Christinellula
Christinellula – Saarburg, Germany

GenusChristinellula” (working title)

Diagnosis: At first glance it looks like a Cochliopodium species, but in phase contrast it shows a different structure of the tectum. In normal locomotion, which is a little faster than that of Cochliopodium. In dorsal view it has a circular to oval veil and is about 12-14 µ in diameter. The cell body is more or less globular and about 12 µm high. In lateral view it resembles the Greek letter omega Ω. The tectum is covered with a large number of oval plate scales which are c. 1.8 µm long, measured light microscopically, and 1.15 – 2.3 µm, measured in SEM. The scales on top of the cell body are larger then those on the veil.

Ecology: the precise environmental conditions are not clear. The first time I found this amoeboid in several numbers in a sample from the river Saar near Saarburg, Germany, 2014. Two weeks later I found this species in a sample from Crailoo, one of my favorite locations. In 2015 I also found it in a clean ditch near Montfoort, the Netherlands. In July 2015 I found it in a sample which I took from a small stream in Bretagne, France. After that I have found it in many more places, e.g. a mountain stream in Argentina and the Wannsee in Berlin. I is quite common in mesotrophic water types, but you can only detect it in wet mounts kept for some days in a moist chamber.
Its taxonomic position is unclear.

Christinellula
Christinellula
Cell DIC with scales all around – Saarburg, Germany
Christinellula
Christinellula
Some scales visible – Saarburg, Germany
Christinellula
Cell with four filopodia – Saarburg, Germany
Christinellula
Notice the difference in scale size between the two specimens – Saar, Germany
Christinellula
Cell in Phase contrast – Saarburg, Germany
Christinellula
Saar, Germany
Christinellula
This specimen is larger than the German and Dutch species. It came from a clear small stream in Bretagne, France.
Christinellula
Christinellula
Specimen from Crailoo, the Netherlands
Christinellula
Christinellula
Tectum – Crailoo, the Netherlands
Christinellula
Christinellula
Specimen with radiating scales – the Netherlands
Christinellula
Christinellula
Scales visible
Christinellula
Christinellula
Radiating scales on the body hump
Christinellula
Christinellula, in LM and SEM (SEM Eckhard Voelcker)
Christinellula
Christinellula
Specimens from the Gooimeer and IJsselmeer, Netherlands
Christinellula
Christinellula
Specimen from Crailoo, Netherlands, the same individual
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