New porcellioidean gastropods from early Devonian of Royal Creek area, Yukon Territory, Canada, with notes on their early phylogeny

2008 ◽  
Vol 82 (3) ◽  
pp. 595-603 ◽  
Author(s):  
Jiří Frýda ◽  
Robert B. Blodgett ◽  
Alfred C. Lenz ◽  
Štěpán Manda
Keyword(s):  
Lower Devonian ◽  
Yukon Territory ◽  
Shell Morphology ◽  
Western Canada ◽  
Evolutionary Trend ◽  
Early Devonian ◽  
Old World ◽  
The Road ◽  
Classical Models

This paper presents a description of new gastropods belonging to the superfamily Porcellioidea (Vetigastropoda) from the richly diverse Lower Devonian gastropod fauna of the Road River Formation in the Royal Creek area, Yukon Territory. This fauna belongs to Western Canada Province of the Old World Realm. The Pragian speciesPorcellia(Porcellia)yukonensisn. sp. andPorcellia(Paraporcellia) sp. represent the oldest presently known members of subgeneraPorcellia(Porcellia) andPorcellia(Paraporcellia). Their simple shell ornamentation fits well with an earlier described evolutionary trend in shell morphology of the Porcellinae. Late Pragian to early EmsianPerryconcha pulchran. gen. and n. sp. is the first member of the Porcellioidea bearing a row of tremata on adult teleoconch whorls. The occurrence of this shell feature in the Porcellioidea is additional evidence that the evolution of the apertural slit was much more complicated than has been proposed in classical models of Paleozoic gastropod evolution.

scholarly journals Jardamarekia enigma, a new Early Devonian tryblidioidean from Royal Creek area (Yukon Territory, Canada), and paleobiogeography of the Early Devonian of northwestern Canada

Zootaxa ◽  
2011 ◽  
Vol 2905 (1) ◽  
pp. 57 ◽  
Author(s):  
JIŘÍ FRÝDA ◽  
ROBERT B. BLODGETT ◽  
ALFRED C. LENZ ◽  
BARBORA FRÝDOVÁ
Keyword(s):  
Lower Devonian ◽  
Typical Feature ◽  
Yukon Territory ◽  
Western Canada ◽  
Short Discussion ◽  
Early Devonian ◽  
Continental Shelves ◽  
Molluscan Fauna ◽  
Molluscan Species ◽  
North Western

The Tryblidia (= Monoplacophora) represents the conchiferan class with the fewest Recent taxa in the phylum Mollusca (Haszprunar 2008) and its phylogeny is still poorly known. This group is known already in Cambrian strata (Early Paleozoic) more than 500 Ma ago. Present-day tryblidian species are known mainly from hadal environments (Schwabe 2008, but see also Wilson et al. 2009) in contrast to Paleozoic species, which have been described only from shallow environments of continental shelves of many paleocontinents (e.g., Horný 1962). A typical feature of fossil as well as living tryblidian species is their rarity. The vast majority of species are known only from several specimens (Haszprunar 2008). Furthermore, description of Paleozoic tryblidian molluscs is strongly underrepresented in the literature, despite the existence of diverse material. This is also true for fossils described in the present study based on a diverse silicified molluscan fauna of mostly gastropods collected from Lower Devonian strata of the Royal Creek area, Yukon Territory (Fig. 1) by Alfred C. Lenz and David G. Perry from 1970–1980. Lists of all hitherto described molluscan species as well as detailed information on their age and locality can be found in Lenz (1977a), Blodgett et al. (2001, 2010) and Frýda et al. (2008). Prior to our studies of the Royal Creek tryblidian and gastropod fauna, no descriptions or illustrations were available for Lower Devonian molluscs of north-western Canada, although a short discussion and faunal lists were provided by Blodgett et al. (1988) for Lower Devonian tryblidians and gastropods from the relatively nearby Delorme Formation of Northwest Territories, and early Emsian (late Early Devonian) tryblidians and gastropods from the Mt. Lloyd George area, northeastern British Columbia. The poor knowledge of Paleozoic tryblidians and gastropods faunas of Laurentia (North America) caused difficulties in the evaluation of Early Devonian paleobiogeography (Blodgett et al. 1999). The present paper is focused on the taxonomy of a new Devonian tryblidian limpet, but it provides also useful data for paleobiogeography and biostratigraphy of the Lower Devonian of western Canada.

