Record details

Title
    Systematic position of two Early Devonian gastropods with sinistrally heterostrophic shells from the Garra Limestone, New South Wales
Other titles
    Systematic position of two Early Devonian gastropods with sinistrally heterostrophic shells from the Garra Limestone, Larras Lee, New South Wales
Author
    Farrel, J. R.
    Frýda, Jiří
Language
    anglicky
Publication type
    článek v periodiku
Source title - serial
    Alcheringa
Vol./nr.
    Roč. 29, č. 2
Pages
    12
Year
    2005
Thesaurus term
    Gastropoda, Evolution, Palaeozoic
Keyword
    Devonian
    Early
    Garra
    Gastropods
    Heterostrophic
    Limestone
    New
    Position
    Shells
    Sinistrally
    South
    Systematic
    Two
    Wales
Abstract (in czech)
   Two Early Devonian gastropod genera, Anoriostoma and Garraspira gen. nov. from the Garra Limestone with sinistrally heterostrophic shells share several shell features and are placed in the new tribe Anoriostomatini within the subfamily Agnesiinae. In contrast to the other members of the latter subfamily these genera represent a lineage the members of which lost their apertural slit during previous evolution. This fact supports an opinion that the presence or absence of the apertural slit does not necessarily have significance for high-level taxonomy. Morphology of the gerontic whorl in Anoriostoma sinistra and Garraspira inusitata suggest their limited mobility during the last ontogenetic stage.
Abstract (in english)
   Two Early Devonian gastropod genera, Anoriostoma and Garraspira gen. nov. from the Garra Limestone with sinistrally heterostrophic shells share several shell features and are placed in the new tribe Anoriostomatini within the subfamily Agnesiinae. In contrast to the other members of the latter subfamily these genera represent a lineage the members of which lost their apertural slit during previous evolution. This fact supports an opinion that the presence or absence of the apertural slit does not necessarily have significance for high-level taxonomy. Morphology of the gerontic whorl in Anoriostoma sinistra and Garraspira inusitata suggest their limited mobility during the last ontogenetic stage.
Contributor
    Česká geologická služba
Contributor code
    ČGS (RIV)
Source format
    R
Import date
    15. 10. 2014