Hoogenraadia sylvatica Vucetich, 1973

Diagnosis: Shell ovoid; pseudostome with a highly developed visor. In ventral view, the visor completely conceals the aperture and forms a sinuous line that extends to both sides of the test. The region between the lower edge of the visor and its lateral extensions is slightly concave. The pseudostome can be seen only by placing the test in lateral position and somewhat tilted toward the region of the visor. The test is quite transparent, and yellowish-brown, embedded in a hyaline cement with exogenous mineral particles larger in the body than in the visor.

Dimensions: According to Vucetich (1973): Shell length 82—93 µm; width: 60—70 µm; depth 58—68 µm.

Ecology: Jungle soil.

Geographical distribution: Argentina, Punta Lara.

Remarks: The Argentine species, according to its morphology, is closest to H. cryptostoma, which is distinguished by the more pronounced cryptostome, the concavity in the ventral region and a smaller size (approximately 1/2 the size of H. cryptostoma).