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Genus Mastogloia Thwaites ex W. Smith (1856)
W, Smith 1856, Syn. Brit. Diat. 2: 63.

Cells solitary or growing within mucilaginous masses. Live cells with two, lobed chloroplasts lying fore and aft in the cell, each with a central pyrenoid. Valves linear-lanceolate to elliptical, with slightly protracted, bluntly rounded apices. Raphe fissure central, undulate, extending to apices. Striae uniseriate or occasionally biseriate, transverse, comprised of coarse pores. Valvocopulae loculate (chambered), girdle bands perforated by one or two rows of pores.

Species in Mastogloia


Mastogloia elliptica (Agardh) Cleve in Schmidt et al. (1893)
Schmidt's Atlas: 185/24-25.

Valve view brightfield focussed on partecta

Valves linear lanceolate to lanceolate, sometimes with very slightly subrostrate, bluntly rounded apices. Raphe slit undulate in a broad axial area, curved over poles, central area rounded to transversely elliptical. Straie slightly radiate to parallel at the apices, distinctly porous. Valvocopulae with loculi (chambers) along each side. Valvocopulae may remain associated with valves or be found separately.


Mastogloia smithii Thwaites in W. Smith (1856)
Syn. Brit. Diat. 2: 65

Valve view brightfield partecta

Valves lanceoalte with bluntly rostrate apices. Raphe slit undulate, in a narrow axial area, widening to a transversely rectangular central area. Striae slightly radiate throughout, comprised of fine, regular pores. Valvocopula with loculi (chambers).


Mastogloia spp. Thwaites ex W. Smith (1856)
W, Smith 1856, Syn. Brit. Diat. 2: 63.

valve view DIC M. danseii

Comments to: Diatom Key Development Team