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Platyamoeba |
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Page
updated 30/4/03 |
| The most commonly
isolated amoeba from marine environments. Most species have been
isolated from marine environments. It may be differentiated from Vannella
(another very common flattened amoeba) by comparing the locomotory and
floating morphology (Page
1980; Page
1983).
A salt tolerant amoeba (Hauer
et al, 2001)
that resembled Vannella in shape, locomotive habit and floating
habit turned out to be a Platyamoeba upon E.M. inspection so
these diagnostic features must be applied cautiously when attempting to
differentiate between these two common genera. The criteria for
differentiating the two genera at the E.M. level are the glycostyles,
glycoprotein assemblages that project from the cell surface.
Recent SSurDNA gene analysis (Sims
et al, 2002)
casts doubt on the validity of the idea that Platyamoeba and Vannella
are different genera (see Vannella vs Platyamoeba).
 Platyamoeba
at the Protist Information Server
| Described
species:- |
| P.
australis
Marine (Page, 1983)
CCAP1565/9 Marorchydore, nr. Brisbane, Australia |
| P.
bursella
Marine (Page, 1973) CCAP
1565/10 River Deben, Woodbridge, Suffolk, England |
| P.
calycinucleolus
Marine (Page, 1973) CCAP
1565/6 beach, West Mersea, Essex, England |
| P.
douvresi
Marine
13mm
in length |
| P.
flabellata
Marine |
| P.
mainensis
Marine |
| P.
murchelanoi
Marine |
| P.
nucleolilateralis (Anderson
et al, 2003)
ATCC50987
Marine or semi-marine. 12-24mm
in length. Most diagnostic feature is the nucleolus which
is present as a single mass about 1mm
in maximum dimension, that often appears to be touching the
nuclear membrane. Floating form with long tapering
pseudopods, like Vannella. Mitochondria have branching
tubular cristae. |
| P. placida
Freshwater
(Page, 1969) CCAP 1565/2 stream outflow, Madison, Wisconsin,
USA. |
| P. plurinucleolus
Marine (Page, 1974)
ATCC50745
(SSUrRNA gene AY121849
complete); CCAP 1565/7 CCAP 1565/11 both from a beach,
West Mersea, Essex, England. 8-34mm
in length |
| P.
pseudovannellida
(Hauer et
al, 2001) Marine |
| P.
langae
Marine ATCC50816
|
| P.
leei
Marine |
| P.
schaefferri
Freshwater
27-29mm
in length |
| P.
stenopodia
Freshwater
(Page,
1969)
CCAP 1565/3 CCAP 1565/8 both public lake, Tuskegee, Alabama,
USA. |
| P. thermophila ATCC50600 |
| P.
weinsteini
Marine |
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References:-
Anderson,
O. R. (1998) Densities and diversity of Gymnamoebae in relation to some
inshore aquatic habitats in Berbmuda. J.Eukaryotic Microbiol. 45,
151-155.
Anderson
OR, Nerad TA, Cole JC.
(2003) Platyamoeba
nucleolilateralis n.sp. from the Chesapeake bay region. J.Eukaryot.Microbiol.
50, 57-60.
Hauer
G, Rogerson A, Anderson OR. (2001) Platyamoeba pseudovannellida N.Sp., a naked amoeba with
wide salt tolerance isolated from the Salton sea, California. J.
Euk. Microbiol. 48, 663-669.
Page, F. C. (1974) Some marine Platyamoeba
of East Anglia. J.Mar.Biol.Assn. U.K. 54, 651-664.
Page, F.C. (1969) Platyamoeba
stenopodia n. g., n. sp., a freshwater amoeba. J
Protozool.
16(3):437-41.
Page, F. C. (1980) Fine structure of some
marine strains of Platyamoeba (Gymnamoebia, Thecamoebidae). Protistologica.
14, 605-612.
Page, F. C. (1980) A light- and
electron-microscopical comparison of limax and flabellate marine amoeba
belonging to four genera. Protistologica. 16, 57-78.
Page, F. C. (1983) Marine
Gymnamoebae. Institute of Terrestrial Ecology. NERC.
Sims
GP, Aitken R, Rogerson A.
(2002) Identification and phylogenetic analysis of morphologically
similar naked amoebae using small subunits ribosomal RNA. J.Eukaryot.Microbiol.
49, 478-484.
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