Sphenoderia splendida Playfair, 1917

Diagnosis: shell in side-view ovoid, not compressed, in cross-section circular; plate scales elliptical. Pseudostome a narrow slit, surrounded by a thin hyaline collar.

Dimensions: length 30-70 µm.

Habitat: in wet Sphagnum and other mosses. Also in detritus without Sphagnum-contact.

Remarks: Decloitre (1965) described following variety and form:

Sphenoderia splendida var. magna Decloitre, 1965
Distinguished from the main form by its size; it is always more than 70 µm long, often 80 µm or more. This is nearly twice the length of the main form.
Iceland, Van Oye (1949).

Sphenoderia splendida forma stenostoma Decloitre, 1965
Description of the form: This form is distinguished from the main form by its extremely narrow pseudostome. The dimensions are: length 40-45 µm, width 20-23 µm, pseudostome 5-6 µm.
Iceland: Van Oye (1949).