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Zygrhablithus
Cenozoic Taxa
Zygrhablithus bijugatus (Deflandre in Deflandre & Fert, 1954) Deflandre, 1959 cornutus Bown, 2005
Edited by Paul Bown on Mon, 10/05/2010 - 12:48Description: Medium-sized spinose holococcolith comprising a rim and central process; the spine is relatively long, has a narrow axial canal and short lateral protrusions or horns at its distal end (two in side view).
Remarks:
Range: NP14b to NP23.
Holotype: Paratype:
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- 131 reads
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Neogene: Zygrhablithus; Zygrhablithus bijugatus
Paleogene: Zygrhablithus bijugatus cornutus
Zygrhablithus bijugatus (Deflandre in Deflandre & Fert, 1954) Deflandre, 1959 nolfi Steurbaut 1990
Edited by Paul Bown on Mon, 10/05/2010 - 12:45Description: Small to medium sized spinose holococcolith comprising a rim and central process; the spine is short and broad (the coccoliths are typically wider than high), has a notch just above the height of the rim, and a rather broad axial canal.
Remarks:
Range: NP10 to NP15b.
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- 82 reads
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Neogene: Zygrhablithus; Zygrhablithus bijugatus
Paleogene: Zygrhablithus bijugatus nolfi
Zygrhablithus bijugatus bijugatus (Deflandre in Deflandre & Fert, 1954) Deflandre, 1959
Edited by Paul Bown on Mon, 10/05/2010 - 12:38Description: Medium to large spinose holococcoliths comprising a rim and central process; the spine has a narrow axial canal and tapers uniformally to a distal point or blunt termination.
Remarks: Zygrhablithus bijugatus is currently differentiated into forms with moderately tall spines (Z. bijugatus bijugatus), short spines (Z. bijugatus nolfii Steurbaut, 1990, Z. sileensis Varol, 1989) and spines with lateral horns (Z. bijugatus cornutus).
Range: NP6 to NN1.
Synonym: Zygrhablithus kerabyi (Perch-Nielsen, 1971)
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- 111 reads
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Neogene: Zygrhablithus; Zygrhablithus bijugatus
Paleogene: Zygrhablithus bijugatus bijugatus
Zygrhablithus Deflandre, 1959
Edited by Paul Bown on Mon, 10/05/2010 - 12:30Description: Spinose holococcoliths, which are birefringent in side view. In plan view the coccoliths are non-birefringent with a distinct figure-of-eight shaped central structure.
Remarks:
Range:
Type species: Zygrhablithus bijugatus (Deflandre in Deflandre & Fert, 1954) [Zygolithus]
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- 91 reads
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Neogene: Zygrhablithus
Paleogene: Zygrhablithus
Zygrhablithus bijugatus
Edited by Lyndsey on Thu, 10/03/2011 - 14:02Zygrhablithus 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:
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.
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- 1112 reads
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Zygrhablithus
Submitted by Jeremy Young on Thu, 11/10/2007 - 14:20- Login or register to post comments
- 103 reads
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Neogene: Zygrhablithus
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