Paleonet: The "Mysterious Microfossils" are new bugs...

Bruno GRANIER granierbruno at
Mon Mar 24 19:42:46 GMT 2008

  Memoir 1 [2008]: Description and illustration of forty-four gilianelles 
 (microproblematica) and ten other microproblematica of the Cretaceous of the stratotype 
 section at Tercis (Campanian-Maastrichtian boundary), South-West France, by Gilles Serge 
 ODIN.- Format [HTML] or [PDF 15.672 KB] - Reference: [CG2008_M01]
 Odin G.S. (2008).- Description et illustration de quarante-quatre gilianelles 
  (microproblematica) et de dix autres microproblematica du Crétacé de la coupe 
  stratotypique de Tercis (limite Campanien-Maastrichtien), Sud-Ouest France.- Carnets de 
  Géologie - Notebooks on Geology, Brest, Mémoire 2008/01 (CG2008_M01), 82 p., 4 figs. (ONE 
  VIDEO!), 16 pls.

BUT figure captions are available in both French and English, and here is the English Abstract:
 Following acetolysis, microproblematica were collected from indurated carbonates sampled 
 from the stratotype section of the Campanian-Maastrichtian boundary at Tercis (Landes, 
 France). 44 taxa of the gilianelles group (microproblematica probably pertaining to the 
 Protista, Protozoans, Rhizopods) as well as ten other microproblematica were 
 discriminated. To document the taxa in this paper 281 scanning electronic microscope 
 images and 183 optical microscope images are presented. The gilianelles encompass 36 
 species, and 8 subspecies referred to 15 genera of which 14 are new. The new genera are: 
 Tercensella, Azymella, Numismella, Aturella, Scutellella, Corniculum, Caccabella, 
 Orculiella, Pennigerella, Corbella, Aquilegiella, Pocillella, Coraliella, Obbella. Among 
 the other microproblematica, nine species and one subspecies are proposed; they are 
 referred to 7 new genera: Globulella, Piperella, Vasculum, Lucernellus, Cimicellus, 
 Tubella, Pilella. This first general view uses normal taxonomic criteria to recognize and 
 define a group of microfossils of which the identity and the consistency of occurrence 
 are herewith established using the morphological characters of the body of the test, the 
 presence and development of the expansions attached to that body, and its ornamentation. 
 The use of these criteria in an ordered manner suggests that a rigorous taxonomic 
 collocation is feasible, needing only a few other observations before becoming a formal 
 classification. The statigraphic distribution of the taxa provides a means for 
 establishment of a remarkable tool for relative dating in the stratotype section and its 
 immediate vicinity ; microproblematica allow the sequence to be subdivided into intervals 
 of deposition on the order of 0.1 Ma, a length of time shorter than the intervals 
 obtained using the many microfossil or macrofossil groups previously employed to 
 calibrate the stratotype. The Campanian-Maastrichtian boundary is within the limits of 
 the genus Aturella lineage in the basal portion of the range of Aturella edentula.
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