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The World of Protozoa, Rotifera, Nematoda and Oligochaeta

Xystonella

Xystonella Brandt, 1907

[ref. ID; 3597]
Lorica elongate chalice-shaped; oral margin forming a channel between double rims, the inner entire, usually erect, the outer entire or denticulate, flaring; bowl subcylindrical or more or less conical, aborally abruptly narrowing to a slender pedicel with or without a knob and a lance; wall trilamellate, showing a regular polygonal reticulation. (ref. ID; 3597)
Type species; Xystonella treforti (Daday) Laackmann (ref. ID; 3597)
  1. Xystonella lanceolata (ref. ID; 3319)
  2. Xystonella lohmanni (ref. ID; 3319)
  3. Xystonella longicauda (ref. ID; 4464)
  4. Xystonella longicaudata (ref. ID; 3319)
  5. Xystonella minuscula Kofoid & Campbell (ref. ID; 3597)
  6. Xystonella paradoxa (ref. ID; 3319)
  7. Xystonella treforti (Daday) Laackmann (ref. ID; 3597)

Xystonella treforti (Daday) Laackmann (ref. ID; 3597)

Descriptions

Lorica elongate chalice-shaped, 4.60-5.65 outer oral diameters in length; outer oral margin flaring (33-45 degrees), minutely dentate, 1.20-1.25 inner oral diameters; bowl subcylindrical or conical (5 degrees), sometimes very slightly bulging below its middle, convex conical in the aboral region (30-40 degrees); pedicel tapering (6-9 degrees), provided with a knob and an apical lance, about 0.25 of the total length without a lance; knob conical, skirted with an acute edge; lance 0.07-0.10 of the total length, pointed at its tip; reticulation of the wall regularly hexagonal, most coarse near the middle of the bowl. (ref. ID; 3597)

Comments

The species differs from X. minuscula Kofoid & Campbell in having an elongate bowl instead of a short conical one. (ref. ID; 3597)

Measurements

Length 325-424; outer oral diameter 75 um. (ref. ID; 3597)