Notosolenus apocamptus

(Stokes, 1884) Stokes, 1884

Most likely ID: n.a.


Synonym: n.a.


Sampling location: Simmelried


Phylogenetic tree: Notosolenus apocamptus



  • body oval with longitudinal, dorsal groove
  • cross-section of body is curved
  • length 7–16 µm, width 4–8 µm
  • reservoir on right side
  • nucleus on left side
  • leading flagelling twice of body length
  • trailing flagellum up to three-quarter of body length
  • anterior and posterior end can be beveled
Notosolenus apocamptus

I found Notosolenus apocamptus in the Simmelried in November 2007. After that I have no further records of this flagellate.


Notosolenus apocamptus can be confused with Petalomonas minuta, but the genus Petalomonas has only one flagellum, so the detection of the trailing flagellum (s. fig. 1 b) is important for identification. Notosolenus apocamptus has a dorsal groove, which is why the flagellate appears curved in cross section (s. figs. 1 c and 1 d). In addition, the anterior or posterior end is often beveled (s. fig. 1 a and drawings above).


Notosolenus apocamptus was found in freshwater by Stokes and Skuja. However, Larsen & Patterson (1990) also found this flagellate in saltwater.


Fig. 1 a-e: Notosolenus apocamptus. L = 15 µm. Dorsal view (a, b), apical view (c, d) and lateral view (e) of a freely swimming specimen. Note the beveled anterior end (arrow) and that the body is arcuate in cross section due to the dorsal groove (DG). CV = contractile vacuole, LF = leading flagellum, Nu = nucleus, TF = trailing flagellum. Obj. 100 X.