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Eunotia charliereimeri

Edlund and L.A.Brant 2010      Category: Eunotioid

Eunotia cataractarum


Eunotia diadema

LM scalebar = 10 µm = 40 pixels.


Contributor: Mark Edlund | David R.L. Burge | Lynn Brant - June 2017
Length Range: 23-72 µm
Width Range: 4.9-6.7 µm
Striae in 10 µm: 16.7-20.8


Frustules lanceolate in girdle view because of amphoroid symmetry. Valves strongly arcuate with convex dorsal and concave ventral margins; margins parallel in larger valves, more dorsally arched in smaller valves. Ends slightly protracted in longer valves, acutely rounded in shorter valves. Small but distinct helictoglossae located subterminally along ventral margin. Two rimoportulae per valve, located at each valve end. Striae parallel, slightly finer density at valve ends.

Original Description

Author: Edlund and L.A.Brant 2010
Length Range: 23.5-71.4 µm
Width Range: 4.9-6.7 µm
Striae in 10 µm: 17-20.8

Original Description

Frustules sublanceolate in girdle view with truncate ends. Valve lunate or arcuate, with strongly convex dorsal margin and concave ventral margin, 4.9-6.7 μm wide, 23.5-71.4(84.0?) μm long. Apices of valve acute or rounded, narrowing to slightly attenuated ends. Short terminal raphe nodules are distinct on the ventral margin and slightly removed from the apices. Two rimoportulae per valve, one rimoportula at each valve end. Striae are fine and parallel, 17.0-20.8 in 10 μm, and somewhat finer at the valve ends.

Original Images

Cite This Page:
Edlund, M., Burge, D., and Brant, L. (2017). Eunotia charliereimeri. In Diatoms of the United States. Retrieved May 25, 2018, from

Species: Eunotia charliereimeri

Contributor: Mark Edlund | David R.L. Burge | Lynn Brant

Reviewer: Evelyn Gaiser


Edlund, M.B. and Brant, L.A. (2010). Eunotia charliereimeri, a new Eunotia species (Bacillariophyceae) with amphoroid frustule symmetry. Proceedings of the Academy of Natural Sciences of Philadelphia 160(1):47-56. 10.1635/053.160.0106

Gaiser, E.E. and Johansen, J. (2000). Freshwater diatoms from Carolina bays and other isolated wetlands on the Atlantic Coastal Plain of South Carolina, USA, with descriptions of seven taxa new to science. Diatom Research 15(1): 75-130. 10.1080/0269249X.2000.9705487

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Eunotia charliereimeri CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Eunotia charliereimeri is currently known only from its type locality, Bear Meadows Bog in Pennsylvania. Bear Meadows is classified as a poor fen and its open wetland is dominated by Sphagnum, sedges, swamp laurel (Kalmia polifolia), blueberry (Vaccinium spp.), and sundews (Drosera rotundifolia). The woody plants Rhododendron (spp.), alder (Alnus spp.), Spiraea (spp.), and mountain holly (Nemopanthus mucronatus) form the border between the open wetland and surrounding forest. L.B. has measured water chemistry in the bog for many years with pH values as low as 4.0 and as high as 5.0, and electrical conductivity measurements from 19 to 38 µS (Orion Model 24). Diatom taxa found with E. charliereimeri in Bear Meadows Bog include E. tauntoniensis, E. flexuosa, E. curvata, E. naegelii, E. paludosa var. trinacria, E. serra, Fragilariforma constricta, Frustulia rhomboides var. saxonica, Pinnularia subcapitata, P. hilseana, P. abaujensis, Stenopterobia delicatissima, Aulacoseira spp., and Neidium spp.


Bear Meadows Bog, Pennsylvania.

Credit/Source: Lynn Brant