Trinema grandis (Chardez, 1960)
Diagnosis: shell ovoid, elongate and hyaline; ventral side in the same plane as the aperture, while the dorsal surface is convex and bulges; test composed of two types of scales: one type large, the other type small, covering the space between the large scales. Aperture oval or circular, sub-terminal and invaginated, bordered by an inner circle of denticulate apertural-plates.
Dimensions: 103 - 134 um long; my measurements: up to 155 µm (Ecuador)
Ecology: in mosses.
Remarks: Distinction between T. enchelys and this species only by their size.