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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.
Range: NN4-5 (but rather prone to reworking).
Original description:
- 775 reads
nanno-taxonomy: Sphenolithus; Sphenolithus heteromorphus
Comments
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
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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