Tryblionella calida

(Grunow in Cleve and Grunow; Grunow in Van Heurck) Stroganov et al. 1927      Category: Nitzschioid
BASIONYM: Nitzschia calida Grunow in Cleve and Grunow; Grunow in Van Heurck

Tryblionella apiculata


Tryblionella gracilis

LM scalebar = 10 µm = 80 pixels.


Contributor: Pat Kociolek - September 2011
Length Range: 27-54 µm
Width Range: 8-10 µm
Striae in 10 µm: 30-32


Valves linear, slightly concave in the middle of the valve, apices narrow, drawn out and narrowly rounded. The keel is strongly excentric, with the central nodule formed by two fibulae more distant from the others along the keel. Fibulae 7-9 in 10 µm. A narrow, indistinct fold runs along the longitudinal axis of the valve. The fold is barely undulate or may even appear not to rise or taper from the main valve surface. Transapical ribs distinct, about 12-16 in 10 µm. Striae are indistinct, seen only with DIC or oblique light with brightfield microscopy.

Stroganov (1927) made the valid transfer of Nitzschia calida Grunow in Cleve &Grunow to Tryblionella before Mann in Round et al.(1990).

Original Description

Basionym: Nitzschia calida
Author: Grunow in Cleve and Grunow; Grunow in Van Heurck
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Kociolek, P. (2011). Tryblionella calida. In Diatoms of the United States. Retrieved September 25, 2016, from

Species: Tryblionella calida

Contributor: Pat Kociolek

Reviewer: Rex Lowe


Krammer, K. and Lange-Bertalot, H. (1988). Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/2. Gustav Fisher Verlag, Jena.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Tryblionella calida CAS

North American Diatom Ecological Database (NADED)

NADED ID: 185021

Autecology Discussion