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Helicosphaera walbersdorfensis

Edited by Jeremy Young on Wed, 09/03/2011 - 18:40

Helicosphaera walbersdorfensis Muller, 1974

Description: Small to medium sized. Flange ends in broad wing. Central-area with two normally oblique pores separated by narrow conjunct bar. N.B. H. walbersdorfensis sensu Varol (1989) = H. stalis of other authors.

Remarks:

Synonym: H. mullerae Varol, 1989 - alternative name for H. walbersdorfensis based on interpretation that the type specimen is atypical.

Variants: H. californiana Bukry, 1981 - bar absent, cf. Theodoridis (1984) this is usually a result of dissolution. H. minuta Muller, 1981 - without prominent wing, or possibly a senior synonym of H. stalis.

Geological Time Data
Geological Time Periods: 
NN7
NN5
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
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