Kobayashiceras gifuense, a new actinocerid cephalopod from the Lower Devonian of Japan

1998 ◽  
Vol 72 (1) ◽  
pp. 36-38 ◽  
Author(s):  
Shuji Niko
Keyword(s):  
New Species ◽  
Lower Devonian ◽  
Shell Morphology ◽  
Central Japan ◽  
Early Devonian

A new actinocerid genus, Kobayashiceras, is defined on the basis of Kobayashiceras gifuense new species from the Lochkovian (Early Devonian) of the Fukuji Formation, central Japan. This genus shares with known actinocerids in the apical shell morphology, but is diagnosed by its orthocerid like stenosiphonate form in the adoral shell. Its taxonomic and paleobiogeographic implications are discussed.

New occurrences of two Lower Devonian graptolites from northern Yukon

1979 ◽  
Vol 16 (5) ◽  
pp. 1121-1124 ◽  
Author(s):  
Alfred C. Lenz
Keyword(s):  
Lower Devonian ◽  
Yukon Territory ◽  
Canadian Cordillera ◽  
Early Devonian ◽  
First Time ◽  
Richardson Mountains ◽  
New Occurrences

Two species of Early Devonian graptolites are described from the Richardson Mountains, northern Yukon Territory; these are ?Pristiograptus sp. and Monograptus fanicus Koren', the latter being reported for the first time from the northern Canadian Cordillera. Associated grapto lites as well as the presence of M. fanicus indicate a Pragian age. The presence of M. fanicus helps fill the zonal gap between the late Lochkovian hercyniens Zone, and probable late Pragian thomasi and yukonensis Zones, and suggests that lower and upper Pragian substage divisions are possibly recognizable in the graptoiite facies.

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.

Late Early Devonian Dacryoconarid Tentaculites, Northern Yukon Territory

1972 ◽  
Vol 9 (3) ◽  
pp. 297-318 ◽  
Author(s):  
Rolf Ludvigsen
Keyword(s):  
New Species ◽  
Environmental Factors ◽  
Yukon Territory ◽  
Early Devonian ◽  
The Road ◽  
Blackstone River

The late Early Devonian succession in northern Yukon Territory contains a well-preserved dacryoconarid tentaculite fauna dominated by Turkestanella acuaria (Richter) in the upper part of the Road River Formation and T. acuaria and Nowakia parabarrandei Churkin and Carter in the overlying Michelle Formation. Based on the dacryoconarid tentaculite fauna the bulk of the Michelle Formation in the Ogilvie to Hart Rivers area is dated as late Pragian (early Emsian), and based on the graptolite and dacryoconarid tentaculite fauna the uppermost Road River Formation in the Blackstone River area is dated as Pragian (early Emsian or late Siegenian or both). The appearance of species of Nowakia in northern Yukon considerably earlier than in Bohemia is documented. It is concluded that some genera of the Dacryoconarida were influenced in their occurrence by environmental factors. New species described are Turkestanella minuta, Viriatellina michellensis, Guerichina lenini, Styliolina blackstonensis, and Metastyliolina conica.

New early Devonian gastropods from the families Crassimarginatidae (new family) and Scoliostomatidae (new family), Royal Creek Area, Yukon Territory, Canada

2002 ◽  
Vol 76 (2) ◽  
pp. 246-255 ◽  
Author(s):  
Jiří Frýda ◽  
Robert B. Blodgett ◽  
Alfred C. Lenz
Keyword(s):  
New Species ◽  
New Genus ◽  
Yukon Territory ◽  
New Genera ◽  
Morphological Comparison ◽  
The Czech Republic ◽  
Early Devonian ◽  
The Road ◽  
New Family ◽  
The Family

Two new distinctive families, Crassimarginatidae and Scoliostomatidae, each characterized by unusual gerontic apertural morphotypes, are established on the basis of study of the richly diverse Lower Devonian gastropod fauna of the Road River Formation in the Royal Creek area, Yukon Territory. The Early Devonian genus Crassimarginata Jhaveri, 1969, is transferred from the family Palaeotrochidae and placed, together with the new genus Yukonoconcha, into the new family Crassimarginatidae, which is characterized by a pupiform shell with an explanate outer apertural lip in the gerontic growth stage. The new family Scoliostomatidae unites Devonian gastropod genera (Scoliostoma Braun, 1838; Brilonella Kayser, 1873; Anarconcha Horný, 1964; Eoscoliostoma new genus; Mitchellia Koninck, 1877; and Pseudomitchellia new genus), which are characterized by a distinctive, free, twisted (both outwards and backwards) gerontic final half whorl. More detailed morphological comparison of members of this family has allowed their division into two new subfamilies: the Scoliostomatinae and Mitchelliinae. New genera include Yukonoconcha, Eoscoliostoma, and Pseudomitchellia. The former two genera are represented each by a single new species from Yukon Territory, Yukonoconcha pedderi and Eoscoliostoma norrisi. The latter genus is represented by two species, the type Pseudomitchellia bohemica (Perner) from the Koněprusy Limestone (Pragian) of the Czech Republic and Pseudomitchellia macqueeni new species from Yukon Territory.

