Diagnosis: Test ovoid, both in lateral en ventral view, with widest part closer to the apertural end than to the fundus. The width is about 2/3 of the length of the test. The pseudostome is surmounted by a visor that is about 10 µm long counted from the base of the invagination. The aperture is elongated oval. The test seen in lateral view, according to whether it is examined in a right or left position, takes the form of the number 6. In cross-section the test is more or less round. The test is chitinoid, brownish yellow, embedded with siliceous platelets, darker on the visor.
Dimensions: Length 62.5-65.3 (mean 64.0); width 44.0-48.8 µm (mean 46.4); height 41.7-45.3 (mean 43.0); aperture 16.4-23.1 X 6.0-6.1 µm (n=4).
Habitat and distribution: upper layer of a moorland, in debris, Bert Bospad, the Netherlands.
Remarks: This is a relatively small species, compared with the other members of this group. H. humicola and H. cryptostoma are twice its length and only H. ovata is of the same size.