Pinnularia turfosiphila

E.E.Gaiser and J.R.Johansen 2000      Category: Symmetrical biraphid

Pinnularia suchlandtii


Placoneis abiskoensis

LM scalebar = 10 µm = 40 pixels.


Contributor: David R.L. Burge | Lynn Brant | Mark Edlund - July 2016
Length Range: 67-96 µm
Width Range: 14-18 µm
Striae in 10 µm: 10-12


Valves are linear-lanceolate, with acutely rounded, tapered apices. The central area is elliptic and asymmetric about the apical axis. A fascia is absent. The striae are radiate at the valve center and become convergent at the apices. A Voight discontinuity is often present. The striae continue around the apices and the apical hyaline area. The raphe is lateral and the position of the raphe within the axial area is eccentric. The axial area narrows toward the apices. The distal raphe ends are curved, bayonet-shaped, and continue onto the mantle at the valve apices. A hyaline area surrounds the distal raphe ends. The external proximal raphe ends are slightly expanded into a teardrop shape. The internal proximal raphe ends form a short 90 degree hook.

Original Description

Author: E.E.Gaiser and J.R.Johansen 2000
Length Range: 65-92 µm
Width Range: 10-13 µm
Striae in 10 µm: 9-13

Original Description

Valve linear with parallel or slightly swollen sides, tapering to somewhat acute ends, 10-13 µm wide, 65-92 µm long. Axial area broad, about 1/4 to 1/3 breadth of valve. Central area round to elliptical, usually longer (6-8 µm) than broad (3-4 µm), without a transverse fascia. Raphe filamentous with bayonet-shaped terminal fissures. Terminal nodules large. Striae short and radiate in the center of valve, becoming convergent at ends. Striae 9-13 in 10 µm (mean 10.8) at valve center, becoming coarser, 8-10 in 10 µm (mean 8.5), at ends.

Original Images

Cite This Page:
Burge, D., Brant, L., and Edlund, M. (2016). Pinnularia turfosiphila. In Diatoms of the United States. Retrieved April 20, 2018, from

Species: Pinnularia turfosiphila

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

Reviewer: Sylvia Lee


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

Siver, P.A. and Hamilton, P.B. (2011). Diatoms of North America: The Freshwater Flora of Waterbodies on the Atlantic Coastal Plain. Iconographia Diatomologica 22.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Pinnularia turfosiphila CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

Pinnularia turfosiphila has been reported from the eastern United States, in benthic habitats of low pH lakes (Gaiser and Johansen 2000, Siver and Hamilton 2011) and from Bear Meadows Bog, a low specific conductance, low pH wetland in Pennsylvania (Edlund and Brant 2010).


Bear Meadows Bog

Credit/Source: Lynn Brant