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Amaurolithus

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Cenozoic Taxa

Amaurolithus tricorniculatus

Edited by Lyndsey on Thu, 10/03/2011 - 12:41

Amaurolithus tricorniculatus (Gartner, 1967) Gartner and Bukry, 1975 [Ceratolithus]

Description: Right arm extended into apical spur.

Remarks:

Original description:

Ceratolithus tricorniculatus 100189.jpgCeratolithus tricorniculatus 100190.jpgCeratolithus tricorniculatus 100191.jpgCeratolithus tricorniculatus 100192.jpg

10-9tricorniculatus.JPG 10-12tricorniculatus-bizarrus.JPG 10-11tricorniculatus-bizarrus.JPG 10-10tricorniculatus.JPG

Variant: A. bizzarus (Bukry, 1973) Gartner and Bukry, 1975 [Ceratolithus] - an ornate variant of A. tricorniculatus, with additional spines. (NB In the original publication the species-name was spelt bizzarus, so it cannot be corrected to bizarrus, even though that would appear a more logical spelling).

Geological Time Data
Geological Time Periods: 
NN14
NN11b
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Amaurolithus primus

Edited by Lyndsey on Thu, 10/03/2011 - 12:36

Amaurolithus primus (Bukry and Percival, 1971) Gartner and Bukry, 1975 [Ceratolithus]

Description: Simple form with short arms, broad arch and weakly developed keels.

Remarks:

Original description:

Ceratolithus primus 070430.jpgCeratolithus primus 070431.jpg

10-2maurolithis_primus.JPG 10-1maurolithus_primus.JPG

Geological Time Data
Geological Time Periods: 
NN12
NN11b
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Amaurolithus delicatus

Edited by Lyndsey on Thu, 10/03/2011 - 12:35

Amaurolithus delicatus Gartner and Bukry, 1975

Description: Simple horseshoe-shaped amauroliths. Grades into the other morphotypes, especially A. primus and A. tricorniculatus.

Remarks:

Original description:

Amaurolithus delicatus 030311.jpgAmaurolithus delicatus 030312.jpg

10-6primus-delicatus.JPG 10-8delicatus.JPG 10-7delicatus.JPG

Variant: A. ninae Perch-Nielsen, 1977 - like A. delicatus but with well developed apical region.

Geological Time Data
Geological Time Periods: 
NN14
NN11b
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.

Amaurolithus amplificus

Edited by Lyndsey on Thu, 10/03/2011 - 12:34

Amaurolithus amplificus (Bukry and Percival, 1971) Gartner and Bukry, 1975 [Ceratolithus]

Description: Like A. primus but angular; right arm with rodded keel and longer than left.

Original description:

Ceratolithus amplificus 010146.jpgCeratolithus amplificus 010147.jpgCeratolithus amplificus 010148.jpgCeratolithus amplificus 010149.jpg

10-3amplificus.JPG 10-4amplificus.JPG 10-5amplificus.JPG

Alternative combination:

Nicklithus amplificus (Bukry and Percival, 1971) Raffi Backman & Rio 1998.

Raffi et l. (1998) presented evidence that A. primus and A. amplificus evloved independantly from Triquetrotrhabdulus and so proposed a new genus, Nicklithus (in honour of N Shackleton) for A. amplificus. I have followed the conventional nomenclature here, but comments on this are welcome (JRY).

Synonym:

C. dentatus Bukry, 1973.

Geological Time Data
Geological Time Periods: 
NN11b
NN11b
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
Notes on occurrence information: 
Restricted to short interval within NN11B

Amaurolithus

Edited by Lyndsey on Thu, 10/03/2011 - 12:33

Genus Amaurolithus Gartner and Bukry, 1975

Description: Ceratoliths non-birefringent or only weakly birefringent. The c-axis is perpendicular to the plane of horseshoe, but spines on the surface may result it in being tilted from the horizontal and so showing some birefringence, but birefringence is lower than in Ceratolithus and extinction is rarely exactly in line with axis of the ceratolth.

In the SEM Amaurolithus ceratoliths (sometimes termed amauroliths) usually come to rest with the more ornamented surface upward, in this orientation the left hand arm is distinctly curved whilst the right hand arm is relatively straight, but more heavily ornamented.

Remarks: Raffi et al. (1998) documented likely evolutionary relationships between Ceratolithus and the fossil genera Amaurolithus and Triquetrorhabdulus. They presented evidence that A. delicatus, A. amplificus and C. acutus all independently evolved from Triquetrorhabdulus. Since this indicated that Amaurolithus was polypyhletic they proposed dividing the genus in two; Amaurolithus and Nicklithus.

Taxa included:

a._primus.jpg a._delicatus.jpg a._tricorniculatus.jpg
a._amplificus.jpg
A. primus A. delicatus A. tricorniculatus A. amplificus
Amaurolithus Nicklithus

 

 

Original description:

Amaurolithus genus 010125.jpg

Geological Time Data
Geological Time Periods: 
NN14
NN11b
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
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