Thwaites in W.Smith 1856      Category: Symmetrical biraphid
TYPE SPECIES: Mastogloia dansei (Thwaites) Thwaites in W.Smith




Image Credit: Pat Kociolek, Loren Bahls

CLASS: Bacillariophyceae
  ORDER: Naviculales
    FAMILY: Mastogloiaceae

  1. Valves elliptic to lanceolate, with rounded to capitate ends
  2. Valvocopula with partecta
  3. Striae punctate

The valves of Mastogloia are elliptic to elliptic-lanceolate or lanceolate, with rounded to capitate ends. The valvocopula (first girdle band) each possess complex silica chambers, called partecta, that function to secrete strands of mucilage. The raphe is straight or undulate. The axial area is narrow, with a slightly expanded central area. Living cells have two plastids.

Mastogloia is primarily a marine genus. A few species are found in inland waters, typically in benthic habitats. The genus appears to be closely related to Aneumastus, based on a similar, but less complex, valvocopula.

Cite This Page:
Spaulding, S., and Edlund, M. (2008). Mastogloia. In Diatoms of the United States. Retrieved April 24, 2018, from

Contributor: Sarah Spaulding | Mark Edlund - December 2008
Reviewer: Sam Rushforth - June 2010