Gomphonema elongatum

W. Smith 1855      Category: Asymmetrical biraphid
BASIONYM: Gomphonema elongatum W. Smith 1855
SYNONYM(S): Gomphonema  acuminatum var. elongatum  (W. Smith) Carruthers 1864 

Gomphonema distans


Gomphonema johnsonii

LM scalebar = 10 µm = 40 pixels.


Contributor: Pat Kociolek - September 2011
Length Range: 40-105 µm
Width Range: 7-11 µm
Striae in 10 µm: 13-15


Valves acuminate-apiculate. The apex is protracted and blunt with a weakly expanded headpole. The central portion of the valve is tumid. The axial area is straight and wider at the apices than at the central valve. The central area is transversely widened, formed by two (one on each side) shortened central striae, and on one side is positioned a single isolated stigma. The punctate striae are radiate about the center, becoming parallel towards the ends, then becoming radiate at the headpole and footpole. The striae at the central valve are more widely spaced than the rest of the striae.

Original Description

Basionym: Gomphonema elongatum
Author: W. Smith 1855
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Gomphonema elongatum . In Diatoms of the United States. Retrieved August 23, 2016, from http://westerndiatoms.colorado.edu/taxa/species/gomphonema_elongatum

Species: Gomphonema elongatum

Contributor: Pat Kociolek

Reviewer: Rex Lowe


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.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Gomphonema elongatum CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion