Platessa oblongella (Østrup) C.E.Wetzel, Lange-Bertalot & Ector; 2017; 213
Synonymy
Achnanthes oblongella Østrup 1903
Karayevia oblongella (Østrup) Aboal in Aboal, Álvarez-Cobelas, Cambra & Ector 2003; 159
Key references
Wetzel C.E., Lange-Bertalot H., Ector E. 2017. Type analysis of Achnanthes oblongella Østrup and resurrection of Achnanthes saxonica Krasske (Bacillariophyta). Nova Hedwigia Beiheft. 146: 209-227.
Morphology
Shape
Valves elliptic.
Symmetry
Isopolar, bilaterally symmetrical, heterovalvar.
Striae
Radiate, fine on the raphe valve, coarse on the rapheless valve, shortened striae can be present throughout on the rapheless valve.
Axial area
Narrow, linear on the raphe valve, wider (variable width) and sometimes irregular on the rapheless valve.
Central area
Acute-angeled sub-fascia on the raphe valve, indistinct on the rapheless valve.
Raphe
Straight with expanded drop-shaped distal ends; proximal ends appear expanded because they are located in a drop-shaped depression, they have small lateral ribs (SEM).
SEM morphology
Uniseriate striae on the raphe valve with round external areola openings. A hyaline area along the valve margin separates the striae on the valve face from a single row of areolae on the shallow valve mantle.
Uni- to biseriate striae on the rapheless valve with irregular-shaped apically extended external areola openings when uniseriate.
Areolae occluded by cribra.
Valves elliptic.
Symmetry
Isopolar, bilaterally symmetrical, heterovalvar.
Striae
Radiate, fine on the raphe valve, coarse on the rapheless valve, shortened striae can be present throughout on the rapheless valve.
Axial area
Narrow, linear on the raphe valve, wider (variable width) and sometimes irregular on the rapheless valve.
Central area
Acute-angeled sub-fascia on the raphe valve, indistinct on the rapheless valve.
Raphe
Straight with expanded drop-shaped distal ends; proximal ends appear expanded because they are located in a drop-shaped depression, they have small lateral ribs (SEM).
SEM morphology
Uniseriate striae on the raphe valve with round external areola openings. A hyaline area along the valve margin separates the striae on the valve face from a single row of areolae on the shallow valve mantle.
Uni- to biseriate striae on the rapheless valve with irregular-shaped apically extended external areola openings when uniseriate.
Areolae occluded by cribra.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Østrup E. 1902. Freshwater Diatoms [in Flora of Koh Chang. Part VII. Contributions to the knowledge of the gulf of Siam.John Schmidt (ed.). Preliminary Rept. Bot., Results Dan. Exped. to Siam (1899-1900)]. Botanisk Tidsskrift. 25(1): 28-41. | Description; Illustrations; Morphology |
| Carter J.R. 1970. Observations of some British forms of Achnanthes saxonica Krasske. Microscopy. 31: 313-316. | Morphology; Illustrations |
| Aboal M., Alvarez-Cobelas M. , Cambra J., Ector L. 2003. Floristic List of the non marine diatoms (Bacillariophyceae) of Iberian Peninsula, Balearic Islands and Canary Islands. A.R.G. Gantner, Ruggell. | Morphology; Taxonomy |
| Hofmann G., Werum M., Lange-Bertalot H. 2011. Diatomeen im Süßwasser-Benthos von Mitteleuropa. A.R.G. Gantner, Ruggell. 908 pp | Illustrations; Ecology; Morphology |
| Juggins S., Kelly M., Allot T., Kelly-Quinn M., Monteith D. 2016. A Water Framework-Directive-compatible metric for assessing acidification in UK and Irish rivers using diatoms. Science of the Total Environment. 568: 671-678. | Ecology |
| Wetzel C.E., Lange-Bertalot H., Ector E. 2017. Type analysis of Achnanthes oblongella Østrup and resurrection of Achnanthes saxonica Krasske (Bacillariophyta). Nova Hedwigia Beiheft. 146: 209-227. | Type Illustration; Morphology; Taxonomy |
Similar Species
Similar species not published on this website:
This page should be cited as:
Jüttner I. Platessa oblongella (Østrup) C.E.Wetzel, Lange-Bertalot & Ector; 2017; 213. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., 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=2374. [Accessed:
].
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Record last modified: 27/12/2020