Fol, 1881 emend. Laackmann, 1910, emend. Jörgensen, 1924
Diagnosis
Bowl mostly conical, collar flaring as inverted truncate cone (suboral shelf), generally with nuchal constriction; oral rim sometimes denticulate. Whole lorica wall finely sculptured with polygonal reticulum.
Arranged in Subgroup 4F (see the page Ti. 15 Classification scheme based on morphologically similar groups of species).
Species treated:
Cyttarocylis cassis/plagiostoma-group