Tiny Organisms in Aquatic Habitats

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Colorless Flagellates –
Amoebozoa (Part), Cryptista (Part), Discoba (Part), Alveolates (Part), Stramenopiles (Part)

Illustrated Key for

Colorless Flagellates – Flagellates without Chloroplasts

Amoebozoa – Evosea

Archamoebae/Mastigamoebida

Mastigamoeba aspera — Mastigamoeba
aspera

Mastigamoeba aspera — Mastigamoeba
aspera

© Wolfgang Bettighofer 2023–2024

New items

Cylindrocystis crassa — Cylindrocystis
crassa

Netrium digitus var. lamellosum — Netrium
digitus
var. lamellosum

Netrium digitus var. latum — Netrium
digitus
var. latum

Netrium oblongum — Netrium
oblongum

Planotaenium interruptum — Planotaenium
interruptum

Spirogyra spec. — Spirogyra
spec.

Zygnema spec. — Zygnema
spec.

Gonatozygon kinahanii — Gonatozygon
kinahanii

Mougeotia spec. — Mougeotia
spec.

Penium polymorphum var. polymorphum — Penium
polymorphum
var. polymorphum

Mougeotia spec. — Mougeotia
spec.

Penium spirostriolatum — Penium
spirostriolatum

Netrium digitus — Netrium
digitus

Cylindrocystis brebissonii — Cylindrocystis
brebissonii

Micrasterias rotata — Micrasterias
rotata

Desmidium swartzii — Desmidium
swartzii

Staurastrum capitulum — Staurastrum
capitulum

Xanthidium antilopaeum — Xanthidium
antilopaeum

Euastrum neosinuosum — Euastrum
neosinuosum

Tetmemorus brebissonii — Tetmemorus
brebissonii

Cosmarium pachydermum — Cosmarium
pachydermum

Micrasterias thomasiana var. notata — Micrasterias
thomasiana
var. notata

Euastrum ansatum — Euastrum
ansatum

Staurastrum forficulatum var. verrucosum — Staurastrum
forficulatum
var. verrucosum

Cosmarium neodepressum — Cosmarium
neodepressum

Xanthidium armatum — Xanthidium
armatum

Euastrum oblongum — Euastrum
oblongum

Cosmarium porteanum — Cosmarium
porteanum

Micrasterias truncata — Micrasterias
truncata

Euastrum rhomboidale — Euastrum
rhomboidale

Staurastrum furcatum — Staurastrum
furcatum

Xanthidium uncinatum — Xanthidium
uncinatum

Hyalotheca dissiliens — Hyalotheca
dissiliens

Cosmarium pseudonitidulum var. validum — Cosmarium
pseudonitidulum
var. validum

Micrasterias truncata var. bahusiensis — Micrasterias
truncata
var. bahusiensis

Euastrum bidentatum — Euastrum
bidentatum

Staurastrum hirsutum — Staurastrum
hirsutum

Actinotaenium cucurbitinum — Actinotaenium
cucurbitinum

Hyalotheca minor — Hyalotheca
minor

Cosmarium pyramidatum — Cosmarium
pyramidatum

Micrasterias truncata var. quadrata — Micrasterias
truncata
var. quadrata

Euastrum binale var. gutwinskii — Euastrum
binale
var. gutwinskii

Staurastrum inconspicuum — Staurastrum
inconspicuum

Bambusina borreri — Bambusina
borreri

Micrasterias americana — Micrasterias
americana

Cosmarium quadratulum — Cosmarium
quadratulum

Pleurotaenium trabecula var. elongatum — Pleurotaenium
trabecula
var. elongatum

Euastrum coeseli — Euastrum
coeseli

Staurastrum margaritacaeum — Staurastrum
margaritacaeum

Cosmarium bicuneatum — Cosmarium
bicuneatum

Micrasterias apiculata — Micrasterias
apiculata

Cosmarium simplicius — Cosmarium
simplicius

Pleurotaenium crenulatum — Pleurotaenium
crenulatum

Euastrum crassum — Euastrum
crassum

Staurastrum simonyi var. sparsiaculeatum — Staurastrum
simonyi
var. sparsiaculeatum

Cosmarium caelatum — Cosmarium
caelatum

Micrasterias crux-melitensis — Micrasterias
crux-melitensis

Cosmarium sparsepunctatum — Cosmarium
sparsepunctatum

Pleurotaenium ehrenbergii — Pleurotaenium
ehrenbergii

Euastrum didelta — Euastrum
didelta

Staurastrum spongiosum var. perbifidum — Staurastrum
spongiosum
var. perbifidum

Cosmarium connatum — Cosmarium
connatum

Micrasterias denticulata — Micrasterias
denticulata

Cosmarium subarctoum — Cosmarium
subarctoum

Pleurotaenium trabecula var. trabecula — Pleurotaenium
trabecula
var. trabecula

Euastrum humerosum — Euastrum
humerosum

Staurastrum teliferum — Staurastrum
teliferum

Staurodesmus dejectus — Staurodesmus
dejectus

Pandorina spec. — Pandorina
spec.

