corresponding to the Balkhash–Mongolo–Okhotsk province in the paleobiogeographic context of the Old World Realm, instead of being nearly cosmopolitan as previously considered. In addition, we provide some remarks about Saryarkella Maksimova, 1978b, a monospecific dalmanitid genus largely overlooked although valid from the Emsian of the same area in central Kazakhstan.

Review of the Devonian camerate crinoid Bogotacrinus scheibei Schmidt from Colombia

1987 ◽  
Vol 61 (4) ◽  
pp. 750-757 ◽  
Author(s):  
George C. Mcintosh
Keyword(s):  
North America ◽  
Western Europe ◽  
Lower Devonian ◽  
Appalachian Basin ◽  
Upper Devonian ◽  
Eastern North America ◽  
Late Devonian ◽  
Early Devonian ◽  
Lower Upper

Two recently collected specimens of Bogotacrinus scheibei Schmidt, 1937, from the Devonian (Emsian–Eifelian) Floresta Formation of Colombia reveal that Bogotacrinus is a dicyclic camerate crinoid genus closely related to Pterinocrinus Goldring, 1923 (Lower–Upper Devonian of eastern North America and western Europe), and Ampurocrinus McIntosh, 1981 (Lower Devonian of Bolivia). The new diplobathrid camerate crinoid family Pterinocrinidae, characterized by species with low conical dicyclic cups and rami composed of compound, bipinnulate brachials, is herein proposed to accommodate these three genera. This family originated in western Europe and migrated into the Malvinokaffric and southern Eastern Americas Realms during the Early Devonian and into the northeastern Appalachian Basin by the Late Devonian.

Eoplicoplasia, a new genus of Silurian–Lower Devonian ambocoeliid brachiopods

1992 ◽  
Vol 66 (3) ◽  
pp. 530-531 ◽  
Author(s):  
J. G. Johnson ◽  
A. C. Lenz
Keyword(s):  
South Africa ◽  
North America ◽  
South America ◽  
Type Species ◽  
Lower Devonian ◽  
New Genus ◽  
Geographic Range

The genus Plicoplasia Boucot, 1959 (type species P. cooperi Boucot, 1959), embraces certain Lower Devonian brachiopods of the subfamily Ambocoeliinae, family Ambocoeliidae. The geographic range of Plicoplasia includes North America (Eastern Americas Realm) and South America and South Africa (Malvinokaffric Realm).

First occurrence of the genus Bicarinatina (Brachiopoda, Inarticulata) from the Middle Devonian in North America (Alaska)

1994 ◽  
Vol 68 (6) ◽  
pp. 1214-1218 ◽  
Author(s):  
Leonid Y. Popov ◽  
Robert B. Blodgett ◽  
Arlene V. Anderson
Keyword(s):  
North America ◽  
Eastern Europe ◽  
Middle Devonian ◽  
Type Species ◽  
Good Reason ◽  
Early Carboniferous ◽  
Arctic Alaska ◽  
The Family ◽  
First Occurrence

The lingulid brachiopod species Bicarinatina kongakutensis n. sp. is recorded here from the Middle Devonian (Eifelian) Ulungarat unit in Arctic Alaska. A restudy of the type species, Bicarinatina bicarinata (Kutorga) from the Middle Devonian (Eifelian) of Eastern Europe, suggests close affinities to the Ordovician genus Pseudolingula and gives good reason to assign Bicarinatina to the family Pseudolingulidae. There are no important points of difference in the morphologies of Bicarinatina and the Early Carboniferous lingulid genus Liralingua and, thus, both genera have been synonymized.

The trilobite Reedops (Phacopidae) in the Lower Devonian of Argentina (Malvinokaffric Realm)

2012 ◽  
Vol 86 (2) ◽  
pp. 253-257 ◽  
Author(s):  
David J. Holloway ◽  
Juan J. Rustán
Keyword(s):  
Type Species ◽  
Lower Devonian ◽  
Middle Part ◽  
Early Devonian ◽  
Northwestern Argentina ◽  
Old World ◽  
Devonian Age ◽  
La Rioja

The trilobite Reedops is documented from strata probably corresponding to the middle part of the Talacasto Formation in the Sierra de las Minitas, at the northernmost extent of the Precordillera in La Rioja Province, northwestern Argentina. The specimens resemble the type species of the genus, R. bronni, indicating a Pragian (Early Devonian) age for the strata, and suggesting the occurrence at this time of faunal exchange between the Old World Realm, particularly the Bohemian area, and the Malvinokaffric Realm. The taxon represents the first Early Devonian macrofaunal element in the Malvinokaffric Realm with global biostratigraphical significance.

