I find Amphileptus punctatus very rarely and always only single specimens. Almost all findings I made in autumn among decomposing leaves at the bottom of the waters.

The most striking feature of Amphileptus punctatus are the drop-shaped extrusomes, which are highly refractive and therefore noticeable even at small magnifications (s. figs. 2 a, 4 and 6). The body is slightly sigmoid-shaped, and in my population, the specimens were between 130–175 µm long.

The macronucleus consists of two separate parts, between which the micronucleus is located (s. fig. 4). In my population, this was often diffuse and difficult to recognize.

In the anterior third on the ventral side, there are usually only a few extrusomes present. At most, there are about 10, as described by Foissner et al. (1994). Often there were fewer. In my specimens, the extrusomes were about 4 µm long (s. fig. 6). These distinctively shaped extrusomes are specialized for stunning peritrich ciliates like Carchesium or Vorticella, on which Amphileptus punctatus has specialized.

The ciliation of Amphileptus punctatus is typical for the genus. The right side is ciliated, with 18–25 rows of cilia, while the left side is bare except for 4–6 rows of short, bristle-like cilia. On the dorsal side in the anterior third, there is also a conspicuous dorsal brush visible (s. fig. 3 a-b) .