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Revision of Sphenolithus heteromorphosus from Sun, 30/03/2008 - 18:34

Sun, 30/03/2008 - 18:37 — Jeremy Young
hetromorphosus.jpg
Citation: 
Sphenolithus heteromorphosus Deflandre 1953

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

Remarks: S. heteromorphosus 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).

Sp heteromorphus CP Sp heteromorphosus LMsShet265-21NN5.JPG

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

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