Platessa lutheri

(Hustedt) Potapova 2012      Category: Monoraphid
BASIONYM: Achnanthes lutheri Hustedt 1933

Platessa kingstonii


Platessa stewartii

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - January 2012
Length Range: 8-17 µm
Width Range: 4.5-6.0 µm
Striae in 10 µm: 25–29 on raphe valve, 12–15 on rapheless valve


Valves are elliptic. The raphe valve has a narrow linear axial area and a wide, bow-tie-shaped central area. The raphe is straight, filiform, without terminal fissures, and with external distal ends slightly expanded into drop-like pores. The external proximal raphe ends are straight, and positioned within a shallow groove. There are helictoglossae at the internal distal raphe ends. The striae on the raphe valve are uniseriate, and strongly radiate. The rapheless valve has a wide lanceolate axial area bordered by short and broad biseriate striae. The internal openings of areolae on both valves are round.

Original Description

Basionym: Achnanthes lutheri
Author: Hustedt 1933
Length Range: 9 µm
Width Range: 4.5 µm
Striae in 10 µm: 30 on raphe valve, 15–16 on rapheless valve

Original Description

Original Images

Cite This Page:
Potapova, M. (2012). Platessa lutheri. In Diatoms of the United States. Retrieved November 24, 2015, from

Species: Platessa lutheri

Contributor: Marina Potapova

Reviewer: Loren Bahls


Hustedt, F. (1933). Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. In: L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h. Leipzig, Vol. 7, Part 2, pp. 321-432.

Johansen, J.R., Lowe, R., Gomez, S.R., Kociolek, J.P. and Makosky, S.A. (2004). New algal species records for the Great Smoky Mountains National Park, U.S.A., with an annotated checklist of all reported algal species for the park. Archiv für Hydrobiologie Supplement 150: 17-44.

Krammer, K. and Lange-Bertalot, H. (2004). Bacillariophyceae 4. Teil: Achnanthaceae, Kritische Erganzungen zu Navicula (Lineolatae), Gomphonema Gesamtliteraturverzeichnis Teil 1-4 [second revised edition]. In: H. Ettl et al., Suesswasserflora von Mitteleuropa. Spektrum Akademischer Verlad Heidelberg, 468 pp.

Potapova, M. (2012). New species and combinations in monoraphid diatoms (Family Achnanthidiaceae) from North America. Diatom Research 27(1): 29-42. doi:10.1080/0269249X.2011.644636

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)


Autecology Discussion

Platessa lutheri has been reported from oligotrophic circumneutral waters and aerial habitats of Europe and North America (Krammer & Lange-Bertalot 2004). This species is rare in the US: it was found by Johasen et al. (2004) in the Great Smoky Mountain National Park and there is one record in the ANSP databases from the Murderkill River, Delaware.