Heleopera lata Cash & Hopkinson, 1909

Diagnosis: Shell broadly ovoid, its vertical dimension exceeding but little the diameter in its broadest, part (immediately below the fundus); the fundus forming a wide semicircle and the lateral margins descending in straight lines downwards to the obtusely-angular corners of the aperture. Aperture proportionately broad; its outline slightly convex and structurally resembling very closely that of H. rosea, the lips, which are thin and closely approximated, having a yellowish or lightish-brown margin, well defined. Color of the test a deep vinous red, or purplish, and with a surfacing of amorphous scales, closely compacted, but not overlapping; the crown covered rather sparsely with variously-sized sand-grains. Plasma and pseudopodia not observed, but probably not differing from H.rosea.

Dimensions; Length 115 µm; breadth 100 µm; width of aperture 55 µm.

Habitat: In Sphagnum, Ireland (Hopkinson, 1909).

Remarks: Cash and Hopkinson, 1909: “H. lata is a large and handsome species, and may readily be distinguished from its congeners by the broadly-arched crown and straight lateral margins. We have examined a good many tests and find these characters to be constant. In color it closely resembles H. rosea, of which at first we took it to be a well-marked variety. Its frequent recurrence, however, in different localities, and slight tendency to vary, in any respect, justifies its receiving specific rank, though no living example has been met with.”