Conicocassis pontigulasiformis (Beyens et al., 1986) Nasser and Anderson, 2015
Basionym: Centropyxis pontigulasiformis Beyens, Chardez and De Bock, 1986

Diagnosis:  Shell formed of two distinct parts: a perfectly spherical chamber and a large semi-circular visor. The chamber has a small circular aperture. The shell wall is composed of an organic matrix, incorporating fine plate-like polymorphous mineral particles. The visor which expands fan-like above and around the aperture, is mostly embossed with more voluminous quartz particles, in particular at the rim. Seen from an apertural view, this visor is as large as the shell body.

Dimensions: Beyens et al.(1968): Length 82-90 µm, shell diameter 58-62 µm, length of the visor 24-28 µm (n=5); diam. of aperture 8-10 µm.
Chardez (1990): Length 76-86 µm, shell diameter 26-30 µm, pseudostome 8-10 µm, visor 26-30 µm (n=6).
My observations of material from Mongolia (2023): Length 53-84 µm (mean 64 µm), shell diameter 29-49 µm (mean 38 µm), diam. of visor 28-46 µm (mean 35 µm)  (n=31). Diameter of aperture 8×13 µm (n=1).

Habitat: Mosses and Sphagnum. Canadian and European (Svalbard) arctic, Northern Sweden (Chardez, 1990); fen, Mongolia (my records).