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This paper describes the morphology of two new species of  Mastogloia  identified during a survey of the marine benthic diatom flora of Guam.  Mastogloia parlibellioides  sp. nov., classified in the section Decussatae, is distinctive in the combination of its valve shape and stria pattern reminiscent of  Parlibellus , as well as the presence of rudimentary division walls extending from the free margin to the middle of each partectum.  Mastogloia lyra  sp. nov., classified in the section Sulcatae, subgroup 2, has internal lyre-shaped lateral sterna and partecta that are displaced toward the midline of the valve by a siliceous flange, which shows oblique partectal ducts. The descriptions of these two new species increase the knowledge base of biodiversity in a Pacific Ocean  Mastogloia  hotspot.

Two new Mastogloia species (Bacillariophyceae), M . parlibellioides and M . lyra , from coral reefs in Guam, Western Pacific 1