Can foraminiferal paleontologists or interested colleagues help me to identify this species of agglutinated benthonic foraminifera from Paleogene of Egypt??
I suppose it is new species of Gaudryina...or not??
please be calm with my attached photos as i took it by my camera not attached with microscope,, so it may be low in resolution. Thank you.
Amr:
Please provide sharp images along with details about the source of material for realistic taxonomic assessment.
Best
Syed
Dear Amr Zaky.
In spite of low resolution, but the image is clear where the last chamber is inflated. It may be hypotype of Gaudryina laevigata. Be sure it is distributed in many samples and in notable number, to be defined as new var. of Gaudryina laevigata. best regard
Dear Amr
Judging from the vague terminal round aperture(?), I don't think it's a Gaudryina. In Gaudryina this should be an arch at the base of the last chamber. At any rate, prior to speculating on a new species you will need good imagery and of course a good description (including variability) and a proper differential diagnosis from known species. The latter is an absolute must, but unfortunately often disregarded. Good luck with this.
Dear Prof. Robert P. Speijer,
Thank you for your valuable illustration. I revised most species of Gaudryina but it is obvious that this one displayed here is different in its last chamber as globular one with rounded raised aperture. What do you think or suggest about it?. Thank you.
Amr
Dear Amr
I wonder whether it changes to uniserial at the stage shown. I'd search among Siphogaudryina, Pseudogaudryina, Clavulina and alike for something that fits this feature.
Dear Amr
your specimen could be related to Pseudogaudryininella where the last chamber is inflated with terminal rounded aperture, Here is SEM of Pseudogaudryinella compacta from the Paleogene rocks in North Sinai, may help you. best regard
Dear Dr. Hatem Hassan,
A lot of thanks for your sincere help but the last chamber is (rounded) or concaved. Also, if you compare between two speciemens, the first chambers is also different.
what do you think ?
Amr
Dear Dr. Amr
Try to search in Atlas of Paleogene Cosmopolitan Deep-water Agglutinated Foraminifera, Michael A. Kaminski, Felix M. Gradstein and collaborators, 2005 as Grzybowski Foundation Special Publication 10, 547pp.
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