Fig. 4
From: Functional traits data for testate amoebae of Northern Holarctic realm
Position of the aperture: (a) straight terminal (Assulina muscorum); (b) sub terminal (Cyphoderia ampullula); (c) central ventral (Arcella catinus); (d) shifted ventral (Centropyxis aerophila); (e) amphistomic (Archerella flavum).
