Gomphonema turgidum

Ehrenb. 1854      Category: Asymmetrical biraphid
SYNONYM(S): Gomphonema truncatum var. turgidum (Ehrenb.) R.M.Patrick 1975 

Gomphonema truncatum


Gomphonema variostriatum

LM scalebar = 10 µm = 40 pixels.


Contributor: Ian Bishop - December 2015
Length Range: 30-49 µm
Width Range: 11.3-15.0 µm
Striae in 10 µm: 10-14


Valves are strongly asymmetric to the transapical axis, with a broad, truncated headpole, nearly as wide as the central inflation. The footpole is narrow and rounded, with a porefield bisected by the distal raphe. The axial area is wide and linear-lanceolate. The raphe is complex and lateral. The central area is small with central striae of variable length, and containing a single isolated stigma. Striae are parallel to weakly radiate, except at the footpole, where they become strongly radiate. Areolae are coarse and easily visible in LM, measuring 21-26 in 10 µm. Voigt discontinuities are often visible.

Original Description

Author: Ehrenb. 1854
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bishop, I. (2015). Gomphonema turgidum. In Diatoms of the United States. Retrieved April 21, 2018, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_turgidum

Species: Gomphonema turgidum

Contributor: Ian Bishop

Reviewer: Marina Potapova


Ehrenberg, C.G. (1854). Mikrogeologie. Einundvierzig Tafeln mit über viertausend grossentheils colorirten Figuren, Gezeichnet vom Verfasser. Voss, Leipzig., Pl. 5, II, fig. 23 (iconotype).

Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Reichardt, E. (2001). Revision der Arten um Gomphonema truncatum und G. capitatum. In Jahn R., Kociolek, J.P., Witkowski, A. and Compère, P. (Eds.). Lange-Bertalot-Festschrift, Studies on Diatoms. A.R.G. Gantnter Verlag K.G. Ruggell. pp. 187-224.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphonema turgidum CAS

North American Diatom Ecological Database (NADED)

NADED ID: 37346

Autecology Discussion