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Hemidiscus
Taxonomy
Hemidiscus was named by Wallich (1860). It is extant.
It was assigned to Bacillariophyceae by Wallich (1860); and to Hemidiscaceae by Hasle and Syvertsen (1996).
It was assigned to Bacillariophyceae by Wallich (1860); and to Hemidiscaceae by Hasle and Syvertsen (1996).
Synonymy list
| Year | Name and author |
|---|---|
| 1860 | Hemidiscus Wallich pp. 42-43 |
| 1996 | Hemidiscus Hasle and Syvertsen p. 116 |
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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. Hemidiscus Wallich 1860
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G.C. Wallich 1860 | Hemidiscus, nov. gen., Wall.
Frustules free. Valve arcuate, with a marginal nodule. Cellulation hexagonal, radiate. The valvular structure of this genus indicates a very close affinity to Eupodiscus, and the discoidal forms generally. Its peculiar outline, and the invariable character of the unequally developed connecting zones, distinguish it from that genus. We have examples of similar unequal development in the connecting zones of some Surirellae, Gomphonema, Podosphenia, Rhipidophora, Licinophora and Meridion ; in all of which genera the '' cuneate'' character of the frustule is, in a great measure, due to its occurrence. |
Measurements
No measurements are available
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| Source: c = class | |||||
| Reference: Kiessling 2004 | |||||
Collections
No collection or age range data are available