Brandt, 1906
Diagnosis
Lorica narrow and conical. Oral rim channeled. Aboral horn or pedicel with knob or skirt, and lance at terminal end. Two well-developed laminae (see remarks for genus Xystonellopsis).
Arranged in Subgroup 4G (see the page Ti. 15 Classification scheme based on morphologically similar groups of species).
Species treated:
Xystonella longicauda (Brandt, 1906)
Xystonella treforti (Daday, 1887)