Arcella vulgaris (sketch)

Diameter 30-150 micrometres

Freshwater, mainly in nutrient-rich lakes and ponds, around vegetation, also in moist soil

Omnivorous, feeding on smaller bacteria, diatoms, algae, flagellates, and ciliates

 

Arcella and relatives are protected by shells formed from secreted materials. These are initially clear yellow, turning dark brown with age.

 

Kingdom Protozoa / Protista

Phylum Amoebozoa

Class Tubulinea

 

I have a photo of some similar species as microlife.parvarium.com.

Done