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Sphenolithus heteromorphus

Edited by Lyndsey on Thu, 10/03/2011 - 12:39

Sphenolithus heteromorphus Deflandre 1953

Description: Apical spine very well-developed. Lateral elements nearly as large as proximal elements.

Remarks: S. heteromorphus has a well developed quadrate base, in which the the upper part is nearly as large as the proximal part, which distinguishes it clearly from S. belemnos. Also the spine typically has a rather bulbous base in contrast to the straight-sided S. belemnos.

Size: Length 5-15 microns, varies considerably in all populations, possibly in part due to diagenetic overgrowth. Width usually c. 3-5 microns.

Original description:

Sphenolithus heteromorphus 050094.jpg

Sp heteromorphus CP Sp heteromorphosus LMsShet265-21NN5.JPG

6-14heteromorphus.JPG 6-13heteromorphus.JPG 6-12heteromorphus.JPG 6-11heteromorphus.JPG

Geological Time Data
Geological Time Periods: 
NN5
NN4
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
Notes on occurrence information: 
Prone to reworking

Comments

Sun, 22/03/2009 - 21:55 — Bryan C. Ladner (not verified)

Species name spelled wrong

Just wanted to point out that the correct spelling of S. heteromorphus is as indicated just now. There is no 'os' after morph, it is simply heteromorphus. I have a PDF copy of the original description by Deflandre (1953) if you need it to confirm my comment.

Thanks,
Bryan Ladner

Thu, 21/05/2009 - 21:01 — Jeremy Young
Jeremy Young's picture

thanks - corrected

Thanks Brian

You are quite right of course, this is something of a blind spot of mine. Anyway I have corrected it now (a moderately arkward process but easier than doing it in a non-database system).

Jeremy

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