Diagnosis of the new genus long ellipsoid Amphisiellidae (? ) with one left and one right marginal row each, which are connected posteriorly; frontoterminal, transverse and ventral rows derived from “ numerous” FVT- anlagen; frontal and buccal cirri present, transverse cirri extremely developed, no typical mid-ventral rows.

Type species Pseudoamphisiella lacazei (Maupas, 1883) nov. comb.

Remarks Pseudoamphisiella nov. gen. differs from the other morphologically “related” genera in the unique origin of the ventral ciliature, the connected marginal rows and highly developed transverse cirri.

The morphology and infraciliature of this species, after reinvestigation performed by the author, suggest that the new combination is justified. It is distinguished with the following characters: large marine form in viva 200 - 300 × 70 – 100 μm with numerous short- bar- shaped subpellicular extrusomes. 50 – 60 macronucleus- segments; about 11 dorsal kineties and 66 - 73 marginal cirri; ca. 20 transverse cirri which extend onto the anterior 1/2 of the body. One frontoterminal and one ventral row, each with 14 - 16 and 16 - 21 cirri separately. Each of the obliquely arranged ventral cirri oriented (characteristically!) in an upper-right-to-down-left direction.