Taphrocampa annulosa (Gosse, 1851)
Most likely ID: n.a.
Sampling location: Simmelried
Phylogenetic tree: Taphrocampa annulosa
- body stout or elongate, worm- or spindle-shaped
- length 140–230 µm
- dorsal cuticle is sticky with transverse folds
- cuticle soft or somewhat stiffened
- foot rudimentary, toes short, conical and slightly curved
- no bumps between the toes
- wheel organ of Notommata-type
- auricles retractable
retrocerebral organ with attached eyespot
So far I have found only a few specimens of Taphrocampa annulosa. All findings are from the Simmelried. Mostly I discover the specimens when they slide with the ventral side along floating coverslips. The genus Taphrocampa is easily recognized by the folded dorsal cuticle. To distinguish the two similar species Taphrocampa annulosa and Taphrocampa selenura, the shape of the toes must be considered. In Taphrocampa annulosa, they are short, curved inward, and taper to a blunt tip. In Taphrocampa selenura, on the other hand, the toes are much longer, saber-shaped, and curved inward to a sharp point. In my specimens, the toes were short and blunt, so Taphrocampa annulosa is present here.
The dorsal cuticle of Taphrocampa annulosa is described to be sticky, so adherent foreign particles and bacteria are often found on it. With my (few) specimens I could not observe this.
More images and information of Taphrocampa annulosa: Michael Plewka-Freshwater life-Taphrocampa annulosa
Fig. 1 a-c: Taphrocampa annulosa. L = 178 µm. Ventral view of a freely gliding specimen. Obj. 60 X.
Fig. 2 a-b: Taphrocampa annulosa. L = 178 µm. Dorsal view of the same specimen shown in fig. 1 a-c. Note typical transversal folds especially in the contracted specimen (b). The retrocerebral organ (RCO) is shining bright in DIC. Obj. 60 X.
Fig. 3 a-c: Taphrocampa annulosa. L = 201 µm. A second specimen in ventral view. TO = toes. Obj. 60 X.
Fig. 4 a-c: Taphrocampa annulosa. L = 201 µm. Lateral view from left of the same specimen shown in fig. 3 a-c. Note the lateral antenna (LA) and the dorsal folds (DF) of the cuticle. Obj. 60 X.
Fig. 5: Taphrocampa annulosa. The retrocerebral organ (RO) in a strongly squashed specimen. It is consisting of many birefringent spherules (Sph). TR = trophi. Obj. 100 X.
Fig. 6 a-b: Taphrocampa annulosa. Two focal planes of the trophy in a strongly squashed specimen. TR = trophi. Obj. 100 X.