Record details

Title
    Taxonomic reconsideration of Multiplisphaeridium Staplin, 1961 and other acritarch genera with branching processes
Statement of responsibility
    W.A.S. Sarjeant, Milada Vavrdová
Author
    Sarjeant, W. A. S.
    Vavrdová, Milada
Language
    anglicky
Source title - serial
    Geolines
Vol./nr.
    Vol. 5
Pages
    p. 52
Year
    1997
Notes
    4 obr., 3 tab., 5 pl., 6 s.bibl.
Subject group
    Acritarcha
    nový taxon
    paleozoikum-spodní
    popis taxonů
    revize
Keyword
    1961
    Acritarch
    Branching
    Genera
    Multiplisphaeridium
    Other
    Processes
    Reconsideration
    Staplin
    Taxonomic
Abstract (in english)
   The acritarch genus Multiplicisphaeridium, originally proposed in 1961, has expanded in concept until it has come to embrace a great variety of morphologies. Its diagnostic is restricted herein to forms exhibiting at least two major orders of process branching. An emended diagnosis is proposed for the type species, M. ramispinosum. The other 262 species hitherto placed into this genus are reconsidered; 39 species are retained in Multiplicisphaeridium and 122 redistributed among 35 other acritarch genera. Seven other species are considered to be muellerisphaerids; two of these are formally transferred to the genus Aldridgeisphaera, the others being provisionally retained in Multisplicisphaeridium. The residue of species formerly placed in Multiplicisphaeridium have either been reattributed already to other acritarch genera, treated as taxonomic junior synonyms or shown to be invalid or of questionable validity.
   As a consequence of this restudy, the diagnoses of eith other genera - Ammonidium, Diexallophasis, Evittia, Lusatia, Petaloferidium, Tylotopalla, Unellium and Vogtlandia - are emended and their species content critically reviewed. Three new genera - Martinsphaeridium, Rhaetosphaeridium and Wicanderidium - are proposed. This reorganization of species attribution is illustrated graphically; it gives a greater coherence to the stratigraphical ranges of the genera, those of Multiplicisphaeridium, Ammonidium and Martinsphaeridium closely overlapping
Contributor
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
    U
Entered date
    28. 3. 2008
Import date
    8. 8. 2012