Identification

Individual cells of Ardissonea fulgens var. gigantea (Lobarzewsky) De Toni has the general shape of a Toxarium in valve view but a striae pattern similar to Ardissonea fulgens. Unlike the nominate variety, which is also common in Guam, var. gigantea forms distinctive flat fans in which the cells, adjacent by their valve faces, become more and more curved because of central area is wider than the apices, splitting apart when there are about 6-10 cells. The colony appears curved but is actually flat; the cells are curved in the plan of the colony.

Refs: Peragallo & Peragallo Plate LXXIX, fig. 6; Hustedt/Jensen Fig. 717b, c (both as Synedra fulgens var. gigantea).

Projects This is Associated With

Western Pacific Diatoms Project

Last Updated

Added by Chris Lobban on July 6, 2009, 5:14 pm
Last edited by Chris Lobban on September 20, 2009, 6:44 am

Photos

Ardissonea fulgens gigantea

Ardissonea fulgens gigantea

Ardi. fulgens gigantea center and pole, LM