Light (A) and scanning electron (B-I) micrographs of Quadrulella longicollis. (A, B) View of many specimens to illustrate variability in shape and size of the shell. (C, D) Broad lateral view of two individuals to show the general shape. (E) Narrow lateral view. (F) Apertural view. (G) Close up view of aperture to illustrate its elliptical shape and bordering thin collar of organic cement (H) Lateral view of aperture. (I) Detail of shell surface showing shape and arrangement of shell-plates.

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