The Fossil Diatom Thalassiosira oranica, n. sp.

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Abstract
The fossil diatom Coscinodiscus eccentricus Ehrenberg from Oran, Algeria is described as Thalassiosira oranica, n. sp., distinguished from the Recent Thalassiosira eccentrica (Ehrenberg) Cleve by process pattern and areolation. It belongs to the group of Thalassiosira with one central strutted process, one marginal ring of stutted processes, and one marginal labiate process. Other conspicuous morphological features are irregularly situated marginal occluded processes, a linear to eccentric areola array, and a ribbed flange at the edge of the valve mantle. This pattern of strutted processes and areolation is usually regarded as regarded as representative of ancient Thalassiosira species, an assumption here supported by the simple construction of the strutted process. The literature brings no evidence the T. oranica is living in the sea today.

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