Semitubina yukonensis new species, first occurrence of this biogeographically distinctive Old World Realm gastropod genus in the Lower Devonian of the western hemisphere

2001 ◽  
Vol 75 (2) ◽  
pp. 466-470 ◽  
Author(s):  
Robert B. Blodgett ◽  
Jiří Frýda ◽  
Alfred C. Lenz
Keyword(s):  
British Columbia ◽  
Northwest Territories ◽  
Lower Devonian ◽  
Yukon Territory ◽  
Western Hemisphere ◽  
East Central ◽  
Early Devonian ◽  
Western Cordillera ◽  
First Occurrence ◽  
Mackenzie Mountains

Despite the rapidly expanding knowledge of Lower Devonian brachiopod faunas of the Western Cordillera of Canada (Lenz, 1976, 1977a, 1977b, 1982; Ludvigsen, 1970; Perry, 1984; Perry and Lenz, 1978; Perry et al., 1974, 1981), equivalent data on coeval gastropod faunas from this region are non-existent; to date, no publications have appeared in which gastropods have been described. Blodgett et al. (1988, table 1) provided faunal lists for two Lower Devonian localities in Western Canada: 1) Lochkovian-Emsian age collections from the Mackenzie Mountains, Northwest Territories, collected by the late D. G. Perry as part of his Ph.D. dissertation (Perry, 1984); and 2) an early Emsian collection from the Mt. Lloyd George area, British Columbia. We are currently examining the gastropod material recovered by A. C. Lenz from his richly diverse collections in the Royal Creek area, Yukon Territory, equivalent in age to those gathered by D. G. Perry from the Mackenzie Mountains. This note is the first of several papers focused on these paleobiogeographically significant faunas, and it is our desire to ultimately make clear the character of this Early Devonian province, which appears to include strata of British Columbia, Yukon and Northwest Territories, as well as the non-accreted portion of adjacent east-central Alaska.

Observations on the Early Cambrian helicoplacoid echinoderms

1993 ◽  
Vol 67 (4) ◽  
pp. 590-604 ◽  
Author(s):  
J. W. Durham
Keyword(s):  
North America ◽  
Type Species ◽  
Vascular System ◽  
External Morphology ◽  
Early Cambrian ◽  
Western North America ◽  
Higher Taxa ◽  
Atdabanian Stage

The Early Cambrian helicoplacoid echinoderms occur in the Cordilleran Geosyncline of western North America in strata correlated with the Atdabanian Stage of Siberia. Several higher taxa are recognized on the basis of inferred differences in the water vascular system, test organization, and external morphology. These are subclass Polyplacida Durham, with genus Polyplacus Durham; subclass Helicoplacida Durham and Caster, with n. family Helicoplacidae, type genus Helicoplacus Durham and Caster (with tubefeet emerging between two contemporaneous ambulacral plates); n. family Westgardellidae, with type n. genus Westgardella, type species H. curtisi (Durham and Caster) (with tubefeet emerging between two sequential ambulacral plates). The genus Waucobella Durham is also referred to Westgardellidae. Helicoplacus gilberti Durham and Caster, H. everndeni Durham, H. casteri n. sp., H. guthi n. sp., H. sp. a, and H. sp. b are assigned to Helicoplacidae. The genus Westgardella includes H. firbyi Durham, 1967, and W. blancoensis n. sp., in addition to the type species. No evidence of flooring plates separating the radial water vessel from the interior of the test is recognized. The mouth is at the top of the test in the interpretation adopted herein and not lateral as inferred by others; therefore, the ambulacral system is not triradiate. Illustration identified as Helicoplacus curtisi by Paul and Smith includes misidentified plates and should not be referred to this species.

New and revised Lower Devonian Rugosa from Western North America and Tasmania

1998 ◽  
Vol 72 (2) ◽  
pp. 224-245 ◽  
Author(s):  
A.E.H. Pedder
Keyword(s):  
North America ◽  
Type Species ◽  
Lower Devonian ◽  
New Genus ◽  
Yukon Territory ◽  
Western North America ◽  
Family Status ◽  
New Genus And Species ◽  
New Material

Anactolasma yukonanum new genus and species is described from the Pragian of Yukon Territory and is assigned to the Anactolasmatinae, a new subfamily of the Mucophyllidae Hill. Adult stages of Anactolasma resemble gerontic stages of Kobeha Merriam, although the genera have distinct ontogenies. Kobeha is revised on the basis of new material of its type species K. walcotti Merriam. The Papiliophyllinae Stumm are promoted to family status. Kobeha ketophylloides Merriam, from the Pragian of Nevada, and Endophyllum banksi Jell and Hill, from the Pragian of Tasmania, are restudied using new topotypic and other material. A new endophyllid genus named Murphyphyllum is erected for them, with E. banksi as type species. Asarcophyllum ramosum new genus and species, from the Emsian of Nevada, is made type species of a new cyathophyllid genus. Spongophyllum nevadense Stumm and S. expansum Stumm, both also from the Emsian of Nevada, are placed in the new genus, as is Asarcophyllum corona new genus and species, from the Emsian of Yukon Territory. Biostratigraphic settings, with emphasis on associated corals, brachiopods and conodonts, are given for the new and revised genera and species.

