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Scoliopleura peisonis

Grunow 1860      Category: Symmetrical biraphid

Rossithidium pusillum


Sellaphora alastos

LM scalebar = 10 µm = 40 pixels.


Contributor: Loren Bahls - January 2017
Length Range: 44-85 µm
Width Range: 11.9-19.7 µm
Striae in 10 µm: 15-16


Valves are arched and elliptic-lanceolate to linear-lanceolate with cuneate apices. Valves are slightly torqued or twisted. A longitudinal canal is present on each side of the raphe. Proximal raphe ends are hooked in opposite directions. Distal raphe ends are indistinct in these specimens. Striae are nearly parallel and often appear to run diagonally across the valve face. Striae are uniseriate and composed of rather coarse areolae that number 20-22 in 10 µm.

Scoliopleura peisonis is closely related to Muelleria (Spaulding et al. 1999).

Cite This Page:
Bahls, L. (2017). Scoliopleura peisonis. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Scoliopleura peisonis

Contributor: Loren Bahls

Reviewer: Sarah Spaulding


Grunow, A. (1860). Uber neue oder ungenügend gekannte Algen. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wein, 10: 503-582.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Spaulding, S.A., Kociolek, J.P. and Wong, D. (1999). A taxonomic and systematic revision of the genus Muelleria (Bacillariophyta). Phycologia 38: 314-341.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

NCBI Genbank Taxonomy

Scoliopleura peisonis NCBI

North American Diatom Ecological Database (NADED)


Autecology Discussion

Specimens of S. peisonis pictured on this website are from Brush Lake, a deep clear lake in the prairie pothole region of northeastern Montana (photos below). On the date of collection, Brush Lake had the following water quality characteristics: conductivity = 5760 µmhos/cm; pH = 9.30; total alkalinity = 1350 mg/L CaCO3; total hardness = 1168 mg/L equivalent CaCO3; Kjeldahl nitrogen = 1.3 mg/L; total phosphorus = 0.018 mg/L; dissolved oxygen = 7.50 mg/L; temperature = 18 C; CO3 = 1070 mg/l; SO4 = 2210 mg/L; Cl = 72.3 mg/L.

In Brush Lake, S. peisonis is part of a remarkable diatom association that includes Surirella crumena, Staurophora amphioxys and other brackish-water species that are typical of coastal waters and inland waters of higher conductivity. This taxon has been reported as “cosmopolitan in waters with high to very high electrolyte content” (Krammer & Lange-Bertalot 1986). It has also been reported from the Great Salt Lake, Utah (Patrick & Reimer 1966)


Brush Lake, Sheridan County, Montana: home of Scoliopleura peisonis.

Credit/Source: Montana Department of Fish, Wildlife & Parks

Brush Lake, Sheridan County, Montana: home of Scoliopleura peisonis.

Credit/Source: Doug Smith

Brush Lake, Sheridan County, Montana: home of Scoliopleura peisonis.

Credit/Source: Jim Rea, Montana Department of Fish, Wildlife & Parks