Testate Amoebae –
Amoebozoa (Part), Stramenopiles (Part), Rhizaria (Part)
Observations on Arcella hemisphaerica
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Taxonomic tree according to Lahr et al., 2019 (https://doi.org/10.1016/j.cub.2019.01.078)
and González-Miguéns et al., 2022 (https://doi.org/10.1016/j.ympev.2022.107557)
Amorphea Adl et al., 2012
Amoebozoa Lühe, 1913, renewed definition Cavalier-Smith, 1998
● Tubulinea Smirnov et al., 2005
●● Elardia, Kang et al., 2017
●●● Order Arcellinida Kent, 1880
●●●● Suborder Glutinoconcha Lahr et al., 2019
●●●●● Infraorder Sphaerothecina Kosakyan, Lara and Lahr, 2016
●●●●●● Family Arcellidae Ehrenberg, 1843
●●●●●●● Genus Arcella Ehrenberg, 1832
Arcella hemisphaerica Perty, 1852
Most likely ID: n.a.
Basionym: n.a.
Add’l Synonyms: Arcella hemisphaerica f. undulata Deflandre, 1928
Arcella hemisphaerica var. depressa Playfair, 1918
Arcella hemisphaerica var. tuberculata Stepanek, 1963
Arcella rotundata Playfair, 1918
Arcella rotundata var. alta Playfair, 1918
Arcella rotundata var. aplanata Deflandre, 1928
Arcella rotundata var. stenostoma Deflandre, 1928
Arcella rotundata var. stenostoma f. undulata Deflandre, 1928
Arcella rotundata var. alta f. undulata Stepanek,1963
Sampling date 09/2011. Scale bars indicate 25 µm (1,2), 50 µm (3).
Members of the genus Arcella construct a proteinaceous test (shell) with numerous tiny alveoli reinforcing the test.
Three images.
First and second: | Lateral view, focus on cytoplasma. |
Third: | Top view, synoptic representations of the test. |
Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!
Place name: Bog Hegne Moor near Lake Constance (Germany)
Latitude: 47.718106 Longitude: 9.093974
Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.

Scale bar indicates 50 µm.
Place name: Pond situated in the vicinity of Lake Constance (Germany)
Latitude: 47.734945 Longitude: 9.091097
Microscope Zeiss Universal, camera Olympus C7070WZ.

Sampling date 04/2007. Scale bar indicates 25 µm.
The image shows a test from dorsal and ventral. On the ventral side, the aperture, two contractile vacuoles and two vesicular nuclei with centric nucleolus each are visible.
Place name: Pond Demühlen, rain storage reservoir in Kiel-Russee (Schleswig-Holstein, Germany)
Latitude: 54.304095 Longitude: 10.086073
Microscope Zeiss Universal, camera Olympus C7070WZ. DOF images.
© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.
New items
crassa
digitus
var. lamellosum
digitus
var. latum
oblongum
interruptum
spec.
spec.
kinahanii
spec.
polymorphum
var. polymorphum
spec.
spirostriolatum
digitus
brebissonii
rotata
swartzii
capitulum
antilopaeum
neosinuosum
brebissonii
pachydermum
thomasiana
var. notata
ansatum
forficulatum
var. verrucosum
neodepressum
armatum
oblongum
porteanum
truncata
rhomboidale
furcatum
uncinatum
dissiliens
pseudonitidulum
var. validum
truncata
var. bahusiensis
bidentatum
hirsutum
cucurbitinum
minor
pyramidatum
truncata
var. quadrata
binale
var. gutwinskii
inconspicuum
borreri
americana
quadratulum
trabecula
var. elongatum
coeseli
margaritacaeum
bicuneatum
apiculata
simplicius
crenulatum
crassum
simonyi
var. sparsiaculeatum
caelatum
crux-melitensis
sparsepunctatum
ehrenbergii
didelta
spongiosum
var. perbifidum
connatum
denticulata
subarctoum
trabecula
var. trabecula
humerosum
teliferum
dejectus
spec.
conspersum
komarekii
papillifera
arboricola
venustum
var. excavatum
viridis
pulchellum
tripus
granulatus
var. granulatus
subspicatus
humerosum
var. affine
nostochinearum
convergens
arcuata
integrum
aureus
rotata
lunaris
grevillei
lunatus
alternans
irregularis
laevis
var. laevis
ehrenbergianum
luetkemuelleri
var. carniolicum
reticulatum
tetras
limneticum
viridis
cystozygote
tetrachotoma
simplex
var. sturmii
biradiatum
microporum
var. octaedricum
braunii
reinhardtii
pusillum
lacustris
speculum
diaphanum
New items
crassa
digitus
var. lamellosum
digitus
var. latum
oblongum
interruptum
spec.
spec.
kinahanii
spec.
polymorphum
var. polymorphum
spec.
spirostriolatum
digitus
brebissonii
rotata
swartzii
capitulum
antilopaeum
neosinuosum
brebissonii
pachydermum
thomasiana
var. notata
ansatum
forficulatum
var. verrucosum
neodepressum
armatum
oblongum
porteanum
truncata
rhomboidale
furcatum
uncinatum
dissiliens
pseudonitidulum
var. validum
truncata
var. bahusiensis
bidentatum
hirsutum
cucurbitinum
minor
pyramidatum
truncata
var. quadrata
binale
var. gutwinskii
inconspicuum
borreri
americana
quadratulum
trabecula
var. elongatum
coeseli
margaritacaeum
bicuneatum
apiculata
simplicius
crenulatum
crassum
simonyi
var. sparsiaculeatum
caelatum
crux-melitensis
sparsepunctatum
ehrenbergii
didelta
spongiosum
var. perbifidum
connatum
denticulata
subarctoum
trabecula
var. trabecula
humerosum
teliferum
dejectus
spec.
conspersum
komarekii
papillifera
arboricola
venustum
var. excavatum
viridis
pulchellum
tripus
granulatus
var. granulatus
subspicatus
humerosum
var. affine
nostochinearum
convergens
arcuata
integrum
aureus
rotata
lunaris
grevillei
lunatus
alternans
irregularis
laevis
var. laevis
ehrenbergianum
luetkemuelleri
var. carniolicum
reticulatum
tetras
limneticum
viridis
cystozygote
tetrachotoma
simplex
var. sturmii
biradiatum
microporum
var. octaedricum
braunii
reinhardtii
pusillum
lacustris
speculum
diaphanum