Gomphonema turgidum

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

Gomphonema truncatum

 

Gomphonema variostriatum

LM scalebar = 10 µm = 40 pixels.



Observations

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

Description

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

Basionym:
Author: Ehrenberg 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 October 19, 2017, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_turgidum

Species: Gomphonema turgidum

Contributor: Ian Bishop

Reviewer: Marina Potapova

Citations

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