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Name derivation:

‘Spider disk’ – Arachno- (L>) = spider, the radiating spokes and position of circular ridges on the valve face conjures a spider web, especially in the case of A. ornatus.  A variant in the genus spelling is Arachnoidiscus(Ehrenburg 1849).  Hemiptychus ornatus (Ehrenburg 1848) may take preference.  Why would Ehrenburg describe the same organism with different generic names – and in two consecutive years!  See online.

Classification:

Arachnodiscus  J.W.Bailey ex Ehrenberg  1849. There is only 1 species currently accepted.

Order Arachnoidiscales;  Family Arachnoidiscaceae

Morphology:

 

Similar genera:

 

Habitat:

 

References:

Ehrenberg, C.G.  1849.  Weitere Mittheilung über Resultate bei Anwendung des chromatisch-polarisirten Lichtes für mikroskopische Verhältnisse.  Bericht über die zur Bekanntmachung geeigneten Verhandlungen der Königlich-Preussischen Akademie der Wissenschaften zu Berlin 1849: 55-76.

Guiry, M.D. and G.M. Guiry  2013.  AlgaeBase. World-wide electronic publication, National University of Ireland, Galway.  http://www.algaebase.org; searched on 10 September 2013.

 

 

 

 

 

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