Reproduction of testate amoebae by binary fission: (A) Sphenoderia lenta; (B) Heleopera sylvatica; (D) Arcella dentata (the shell of parent is dark-brown because the alveoli are enriched with iron, used to strengthen the shell wall; this inorganic material is not usually present in the alveoli of young animals and their shells are light yellowish).

  Part of: Todorov M, Bankov N (2019) An Atlas of Sphagnum-Dwelling Testate Amoebae in Bulgaria. Advanced Books.