Longinebela ampulla
Longinebela ampulla - from Todorov et al., 2018

 

 

Longinebela ampulla  Todorov, Bankov and Ganeva, 2018

 

Diagnosis: Shell colourless, elongated-cylindrical, with distinct short neck and rounded aboral region; laterally flattened only in the neck region; all remaining part of shell almost uncompressed laterally, with no lateral margins and lateral pores. Shell composed mainly of small oval, rarely circular shell plates, arranged regularly without overlapping. Shell plates embedded in thick layer of organic cement; their outer part appears to be covered with layer of cement, thus edges not clearly defined. Aperture oval, truncate but not convex and bordered by thin collar of organic cement.

 

Dimensions: Length 116–132 μm, breadth 43–51 µm, broadest diameter of aperture 21–26 µm.

 

Ecology: Wet Sphagnum. Type locality: Wet Sphagnum growing on a small mire in a mixed deciduous forest of beech and birch at 881 m. above sea level in the Western Stara Planina Mountains, Bulgaria.

 

Remarks: The main morphological differences between L. ampulla and L. penardiana are the following:

  1. Longinebela ampulla has an elongated cylindrical shell, with a distinct short neck, while the shell of L. penardiana is pyriform, tapering evenly from the swollen and rounded aboral region to the aperture;
  2. Longinebela ampulla is almost uncompressed laterally and is flattened in the region of the neck only, while L. penardiana is always laterally compressed;
  3. Longinebela ampulla has no lateral margins and lateral pores, which are characteristic and almost always well visible in L. penardiana;
  4. In broad view, the aperture of L. ampulla is not convex but rather truncate and this one of L. penardiana is usually convex and concave in lateral view;
  5. The shell of L. ampulla is composed mainly of small oval, rarely circular shell plates, embedded in a thick layer of organic cement, while the shell of L. penardiana is composed of larger and clearly defined plates, embedded in thin layer of organic cement.

 

Literature: Todorov, M., Bankov, N. and Ganeva, A., 2018. Longinebela ampulla sp. n. (Arcellinida: Hyalospheniidae), a New Testate Amoeba from Sphagnum Peatlands in Bulgaria. Acta zool. bulg., 70 (3), 2018: 285-292