Pseudostaurosira pseudoconstruens

(Marciniak) Williams and Round 1987      Category: Araphid
BASIONYM: Fragilaria pseudoconstruens Marciniak 1982

Pseudostaurosira parasitica


Pseudostaurosira robusta

LM scalebar = 10 µm = 80 pixels.


Contributor: Thomas C. Smith - June 2013
Length Range: 8-16 µm
Width Range: 3.5-7 µm
Striae in 10 µm: 8.5 near the center increasing to 18 at the apices


Valves are cruciform, with a round to rhombic inflation and broadly rounded rostrate to slightly capitate apices. In girdle view, valves are rectangular and the central inflation is distinct. The axial area may be wide in the valve center, to relatively narrow. Striae are mostly restricted to the margins and never meet in the central area. The central striae are longer than distal striae. The central striae are parallel to slightly radiate and often appear wider at the margin than proximally. The distal striae are short and parallel. Striae are uniseriate, with round to elliptical areolae.

This species was described from Holocene lake sediments in Poland (Marciniak, 1982).

Original Description

Basionym: Fragilaria pseudoconstruens
Author: Marciniak 1982
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Smith, T. (2013). Pseudostaurosira pseudoconstruens. In Diatoms of the United States. Retrieved September 29, 2016, from

Species: Pseudostaurosira pseudoconstruens

Contributor: Thomas C. Smith

Reviewer: Eduardo Morales


Marciniak, B. (1982). Late Glacial and Holocene new diatoms from a glacial Lake Przedni Staw in the Przedni Stawów Polskich Valley, Polish Tatra Mts. Acta Geol. Acad. Sci. Hung. 25: 161-171.

Marciniak, B. (1988). Late glacial Fragilaria flora from lake sediments of the Tatra Mts. and the Alps. Proceedings of the Ninth International Diatom Symposium, (F.E. Round, ed) Biopress, Bristol.

Williams, D.M. and Round, F.E. (1987). Revision of the genus Fragilaria. Diatom Research 2: 267-288.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

Pseudostaurosira pseudoconstruens CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion