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Tiny Organisms in Aquatic Habitats

Protisten.de Tiny Organisms in Aquatic Habitats

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Illustrated Key for

Heliozoa – Haptista (Part), Stramenopiles (Part), Obazoa (Part)

Haptista – Centroplasthelida

Panacanthocystida/Acanthocystida

Acanthocystis pectinata — Acanthocystis
pectinata

Acanthocystis penardi — Acanthocystis
penardi

Acanthocystis turfacea — Acanthocystis
turfacea

Raphidocystis marginata — Raphidocystis
marginata

Raphidocystis marginata — Raphidocystis
marginata

Raphidocystis pallida — Raphidocystis
pallida

Raphidocystis tubifera — Raphidocystis
tubifera

Acanthocystis pectinata — Acanthocystis
pectinata

Acanthocystis penardi — Acanthocystis
penardi

Acanthocystis turfacea — Acanthocystis
turfacea

Raphidocystis marginata — Raphidocystis
marginata

Raphidocystis marginata — Raphidocystis
marginata

Raphidocystis pallida — Raphidocystis
pallida

Raphidocystis tubifera — Raphidocystis
tubifera

Pterocystida/Pterista

Chlamydaster laciniatus — Chlamydaster
laciniatus

Sphaerastrum fockii — Sphaerastrum
fockii

Chlamydaster laciniatus — Chlamydaster
laciniatus

Sphaerastrum fockii — Sphaerastrum
fockii

Pterocystida/Raphidista

Choanocystis aculeata — Choanocystis
aculeata

Choanocystis aculeata — Choanocystis
aculeata

Choanocystis perpusilla — Choanocystis
perpusilla

Raphidiophrys capitata — Raphidiophrys
capitata

Raphidiophrys coerulea — Raphidiophrys
coerulea

Raphidiophrys elegans — Raphidiophrys
elegans

Raphidiophrys viridis — Raphidiophrys
viridis

Choanocystis aculeata — Choanocystis
aculeata

Choanocystis aculeata — Choanocystis
aculeata

Choanocystis perpusilla — Choanocystis
perpusilla

Raphidiophrys capitata — Raphidiophrys
capitata

Raphidiophrys coerulea — Raphidiophrys
coerulea

Raphidiophrys elegans — Raphidiophrys
elegans

Raphidiophrys viridis — Raphidiophrys
viridis

Obazoa – Opisthokonta

Nucletmycea

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia delicatula — Nuclearia
delicatula

Nuclearia radians — Nuclearia
radians

Nuclearia simplex — Nuclearia
simplex

Nuclearia simplex — Nuclearia
simplex

Nuclearia simplex — Nuclearia
simplex

Pompholyxophrys punicea — Pompholyxophrys
punicea

Pompholyxophrys punicea — Pompholyxophrys
punicea

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia spec. — Nuclearia
spec.