Cosmarium conspersum — Cosmarium
conspersum

Lemmermannia komarekii — Lemmermannia
komarekii

Micrasterias papillifera — Micrasterias
papillifera

Trebouxia arboricola — Trebouxia
arboricola

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Eremosphaera viridis — Eremosphaera
viridis

Spondylosium pulchellum — Spondylosium
pulchellum

Goniochloris tripus — Goniochloris
tripus

Tetmemorus granulatus var. granulatus — Tetmemorus
granulatus
var. granulatus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Euastrum humerosum var. affine — Euastrum
humerosum
var. affine

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Staurodesmus convergens — Staurodesmus
convergens

Raphidocelis arcuata — Raphidocelis
arcuata

Cosmarium integrum — Cosmarium
integrum

Volvox aureus — Volvox
aureus

Micrasterias rotata — Micrasterias
rotata

Crucigeniella lunaris — Crucigeniella
lunaris

Desmidium grevillei — Desmidium
grevillei

Dimorphococcus lunatus — Dimorphococcus
lunatus

Staurastrum alternans — Staurastrum
alternans

Microspora irregularis — Microspora
irregularis

Tetmemorus laevis var. laevis — Tetmemorus
laevis
var. laevis

Dictyosphaerium ehrenbergianum — Dictyosphaerium
ehrenbergianum

Euastrum luetkemuelleri var. carniolicum — Euastrum
luetkemuelleri
var. carniolicum

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Stauridium tetras — Stauridium
tetras

Pseudostaurastrum limneticum — Pseudostaurastrum
limneticum

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Hindakia tetrachotoma — Hindakia
tetrachotoma

Monactinus simplex var. sturmii — Monactinus
simplex
var. sturmii

Parapediastrum biradiatum — Parapediastrum
biradiatum

Coelastrum microporum var. octaedricum — Coelastrum
microporum
var. octaedricum

Pediastrum braunii — Pediastrum
braunii

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Micractinium pusillum — Micractinium
pusillum

Haematococcus lacustris — Haematococcus
lacustris

Octactis speculum — Octactis
speculum

Ceramium diaphanum — Ceramium
diaphanum

New items

Cylindrocystis crassa — Cylindrocystis
crassa

Netrium digitus var. lamellosum — Netrium
digitus
var. lamellosum

Netrium digitus var. latum — Netrium
digitus
var. latum

Netrium oblongum — Netrium
oblongum

Planotaenium interruptum — Planotaenium
interruptum

Spirogyra spec. — Spirogyra
spec.

Zygnema spec. — Zygnema
spec.

Gonatozygon kinahanii — Gonatozygon
kinahanii

Mougeotia spec. — Mougeotia
spec.

Penium polymorphum var. polymorphum — Penium
polymorphum
var. polymorphum

Mougeotia spec. — Mougeotia
spec.

Penium spirostriolatum — Penium
spirostriolatum

Netrium digitus — Netrium
digitus

Cylindrocystis brebissonii — Cylindrocystis
brebissonii

Micrasterias rotata — Micrasterias
rotata

Desmidium swartzii — Desmidium
swartzii

Staurastrum capitulum — Staurastrum
capitulum

Xanthidium antilopaeum — Xanthidium
antilopaeum

Euastrum neosinuosum — Euastrum
neosinuosum

Tetmemorus brebissonii — Tetmemorus
brebissonii

Cosmarium pachydermum — Cosmarium
pachydermum

Micrasterias thomasiana var. notata — Micrasterias
thomasiana
var. notata

Euastrum ansatum — Euastrum
ansatum

Staurastrum forficulatum var. verrucosum — Staurastrum
forficulatum
var. verrucosum

