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Sphenolithus heteromorphus

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Cenozoic Taxa

Sphenolithus heteromorphus

Edited by Lyndsey on Thu, 10/03/2011 - 13:39

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

S. heteromorphus group

Edited by Lyndsey on Tue, 01/03/2011 - 17:07

Sphenolithus heteromorphus group

Description: Sphenolithus species with prominent, apical spines formed from a single element.

Species included: 

 6-11heteromorphus.JPGhetromorphosus.jpg S. heteromorphus - prominent apical spiine, lower and upper cycles of base of similar size NN4-5
 6-18belemnos.JPGbelemnos.jpg S. belemnos - dart shaped species, lower cylce of base much larger than upper cycle
NN3
6-21delphix.JPGdelphix.jpg S. delphix - small species with long apaical spine and basal spines

NN1
6-24calyculus.JPG calyculus.jpg S. calyculus - small species with long apical spine
NN1
capricornutus.jpg
S. capricornutus - small species with two apical spines
NN1



Remarks: S. heteromorphus and S. belemnos are common species and key bostratigraphic markers. S. delphix, S. capricornutus and S. calyculus are a group of relativel rare small species with well developed apical spines charcteristic of the Earliest Miocene.

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