Schopfodus, a new conodont genus from the upper Middle Ordovician of eastern North America

1996 ◽  
Vol 70 (1) ◽  
pp. 166-168 ◽  
Author(s):  
Stephen A. Leslie
Keyword(s):  
North America ◽  
Type Species ◽  
New Genus ◽  
Junior Synonym ◽  
Eastern North America ◽  
Additional Material ◽  
Generic Concept ◽  
Middle Ordovician ◽  
Element Type ◽  
Distinct Morphology

Apparatus-based conodont taxonomy has organized the plethora of generic and specific names of form-based taxonomy into a more biologically and phylogenetically sound taxonomy (Schopf, 1966; Webers, 1966; Bergström and Sweet, 1966; Sweet and Bergström, 1972; Rhodes and Austin, 1981; Sweet, 1981, 1988). In the transition from form-based to apparatus-based taxonomy, some conodonts that are not very common, or that have only one or two element types in their apparatus, have remained in a state of form-based taxonomy limbo. An example of this is Trichonodella? tricurva (Schopf, 1966). This relatively uncommon species was known from only one element type (Schopf, 1966) and has not been used in biostratigraphy. Schopf (1966) questioned the generic assignment of T.? tricurva and noted its distinct morphology. Sweet and Bergström (1972) indicated that the type species of Trichonodella (Branson and Mehl, 1948) is a junior synonym of Plectodina aculeata, or of a closely related Plectodina species. Trichonodella? tricurva does not fit within the apparatus-based generic concept of Plectodina (Sweet, 1981), and it is therefore inappropriate to refer it to Trichonodella or Plectodina. No genus contains a tertiopedate element that is morphologically similar to the holotype of T.? tricurva (Schopf, 1966). Additional material from strata that are in part coeval with the stratum typicum of T.? tricurva supports the idea that T.? tricurva represents a new genus. The new genus Schopfodus is proposed for the conodont elements described by Schopf as T.? tricurva and the associated elements of its apparatus.

Systematics of some Lower and Middle Devonian spiriferid brachiopods from Gaspé with a revision of the superfamily Delthyridoidea

1999 ◽  
Vol 73 (6) ◽  
pp. 1056-1077 ◽  
Author(s):  
Martin Bizzarro ◽  
Pierre J. Lespérance
Keyword(s):  
Phylogenetic Analysis ◽  
New Species ◽  
North America ◽  
Middle Devonian ◽  
Lower Devonian ◽  
New Genus ◽  
Stepping Stone ◽  
Taxonomic Treatment ◽  
First Occurrence

The component subfamilies of the Delthyridoidea are critically reviewed and subjected to phylogenetic analysis. This shows the presence of two clades, assigned to the Delthyrididae and Acrospiriferidae, within the superfamily. The subfamilial categories are redefined mainly on the basis of the characters used in the phylogenetic analysis. The spiriferid, mainly delthyridide, Gaspé fauna is formally revised and redescribed. This new taxonomic treatment leads to more precise biostratigraphy and to the recognition of a new subfamily, the Gaspespiriferinae, based on the new genus Gaspespirifer. Five new species are described: Howellella (Howellella) forillonensis, Brachyspirifer (Brachyspirifer) briseboisi, Paraspirifer desbiensi, Brevispirifer florentinus, and B. quebecensis, The occurrence of Brevispirifer species with Middle Devonian chonetaceans confirms the presence of marine Eifelian strata in the Matapédia Valley. Paraspirifer desbiensi n. sp. and two species left in open nomenclature, Vandercammenina sp. and Mucrospirifer sp., have considerable biostratigraphic and biogeographic significance in the Lower Devonian. The first occurrence in the Eastern Americas Realm of the typically Rhenish genera Brachyspirifer, Paraspirifer, and Vandercammenina are in Gaspé. This reinforces the hypothesis that Gaspé served as a stepping stone for Rhenish species invading North America in Pragian and Emsian times, as previously suggested by bivalve biogeography.

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