Rossithidium anastasiae

(Kaczmarska) Potapova 2012      Category: Monoraphid
BASIONYM: Achnanthes anastasiae Kaczmarska 1985

REPORTED AS: Achnanthes lineariformis (Lange-Bertalot 1993) | Achnanthes linearioides (Lange-Bertalot in Lange-Bertalot and Moser 1994) | Achnanthes linearis (Germain 1981) 

Rhopalodia musculus


Rossithidium nodosum

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - December 2011
Length Range: 12-26 µm
Width Range: 3.7-4.5 µm
Striae in 10 µm: 24-29


Valves are linear or linear-elliptic with rounded ends. The raphe valve has a linear axial area that gradually widens into a small or almost indistinct central area. The raphe is straight, filiform, and lacks terminal fissures. Internally, the central raphe endings are curved to opposite sides. The rapheless valve has a narrow, linear axial area and no distinct central area. Striae are uniseriate and slightly radiate. Each stria in the middle part of the valve contains 5-6 areolae on valve face. The valve mantle bears one row of areolae.

Original Description

Basionym: Achnanthes anastasiae
Author: Kaczmarska 1985
Length Range: 17-25 µm
Width Range: 4-5 µm
Striae in 10 µm: 24–26 on the raphe valve, 22–25 on the rapheless valve

Original Description

Original Images

Cite This Page:
Potapova, M. (2011). Rossithidium anastasiae. In Diatoms of the United States. Retrieved April 19, 2018, from

Species: Rossithidium anastasiae

Contributor: Marina Potapova

Reviewer: Loren Bahls


Hofmann, G., Werum, M. and Lange-Bertalot, H. (2011). Diatomeen im Süßwasser-Benthos von Mitteleuropa. Koeltz Scientific Books, Königstein, 908 pp.

Kaczmarska, I. (1985). The diatom flora of Miocene lacustrine diatomites from the Harper Basin, Oregon, U.S.A. Acta Palaeobotanica 25(1-2):33-100.

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.

Mölder, K. and Tynni, R. (1972). Uber Finnlands rezente und subfossile Diatomeen VI. Bulletin of the Geological Society of Finland 44: 141–159.

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)

Transfer INA

California Academy of Sciences (CAS)

NCBI Genbank Taxonomy

Rossithidium anastasiae NCBI

North American Diatom Ecological Database (NADED)


Autecology Discussion

Rossithidium anastasiae is a widely distributed diatom, often found in colder waters in Europe (Mölder & Tynni 1972, Krammer & Lange-Bertalot 2004) and in North America. Considering that most records of R. linearis are in fact R. anastasiae, data in the ANSP databases and catalogues show that this species is often found in low-conductivity lakes and sometimes streams of the northeastern USA, and, occasionally, in the Rocky Mountains. Hofmann et al. (2011) stated that this diatom is mostly found in oligo- to mesotrophic waters of low conductivity.