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Helicosphaera perch-nielseniae

Edited by Jeremy Young on Wed, 09/03/2011 - 18:39

Helicosphaera perch-nielseniae (Haq, 1971) Jafar and Martini, 1975 [Helicopontosphaera]

Description: Like H. obliqua but pores narrower and shape more oblong, less spindle-like (N.B. criteria for separating H. obliqua and H. perch-nielseniae vary between authors).

Range: NP23 to NN6.

Original description:

Helicopontosphaera perch-nielsenasae 070239.jpgHelicopontosphaera perch-nielsenasae 070240.jpg

Variant: H. elongata Theodoridis, 1984 - more elongate and with more rectangular outline.

elongata_Theod84.jpg

Geological Time Data
Geological Time Periods: 
NN6
NP23
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
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