Cosmarium neodepressum — Cosmarium
neodepressum

Xanthidium armatum — Xanthidium
armatum

Euastrum oblongum — Euastrum
oblongum

Cosmarium porteanum — Cosmarium
porteanum

Micrasterias truncata — Micrasterias
truncata

Euastrum rhomboidale — Euastrum
rhomboidale

Staurastrum furcatum — Staurastrum
furcatum

Xanthidium uncinatum — Xanthidium
uncinatum

Hyalotheca dissiliens — Hyalotheca
dissiliens

Cosmarium pseudonitidulum var. validum — Cosmarium
pseudonitidulum
var. validum

Micrasterias truncata var. bahusiensis — Micrasterias
truncata
var. bahusiensis

Euastrum bidentatum — Euastrum
bidentatum

Staurastrum hirsutum — Staurastrum
hirsutum

Actinotaenium cucurbitinum — Actinotaenium
cucurbitinum

Hyalotheca minor — Hyalotheca
minor

Cosmarium pyramidatum — Cosmarium
pyramidatum

Micrasterias truncata var. quadrata — Micrasterias
truncata
var. quadrata

Euastrum binale var. gutwinskii — Euastrum
binale
var. gutwinskii

Staurastrum inconspicuum — Staurastrum
inconspicuum

Bambusina borreri — Bambusina
borreri

Micrasterias americana — Micrasterias
americana

Cosmarium quadratulum — Cosmarium
quadratulum

Pleurotaenium trabecula var. elongatum — Pleurotaenium
trabecula
var. elongatum

Euastrum coeseli — Euastrum
coeseli

Staurastrum margaritacaeum — Staurastrum
margaritacaeum

Cosmarium bicuneatum — Cosmarium
bicuneatum

Micrasterias apiculata — Micrasterias
apiculata

Cosmarium simplicius — Cosmarium
simplicius

Pleurotaenium crenulatum — Pleurotaenium
crenulatum

Euastrum crassum — Euastrum
crassum

Staurastrum simonyi var. sparsiaculeatum — Staurastrum
simonyi
var. sparsiaculeatum

Cosmarium caelatum — Cosmarium
caelatum

Micrasterias crux-melitensis — Micrasterias
crux-melitensis

Cosmarium sparsepunctatum — Cosmarium
sparsepunctatum

Pleurotaenium ehrenbergii — Pleurotaenium
ehrenbergii

Euastrum didelta — Euastrum
didelta

Staurastrum spongiosum var. perbifidum — Staurastrum
spongiosum
var. perbifidum

Cosmarium connatum — Cosmarium
connatum

Micrasterias denticulata — Micrasterias
denticulata

Cosmarium subarctoum — Cosmarium
subarctoum

Pleurotaenium trabecula var. trabecula — Pleurotaenium
trabecula
var. trabecula

Euastrum humerosum — Euastrum
humerosum

Staurastrum teliferum — Staurastrum
teliferum

Staurodesmus dejectus — Staurodesmus
dejectus

Pandorina spec. — Pandorina
spec.

Cosmarium conspersum — Cosmarium
conspersum

Lemmermannia komarekii — Lemmermannia
komarekii

Micrasterias papillifera — Micrasterias
papillifera

Trebouxia arboricola — Trebouxia
arboricola

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Eremosphaera viridis — Eremosphaera
viridis

Spondylosium pulchellum — Spondylosium
pulchellum

Goniochloris tripus — Goniochloris
tripus

Tetmemorus granulatus var. granulatus — Tetmemorus
granulatus
var. granulatus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Euastrum humerosum var. affine — Euastrum
humerosum
var. affine

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Staurodesmus convergens — Staurodesmus
convergens

Raphidocelis arcuata — Raphidocelis
arcuata

Cosmarium integrum — Cosmarium
integrum

Volvox aureus — Volvox
aureus

Micrasterias rotata — Micrasterias
rotata

Crucigeniella lunaris — Crucigeniella
lunaris

Desmidium grevillei — Desmidium
grevillei

Dimorphococcus lunatus — Dimorphococcus
lunatus

Staurastrum alternans — Staurastrum
alternans

Microspora irregularis — Microspora
irregularis

Tetmemorus laevis var. laevis — Tetmemorus
laevis
var. laevis

Dictyosphaerium ehrenbergianum — Dictyosphaerium
ehrenbergianum

Euastrum luetkemuelleri var. carniolicum — Euastrum
luetkemuelleri
var. carniolicum

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Stauridium tetras — Stauridium
tetras

Pseudostaurastrum limneticum — Pseudostaurastrum
limneticum

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Hindakia tetrachotoma — Hindakia
tetrachotoma

Monactinus simplex var. sturmii — Monactinus
simplex
var. sturmii

Parapediastrum biradiatum — Parapediastrum
biradiatum

Coelastrum microporum var. octaedricum — Coelastrum
microporum
var. octaedricum

Pediastrum braunii — Pediastrum
braunii

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Micractinium pusillum — Micractinium
pusillum

Haematococcus lacustris — Haematococcus
lacustris

Octactis speculum — Octactis
speculum

Ceramium diaphanum — Ceramium
diaphanum