Nuclearia delicatula — Nuclearia
delicatula

Nuclearia radians — Nuclearia
radians

Nuclearia simplex — Nuclearia
simplex

Nuclearia simplex — Nuclearia
simplex

Nuclearia simplex — Nuclearia
simplex

Pompholyxophrys punicea — Pompholyxophrys
punicea

Pompholyxophrys punicea — Pompholyxophrys
punicea

SAR-Stramenopiles

Actinophryidae

Actinophrys sol — Actinophrys
sol

Actinophrys sol — Actinophrys
sol

Actinosphaerium eichhornii — Actinosphaerium
eichhornii

Actinosphaerium eichhornii var. viride — Actinosphaerium
eichhornii

Actinophrys sol — Actinophrys
sol

Actinophrys sol — Actinophrys
sol

Actinosphaerium eichhornii — Actinosphaerium
eichhornii

Actinosphaerium eichhornii var. viride — Actinosphaerium
eichhornii

© Wolfgang Bettighofer 2023–2025

New items

Closterium striolatum — Closterium
striolatum

Staurastrum teliferum — Staurastrum
teliferum

Cosmarium pseudopyramidatum — Cosmarium
pseudopyramidatum

Cosmarium pyramidatum — Cosmarium
pyramidatum

Staurastrum scabrum — Staurastrum
scabrum

Staurastrum capitulum — Staurastrum
capitulum

Staurastrum forficulatum — Staurastrum
forficulatum

Staurastrum oligacanthum var. incisum — Staurastrum
oligacanthum
var. incisum

Mesotaenium chlamydosporum — Mesotaenium
chlamydosporum

Staurastrum arcuatum var. subavicula — Staurastrum
arcuatum
var. subavicula

Micrasterias truncata var. quadrata — Micrasterias
truncata
var. quadrata

Difflugia rubescens — Difflugia
rubescens

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Cosmarium ralfsii var. montanum — Cosmarium
ralfsii
var. montanum

Micrasterias ralfsii — Micrasterias
ralfsii

Netrium digitus — Netrium
digitus

Closterium acerosum — Closterium
acerosum

Closterium intermedium — Closterium
intermedium

Hyalotheca dissiliens — Hyalotheca
dissiliens

Closterium kuetzingii — Closterium
kuetzingii

Closterium ralfsii var. hybridum — Closterium
ralfsii
var. hybridum

Volvox aureus — Volvox
aureus

Cosmarium botrytis — Cosmarium
botrytis

Cosmarium quadratum — Cosmarium
quadratum

Cosmarium quadrum — Cosmarium
quadrum

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

Cylindrocystis brebissonii — Cylindrocystis
brebissonii

Micrasterias rotata — Micrasterias
rotata

Desmidium swartzii — Desmidium
swartzii

Xanthidium antilopaeum — Xanthidium
antilopaeum

Euastrum neosinuosum — Euastrum
neosinuosum

Micrasterias thomasiana var. notata — Micrasterias
thomasiana
var. notata

Staurastrum forficulatum var. verrucosum — Staurastrum
forficulatum
var. verrucosum

Xanthidium armatum — Xanthidium
armatum

Euastrum oblongum — Euastrum
oblongum

Euastrum rhomboidale — Euastrum
rhomboidale

Staurastrum furcatum — Staurastrum
furcatum

Xanthidium uncinatum — Xanthidium
uncinatum

Staurastrum hirsutum — Staurastrum
hirsutum

Actinotaenium cucurbitinum — Actinotaenium
cucurbitinum

Hyalotheca minor — Hyalotheca
minor

Bambusina borreri — Bambusina
borreri

Micrasterias americana — Micrasterias
americana

Euastrum coeseli — Euastrum
coeseli

Micrasterias apiculata — Micrasterias
apiculata

Cosmarium simplicius — Cosmarium
simplicius

Euastrum crassum — Euastrum
crassum

Staurastrum simonyi var. sparsiaculeatum — Staurastrum
simonyi
var. sparsiaculeatum

Cosmarium caelatum — Cosmarium
caelatum

Micrasterias crux-melitensis — Micrasterias
crux-melitensis

Pleurotaenium ehrenbergii — Pleurotaenium
ehrenbergii

Euastrum didelta — Euastrum
didelta

Staurastrum spongiosum var. perbifidum — Staurastrum
spongiosum
var. perbifidum

Micrasterias denticulata — Micrasterias
denticulata

Staurodesmus dejectus — Staurodesmus
dejectus

Cosmarium conspersum — Cosmarium
conspersum

Micrasterias papillifera — Micrasterias
papillifera

Lemmermannia komarekii — Lemmermannia
komarekii

Trebouxia arboricola — Trebouxia
arboricola

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Spondylosium pulchellum — Spondylosium
pulchellum

Goniochloris tripus — Goniochloris
tripus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Staurodesmus convergens — Staurodesmus
convergens

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Raphidocelis arcuata — Raphidocelis
arcuata

Desmidium grevillei — Desmidium
grevillei

Tetmemorus laevis var. laevis — Tetmemorus
laevis
var. laevis

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Haematococcus lacustris — Haematococcus
lacustris