Early Devonian brachiopods from Satun Province, southern Thailand

1999 ◽  
Vol 73 (5) ◽  
pp. 850-859 ◽  
Author(s):  
A. J. Boucot ◽  
L. R. M. Cocks ◽  
P. R. Racheboeuf
Keyword(s):  
New Species ◽  
New Genus ◽  
New Genus And Species ◽  
Benthic Assemblages ◽  
Early Devonian ◽  
Old World ◽  
Southern Thailand ◽  
Biogeographical Region

Twelve brachiopod taxa are described from the Early Devonian (probable early Emsian) Pa Samed Formation of southern Thailand, including the new genus and species Quasiprosserella samedensis (Ambocoeliidae?) and the new species Plectodonta forteyi, Caplinoplia thailandensis, and Clorinda wongwanichi. They are the first undoubted Devonian brachiopods from Thailand. They represent the deeper-water Benthic Assemblages BA4-5, and, although clearly indicative of the Old World Realm, cannot be assigned to a particular biogeographical region. A new undescribed fauna from the contemporary Zebingyi Formation of Burma (Myanmar) is also noted.

Two new Devonian spine-bearing pleurotomariacean gastropod genera from Alaska

1989 ◽  
Vol 63 (1) ◽  
pp. 47-52 ◽  
Author(s):  
Robert B. Blodgett ◽  
David M. Rohr
Keyword(s):  
Middle Devonian ◽  
New Genera ◽  
Early Devonian ◽  
Old World ◽  
West Central ◽  
Cool Temperate ◽  
Warm Temperate

Two new spine-bearing gastropods, Chlupacispira spinosa n. gen. and sp. and Spinulrichospira cheeneetnukensis n. gen. and sp., are described from the late Early Devonian (Emsian) and early Middle Devonian (Eifelian), respectively, of west-central Alaska. These represent the earliest reported spiny pleurotomariacean gastropods. Otherwise, spinose pleurotomariaceans are known from strata no older than Carboniferous age. Spinulrichospira cheeneetnukensis n. gen. and sp. appears to represent a more highly ornamented derivative of Ulrichospira Donald. Both new genera are part of the more highly ornamented fauna which occurred in warm equatorial waters of the Old World Realm during the Early and Middle Devonian, in contrast to more weakly ornamented shells of the Eastern Americas Realm and even more weakly ornamented (almost totally “plain”) shells of the Malvinokaffric Realm. The latter two realms are thought to represent subtropical to warm temperate and cool temperate to cool polar conditions, respectively.

The sequence and correlation of Early Ordovician (Arenig) graptolite faunas in the Richardson Trough and Misty Creek Embayment, Yukon Territory and District of Mackenzie, Canada

2006 ◽  
Vol 43 (12) ◽  
pp. 1791-1820 ◽  
Author(s):  
D E Jackson ◽  
A C Lenz
Keyword(s):  
Northwest Territories ◽  
Deep Water ◽  
Yukon Territory ◽  
Early Ordovician ◽  
The Road ◽  
Bedded Chert ◽  
First Occurrence ◽  
Mackenzie Mountains ◽  
First Time

Four graptolite biozones are recorded from the Arenig portion of the Road River Group in the Richardson and Mackenzie mountains in the Yukon and Northwest Territories. In ascending order, these zones are Tetragraptus approximatus, Pendeograptus fruticosus, Didymograptus bifidus, and Parisograptus caduceus australis (new). The Castlemainian stage may be represented by nongraptolitic massive bedded chert. The Arenig–Llanvirn boundary is drawn below the first occurrence of Undulograptus austrodentatus. Fifty-four graptolite taxa are present, and 16 of these species and subspecies are recorded for the first time in this deep-water biotope, namely, Didymograptus? cf. adamantinus, D. asperus, D. dilatans, D. cf. kurcki, D. validus communis, Holmograptus aff. leptograptoides, H. sp. A, Isograptus? sp. nov. A, I. ? dilemma, Keblograptus geminus, Pseudisograptus manubriatus harrisi, Ps. m. koi, Ps. m. janus, Ps. cf. tau, Xiphograptus lofuensis, and Zygograptus cf. abnormis.

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