Family: Body more or less triangular to spatulate; tapered, round-tipped pseudopods.
Genus: Clear pseudopods, formed from clear anterior, more or less broad margin (Illustrated Guide, 1985).

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Group I: Subpseudopodia, digitiform cones (5 samples)
M. bigemma μm Saitama, 1999	M. bigemma ? μm Otawara Tochigi, 2000	M. oclawaha 50-69, 2-3 μm Japan, 199?	M. riparia 50-54, 2-3, ? μm Japan, 199?

Group II: Subpseudopodia, broadly based mammilliform or nearly hemisperical pyramids (44 samples)
II-a: Pseudopods triangular to mammilliform; cell body more or less tubular (7 samples)
M. leidyi 189, ?, ? μm vesicular nucleus Japan, 199?	M. leidyi DSR images Japan, 199?	M. leidyi ? Okinawa, 199?	M. leidyi 100, 12, 6 μm vesicular nucleus Japan, 199?
II-b: Pseudopods triangular; cell body more or less flat (37 samples)
M. hohuensis 150-175, 10, 6 μm vesicular nucleus Japan, 199?	M. viridis μm with Chlorella 1999-2008	M. inquisita ??, ? μm Japan, 199?	M. penardi 75-94, ?, ? μm Japan, 199?
II-c: Pseudopods broad, cell body flat ellipsoidal (13 samples)
Mayorella sp. 180, 20, 12 μm cytoplasm vacuolated fuzzy surface Japan, 1998	Mayorella sp. 148, 16 & 5 μm cytoplasm vacuolated composite nucleus Japan, 1998	Mayorella sp. 125, 10, 7 μm cytoplasm vacuolated Japan, 1998	Mayorella sp. 50-75, 5, 3 μm Japan, 1998

??? (3 samples)
Mayorella sp. ?, ?, ? Japan, 1998	Mayorella sp. 6-8, ?, ? μm very small Japan, 199?	Mayorella sp. ?? 106 x 96, ?, ? μm hyaline zone present Japan, 1998

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