Record details

Title
    New Emsian (late Early Devonian) gastropods from Limestone Mountain, Medfra B-4 quadrangle, west-central Alaska (Farewell Terrane), and their paleobiogeographic affinities and evolutionary significance
Statement of responsibility
    Jiří Frýda, Robert B. Blodgett
Author
    Blodgett, Robert B.
    Frýda, Jiří, 1961-
Language
    anglicky
Source title - serial
    Journal of paleontology
Vol./nr.
    Vol. 78, no. 1
Pages
    p. 111-132
Year
    2004
Notes
    4 obr., 8 pl.
    Bibliografie na s. 129-132
    il.
    Zkr. název ser.: J. Paleont.
Classfication no.
    562/569
Subject group
    Archaeogastropoda
    devon
    ems
    Gastropoda
    nový taxon
    paleobiogeografie
    paleontologická rekonstrukce
    paleontologie
    popis taxonů
    schránky
    terán
Geographical name
    USA-Alaska
Keyword
    Affinities
    Alaska
    B-4
    Devonian
    Early
    Emsian
    Evolutionary
    Farewell
    Gastropods
    Late
    Limestone
    Medfra
    Mountain
    New
    Paleobiogeographic
    Quadrangle
    Significance
    Terrane
    West-central
Abstract (in english)
   A significant number of small-sized gastropods are described from Emsian (late Early Devonian) strata on the south flank of Limestone Mountain, Medfra B-4 quadrangle, west-central Alaska, providing the first detailed taxonomie inventory of Emsian gastropods from the Farewell terrane of southwestern and west-central Alaska. The fauna is distinctly of Old World Realm character, and contains not a single species in common with Emsian faunas of nearby nonaccreted rocks of western Canada and east-central Alaska ("Western Canada Province" of Blodgett et al., 2001a). The genera Balbinipleura Bandel and Frýda, 1996 and Nanochilina Frýda, 1998, as well as the subgenus Palaeozygopleura (Rhenozyga) Frýda, 2000, are reported for the first time in the Devonian of the Western Hemisphere.
   The gastropod fauna includes members of three (i.e., Archaeogastropoda, Caenogastropoda, and Heterobranchia) of the five modern gastropod subclasses, illustrating that these gastropod lineages were separated from each other since the Early Devonian. New taxa include the new genera Arctozone, Farewellia, and Medfrazyga, represented by the new species Arctozone cooki, Farewellia heidelbergerae, and Medfrazyga clauticae. Further new species include Quadricarina (Quadricarina?) noklebergi, Balbinipleura krawczynskii, Decorospira lepaini, Decorospira? minutula, Palaeozygopleura (Rhenozyga) reifenstuhli, and Nanochilina gubanovi. In addition, the following previously described gastropods are also discussed and illustrated: Alaskiella medfraensis Frýda and Blodgett, 1998; Alaskacirrus bandeli Frýda and Blodgett, 1998; and Kuskokwimia moorei Frýda and Blodgett, 2001a
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    31. 3. 2008
Import date
    8. 8. 2012