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Fenestrella
Taxonomy
Synonymy list
| Year | Name and author |
|---|---|
| 1863 | Fenestrella Greville |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
G. †Fenestrella Greville 1863
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. K. Greville 1863 | Frustules free, disciform ; disc with a minute, radiant cellulation, interrupted in the middle by linear bands, composed of parallel lines of cellules, each band terminating in a flat ocellus. This genus is composed for the reception of a solitary but most curious diatom, the relations of which it is not easy to define. The groundwork of the disc is very much that of Coscinodiscus, being composed of radiating lines of cellules, with a marginal row of puncta. But a couple of circular ocelli, at little more than half the radius from the centre, although not conspicuous, are sufficiently evident, and show that we must look for affinities elsewhere. These ocelli are not processes, but definite blank spaces in the cellulation, and have therefore no connection with Eupodiscus or Aulacodiscus. Another peculiarity is a broad, linear-oblong band passing across the middle of the disc, and composed of about eight rows of cellules ; or perhaps it would be more correct to say that two opposite sets of rows of cellules meet at their bases in the centre, and at the other extremity converge as they terminate in the occelli, with which they are evidently connected. There is no umbilicus, the band of cellules intercepting, as it were, the meeting of the radiating lines, the only indication of the central point being a slight interruption in the continuity of the cellules, not sufficiently definite to constitute a character. The convergence of these lines of cellules towards the ocelli seems to point to some alliance with Auliscus, but, on the other hand, there is none between the mastoid processes of that genus and the ocelli of the present one. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available