Genus: Clear pseudopods, formed from clear anterior, more or less broad margin (Illustrated Guide, 1985).
Group I: Subpseudopodia, digitiform cones. (a: Short conical subpseudopodia)
Species: 30-50 μm long; L/B >2; 1-4 pairs of pseudopodia which also occur singly; many tiny crystals; nucleus 3.5 μm (Page, 1976).
Mayorella (oclawaha ?),
locomotive 43 μm long,
nucleus 2-3 μm diam.,
x 400, x 640, by Y. Tsukii
M. penardi: 50-125 (usually > 100) μm; L/B to 4.5; with shallow anterior hyaline edge which bears several mamilliform pseudopodia; may divide into Y shape in changing direction; floating form usually irregularly rounded, very rarely radiate; nucleus 6.5-10 μm (Page, 1976).