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Zygrhablithus bijugatus

Edited by Lyndsey on Thu, 10/03/2011 - 14:02

Zygrhablithus bijugatus (Deflandre in Deflandre and Fert, 1954) Deflandre, 1959 [Zygolithus]

Description: Large rod-shaped holococcolith with small basal disk.

Remarks: In well-preserved material (E.g. Bown 2005) it can be seen that these are cavate holococcoliths, i.e. they have an internal cavity. Usually howevr with overgrowth this cavitiy is filled and the holococcolith develops nirregular form.

Original description:

Zygolithus bijugatus 100102.jpg

6-27bijugatus.JPG

Synonyms (list from Aubry 1988):

  • Isthmolithus claviformis Bronnimann & Stradner 1960
  • Lucianorhabdus dispar Stradner 1961
  • Pseudozygrhablithus altus Haq 1971
  • Pseudozygrhablithus latus Haq 1971
  • Pseudozygrhablithus comprimus Haq 1971
  • Rhabdosphaera semiformis Bramlette & Sullivan 1961
  • Sujkowskiella enigmatica Hay Mohler & Wade 1966

Of these I. claviformis, S. enigmatica and R. semiformis were all based on isolated half or quarter specimens of Z. bijugatus.

Geological Time Data
Geological Time Periods: 
NN1
Paleogene
Biblio Reference: 
Young, JR.  1998.  Neogene. Calcareous nannofossil biostratigraphy. :225-265.
Notes on occurrence information: 
This species is also rarely seen in NN2 (see de Kaenel and Villa, 1996).
Scratchpads developed and conceived by: Vince Smith, Simon Rycroft, Dave Roberts, Ben Scott...