Achnanthidium reimeri

(Camburn) Ponader and Potapova 2007      Category: Monoraphid
BASIONYM: Achnanthes reimeri Camburn 1978

Achnanthidium pyrenaicum


Achnanthidium rivulare

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - May 2009
Length Range: 12-18 µm
Width Range: 3.5-4.5 µm
Striae in 10 µm: 26-29 in the center valve


Valve linear-elliptical to linear-lanceolate with subrostrate or subcapitate ends. Raphe valve concave with narrow axial area; central area rectangular or elliptical, transversely expanded. Terminal raphe fissures externally hooked towards the same side of the valve. Central raphe endings are not expanded. Rapheless valve with narrow linear axial area and rhomboid central area. Striae radiate in the middle, becoming parallel toward the ends of the valves. Striae density 26-29 in 10 µm in the middle and 38-44 in 10 µm at the apices of the valves. External openings of areoolae are small, circular or transapically elongated. Each stria in the middle part of the valve contains 7-8 areolae. Striae bordering central area are of the irregular length.

Original Description

Basionym: Achnanthes reimeri
Author: Camburn 1978
Length Range: 10-18 µm
Width Range: 3.5-5.5 µm
Striae in 10 µm: 23-26

Original Description

Valve linear-elliptical to linear-lanceolate with subrostrate to rostrate apices. Raphe valve with narrow, linear axila area. Central area transversely expanded, rectangular, irregularily bordered at the valve margin by a few shortened striae. Raphe filiform. broadening slightly toward the bulbous central pores; terminal fissures indistinct but appearing unilaterally deflected. Rapheless valve with narrow, linear axial area which abruptly flares at the central area. central area a small oval to transversely expanded, rectangular. Straie radiate, becoming more numerous and almost parallel toward apices, 23-26 in 10 um at the center to 30 in 10 mm near the apices on both valves. Length, 10-18 um; Breadth, 3.5-5.5 um.

Original Images

Original text and images reproduced with permission by Schweizerbart.

Cite This Page:
Potapova, M. (2009). Achnanthidium reimeri. In Diatoms of the United States. Retrieved April 26, 2018, from

Species: Achnanthidium reimeri

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


Camburn, K.E., Lowe, R.L., and Stoneburner, D.L. (1978). The haptobenthic diatom flora of Long Branch Creek, South Carolina. Nova Hedwigia 30: 149-279.

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.

Ponader, K. and Potapova, M. (2007). Diatoms from the genus Achnanthidium in flowing waters of the Appalachian Mountains (North America): Ecology, distribution and taxonomic notes. Limnologica - Ecology and Management of Inland Waters 37: 227-241 . 10.1016/j.limno.2007.01.004

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Achnanthidium reimeri CAS

NCBI Genbank Taxonomy

Achnanthidium reimeri NCBI

North American Diatom Ecological Database (NADED)

NADED ID: 1050

Autecology Discussion

Achnanthidium reimeri has been reported from South Carolina (Camburn et al. 1978) and from the Great Smoky Mountains National Park in North Carolina and Tennessee (Johansen et al. 2004). Achnanthidium reimeri was found in silty rivers of relatively low nutrient and ionic content (Ponader and Potapova 2007).