Octactis speculum — Octactis
speculum

New items

Closterium striolatum — Closterium
striolatum

Staurastrum teliferum — Staurastrum
teliferum

Cosmarium pseudopyramidatum — Cosmarium
pseudopyramidatum

Cosmarium pyramidatum — Cosmarium
pyramidatum

Staurastrum scabrum — Staurastrum
scabrum

Staurastrum capitulum — Staurastrum
capitulum

Staurastrum forficulatum — Staurastrum
forficulatum

Staurastrum oligacanthum var. incisum — Staurastrum
oligacanthum
var. incisum

Mesotaenium chlamydosporum — Mesotaenium
chlamydosporum

Staurastrum arcuatum var. subavicula — Staurastrum
arcuatum
var. subavicula

Micrasterias truncata var. quadrata — Micrasterias
truncata
var. quadrata

Difflugia rubescens — Difflugia
rubescens

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Cosmarium ralfsii var. montanum — Cosmarium
ralfsii
var. montanum

Micrasterias ralfsii — Micrasterias
ralfsii

Netrium digitus — Netrium
digitus

Closterium acerosum — Closterium
acerosum

Closterium intermedium — Closterium
intermedium

Hyalotheca dissiliens — Hyalotheca
dissiliens

Closterium kuetzingii — Closterium
kuetzingii

Closterium ralfsii var. hybridum — Closterium
ralfsii
var. hybridum

Volvox aureus — Volvox
aureus

Cosmarium botrytis — Cosmarium
botrytis

Cosmarium quadratum — Cosmarium
quadratum

Cosmarium quadrum — Cosmarium
quadrum

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

Cylindrocystis brebissonii — Cylindrocystis
brebissonii

Micrasterias rotata — Micrasterias
rotata

Desmidium swartzii — Desmidium
swartzii

Xanthidium antilopaeum — Xanthidium
antilopaeum

Euastrum neosinuosum — Euastrum
neosinuosum

Micrasterias thomasiana var. notata — Micrasterias
thomasiana
var. notata

Staurastrum forficulatum var. verrucosum — Staurastrum
forficulatum
var. verrucosum

Xanthidium armatum — Xanthidium
armatum

Euastrum oblongum — Euastrum
oblongum

Euastrum rhomboidale — Euastrum
rhomboidale

Staurastrum furcatum — Staurastrum
furcatum

Xanthidium uncinatum — Xanthidium
uncinatum

Staurastrum hirsutum — Staurastrum
hirsutum

Actinotaenium cucurbitinum — Actinotaenium
cucurbitinum

Hyalotheca minor — Hyalotheca
minor

Bambusina borreri — Bambusina
borreri

Micrasterias americana — Micrasterias
americana

Euastrum coeseli — Euastrum
coeseli

Micrasterias apiculata — Micrasterias
apiculata

Cosmarium simplicius — Cosmarium
simplicius

Euastrum crassum — Euastrum
crassum

Staurastrum simonyi var. sparsiaculeatum — Staurastrum
simonyi
var. sparsiaculeatum

Cosmarium caelatum — Cosmarium
caelatum

Micrasterias crux-melitensis — Micrasterias
crux-melitensis

Pleurotaenium ehrenbergii — Pleurotaenium
ehrenbergii

Euastrum didelta — Euastrum
didelta

Staurastrum spongiosum var. perbifidum — Staurastrum
spongiosum
var. perbifidum

Micrasterias denticulata — Micrasterias
denticulata

Staurodesmus dejectus — Staurodesmus
dejectus

Cosmarium conspersum — Cosmarium
conspersum

Micrasterias papillifera — Micrasterias
papillifera

Lemmermannia komarekii — Lemmermannia
komarekii

Trebouxia arboricola — Trebouxia
arboricola

Cosmarium venustum var. excavatum — Cosmarium
venustum
var. excavatum

Spondylosium pulchellum — Spondylosium
pulchellum

Goniochloris tripus — Goniochloris
tripus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Staurodesmus convergens — Staurodesmus
convergens

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Raphidocelis arcuata — Raphidocelis
arcuata

Desmidium grevillei — Desmidium
grevillei

Tetmemorus laevis var. laevis — Tetmemorus
laevis
var. laevis

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Haematococcus lacustris — Haematococcus
lacustris

Octactis speculum — Octactis
speculum