Taxon Account

Achnanthidium subatomus (Hustedt) H. Lange-Bertalot; 1999; 279 (273)

Synonymy

Achnanthes biasolettiana var. subatomus Lange-Bertalot in Lange-Bertalot & Krammer 1989
Achnanthes subatomus Hustedt 1939

Key references

Hofmann G., Werum M., Lange-Bertalot H. 2011. Diatomeen im Süßwasser-Benthos von Mitteleuropa. A.R.G. Gantner, Ruggell. 908 pp

Morphology

Shape
Valves linear to linear-elliptic with rounded, rarely slightly subrostrate ends. Frustules in girdle view bent.

Symmetry
Valves isopolar, bilaterally symmetrical.

Valve
Frustules heterovalvar with concave raphe valve and convex rapheless valve.

Striae
Striae more or less parallel in the central part of the valve, becoming radiate towards the apices, striae denser towards the ends on the raphe valve, almost equidistant throughout on the rapheless valve, striae visible and sometimes punctate in LM.

Axial area
Narrow linear axial area, widening towards the centre on the raphe valve.

Central area
Small rounded or rhombic, or inconspicuous central area on the raphe valve, inconspicuous on the rapheless valve.

Raphe
Straight, filiform raphe with slightly expanded proximal ends and deflected distal ends. Internally proximal ends deflected in opposite directions.


SEM morphology
Areolae occluded by cribra. Some areolae on the raphe and rapheless valve can be doubled.

Literature

References are given in chronological order.

Reference
Citation
Hustedt F. 1939. Die Diatomeenflora des Küstengebietes der Nordsee vom Dollart bis zur Elbemündung. I. Die Diatomeenflora in den Sedimenten der unteren Ems sowie auf den Watten in der Leybucht, des Memmert und bei der Insel Juist. Abhandlungen des Naturwissenschaftlichen Verein zu Bremen. 31(2/3): 571-677.
Hustedt F. 1939. Diatomeen aus den Pyrenäen. Berichte der Deutschen Botanischen Gesellschaft. 56: 543-572. Description; Taxonomy; Morphology; Illustrations
Lange-Bertalot H., Krammer K. 1989. Achnanthes eine Monographie der Gattung mit Definition der Gattung Cocconeis und Nachträgen zu den Naviculaceae. Bibliotheca Diatomologica Vol. 18. 393 pp; 100 pls Morphology; Taxonomy; Illustrations
Lange-Bertalot H. 1999. Neue Kombinationen von Taxa aus Achnanthes Bory (sensu lato). 6. Lange-Bertalot, H. (ed.), Iconographia Diatomologica. Annotated Diatom Micrographs. Vol. 6. Phytogeography-Diversity-Taxonomy. Koeltz Scientific Books, Königstein, Germany. 276-289 pp Taxonomy
Hofmann G., Werum M., Lange-Bertalot H. 2011. Diatomeen im Süßwasser-Benthos von Mitteleuropa. A.R.G. Gantner, Ruggell. 908 pp Morphology; Illustrations;
This page should be cited as:

Jüttner I. Achnanthidium subatomus (Hustedt) H. Lange-Bertalot; 1999; 279 (273). In: Jüttner I., Bennion H., Carter C., Cox E.J., Ector L., Flower R., Jones V., Kelly M.G., Mann D.G., Sayer C., Turner J. A., Williams D.M.. Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=4173. [Accessed:  ].

Image Gallery

Record last modified: 27/12/2020