English: Magnetite magnetosomes with elongated prismatic habits from magnetotactic Alphaproteobacteria. (A) TEM image of a cell of a vibrioid MTB from Lake Mead, Nevada, containing a chain of elongated magnetosomes. (B) TEM image of two double chains of elongated magnetosomes from a freshwater coccus. (C) High-resolution TEM image of a magnetosome from a freshwater coccus with (D) its selected-area electron diffraction pattern (in [1–10] orientation) and (E) a morphological model that consists of six large and six small dodecahedral faces, and smaller faces of the cube and octahedron. The elongation direction is [111].