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Species Hastigerina praesiphonifera Blow 1969


Discussion / Comments:
Bolli & Saunders (1985):
The species differs from N. siphonifera (lectotype) in having more distinctly separated chambers which are less inflated. Due to the more evolute coiling, the early, low, trochospiral portion remains visible. According to its author the taxon ranges from within Zone N 7 (Globigerinatella insueta Zone, Early Miocene) to within Zone N 13 (Globigerinoides ruber Zone, Middle Miocene) and develops into H. siphonifera within the Globorotalia fohsi robusta Zone.
Synonym list:
Bolli & Saunders (1985):
1969 Hastigerina siphonifera praesiphonifera Blow. - Blow : p.408 pl.54, figs.7-9
1985 Hastigerina praesiphonifera Blow. - Bolli & Saunders : p.251 42.5; 7,9,12
References:

Blow,W.H. (1969):
Late middle Eocene to Recent planktonic foraminiferal biostratigraphy.
In: Proceedings of the First International Conference on Planktonic Microfossils, Geneva 1967 Vol. 1 Eds: Bronnimann, P.Renz, H.H. p. 199-422

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262
Anonymous: Unedited TaxonConcept data
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