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Typically fairly large amoeba from freshwater and marine environments.  No genetic information is available as yet (that I know of). Some species are very difficult to culture seeming to require a balance of bacteria and algae to survive. No Mayorella forms a cyst.  Some members of the genus Mayorella have scales, these have been suggested to be placed in another genus, but two genera Dactylamoeba and Korotnevella have been suggested to house these scale bearing species.  Most Mayorella have a cuticle visible at the E.M. level (like Thecamoeba) rather than scales. The scales are peculiarly like those described from a quite different genera Gyromitus, that seems otherwise to share more similarities to the Vahlkampfiidae (amoebo-flagellates).  Mayorella are rather difficult to clone and culture often requiring a mix of bacteria, algae and sometimes other protists.  I have found that many Mayorella thrive on Acanthamoeba (something I hate to do!).  Mayorella have a floating form with long radiating pseudopods as several other genera have (Vannella, Platyamoeba, Amoeba, Polychaos).

Left; A floating Mayorella, Middle-left; Locomoting trophozoite Bar=10mm, Right; Pair - Birefringence photograph showing bright spot (crystal?), right the same living amoeba under Hoffman optics(Bar=10mm).


Left a stained specimen. Mayorella at the Protist Information Server

This specimen above was isolated from Yellowcraigs beach, S.E. Scotland. The overall morphology of this species seems to resemble Korotnevella nivo (Smirnov, 1996/7), a disputed genera that may or may not eventually belong to Mayorella (see above).  The specimen below were found in an old fountain in Edinburgh rich in algae, the species is not known.  The amoeba below, left is demonstrating typical pseudopod formation with cone shaped structures arising from blunter bases.  Mayorella from both marine and freshwater seem to be not very adherent to glass or plastic (polystyrene) especially when well fed.

Described species:-
M. bigemma 100-150 mm in length
M. cantrabrigiensis
M. conipes (Sawyer, 1975)
M. corlissi (Sawyer, 1975)
M. gemmifera
M. kuwaitensis
M. riparia
M. smalli (Sawyer, 1975)
M. vespertiliodes
M. viridis  Contains symbiotic algae (giving it its colour and name) 90-160mm in length, 200nm thick cuticle.
Available strains:-
M. cantrabrigiensis CCAP 1547/7  (Page, 1981). Freshwater botanic gardens Cambridge, England.
M. cantrabrigiensis CCAP 1547/11  (Page, 1981). Freshwater botanic gardens Cambridge, England
M. gemmifera CCAP 1547/8 (Page, 1981). Marine Sheringham, Norfolk, England
M. gemmifera CCAP 1547/12 (Page, 1981). Marine Sheringham, Norfolk, England
M. kuwaitensis CCAP 1547/9 (Page, 1982). Marine Kuwait, England
M. vespertiliodes CCAP 1547/10 (Page, 1981). Freshwater, Pond Cambridge England
M. viridis CCAP 1547/4 (George, 1966). Freshwater Goonhilly Down, Cornwall, England

Page, F.C. (1983). "Marine Gymnamoebae." Inst.Terr.Ecol. NERC Cambridge, England.

Sawyer, T.K. (1975). "Marine amoebae from surface waters of Chincoteaque bay, Virginia : Two new genera and nine species within the families Mayorellidae, Flabellulidae, and Stereomyxidae."  Trans.Amer.Microscop.Soc. 94(1), 71-92.

Smirnov, A.V. (1996/7). "Two new species of marine amoebae: Hartmannella lobifera n.sp. and Korotnevella nivo n.sp. (Lobosea, Gymnamoebida)." Arch. Protistenkd. 147, 283-292.

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