Gomphoneis trullata

Kociolek and Stoermer 1986      Category: Asymmetrical biraphid

Gomphoneis septa


Gomphonema acuminatum

LM scalebar = 10 µm = 40 pixels.


Contributor: Pat Kociolek - February 2011
Length Range: 30-85 µm
Width Range: 11-15 µm
Striae in 10 µm: 10-14


Valves lanceolate-trullate, tapering to a rounded to obtuse headpole, and more abruptly to the rounded footpole. Valves broadest below the central nodule. Striae are radiate, strongly so at the apices, more coarse around the center and more dense at the apices. Striae are biseraite. The axial area is narrow, broadening slightly to form a linear central area. One stigma, sometimes accompanied by a second stigma or isolated punctum, occur in the central area. Raphe is lateral and distinctly undulate. Longitudinal lines are submarginal in larger specimens, positioned about ½ the way between the margin and axial area in smaller specimens. Septa are very large at the headpole. Septa and pseudosepta are present at both poles.

Original Description

Author: Kociolek and Stoermer 1986
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Gomphoneis trullata. In Diatoms of the United States. Retrieved April 23, 2018, from http://westerndiatoms.colorado.edu/taxa/species/gomphoneis_trullata

Species: Gomphoneis trullata

Contributor: Pat Kociolek

Reviewer: Rex Lowe


Kociolek, J.P. and Stoermer, E.F. (1986). Observations on North American Gomphoneis (Bacillariophyceae). II. Descriptions and ultrastructure of two new species. Transactions of the American Microscopical Society 105: 141-151 . http://www.jstor.org/stable/3226386

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphoneis trullata CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion