Table 1.

List of organelles noted and methanotroph observations for each M. barleeanus via TEM; m = mitochondria, p = peroxisome, v = vacuole, fv = food vacuole (or residual body), fb = fibrous body, g = Golgi, n = nucleus, l = lipid.

Specimen #	Organelles observed	Methanotroph observations
1	m, p, v, fv, fb, g, n	none
2	m, p, v, fv, fb, l, n	many in apertural region
3	m, p, v, fv, fb, l	many in apertural region + 1 in final chamber
4	m, p, v, fv, fb, g, l	few on exterior (not near aperture)