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

Haptista – Centroplasthelida

Pterocystida/Pterista

Chlamydaster laciniatus — Chlamydaster
laciniatus

Sphaerastrum fockii — Sphaerastrum
fockii

Chlamydaster laciniatus — Chlamydaster
laciniatus

Sphaerastrum fockii — Sphaerastrum
fockii

Haptista – Centroplasthelida

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 2023–2024

New items

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Pseudopediastrum subgranulatum — Pseudopediastrum
subgranulatum

Pandorina spec. — Pandorina
spec.

Lemmermannia komarekii — Lemmermannia
komarekii

Trebouxia arboricola — Trebouxia
arboricola

Eremosphaera viridis — Eremosphaera
viridis

Crucigenia fenestrata — Crucigenia
fenestrata

Goniochloris tripus — Goniochloris
tripus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Microthamnion strictissimum — Microthamnion
strictissimum

Raphidocelis arcuata — Raphidocelis
arcuata

Goniochloris sculpta — Goniochloris
sculpta

Volvox aureus — Volvox
aureus

Crucigeniella lunaris — Crucigeniella
lunaris

Dimorphococcus lunatus — Dimorphococcus
lunatus

Nephrochlamys rostrata — Nephrochlamys
rostrata

Selenastrum bibraianum — Selenastrum
bibraianum

Microspora irregularis — Microspora
irregularis

Dictyosphaerium ehrenbergianum — Dictyosphaerium
ehrenbergianum

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Oocystis marssonii — Oocystis
marssonii

Stauridium tetras — Stauridium
tetras

Pseudostaurastrum enorme — Pseudostaurastrum
enorme

Oedogonium spec. — Oedogonium
spec.

Kirchneriella obesa — Kirchneriella
obesa

Oocystis parva — Oocystis
parva

Tetradesmus dimorphus — Tetradesmus
dimorphus

Pseudostaurastrum limneticum — Pseudostaurastrum
limneticum

Ankistrodesmus falcatus — Ankistrodesmus
falcatus

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Lacunastrum gracillimum — Lacunastrum
gracillimum

Rayssiella hemisphaerica — Rayssiella
hemisphaerica

Tetradesmus lagerheimii — Tetradesmus
lagerheimii

Bumilleria sicula — Bumilleria
sicula

Botryosphaerella sudetica — Botryosphaerella
sudetica

Glochiococcus aciculiferus — Glochiococcus
aciculiferus

Monactinus simplex — Monactinus
simplex

Tetrastrum elegans — Tetrastrum
elegans

Chlorophyta cyst — Chlorophyta
cyst

Tetraedron caudatum — Tetraedron
caudatum

Chaetophoropsis pisiformis — Chaetophoropsis
pisiformis

Characium angustum — Characium
angustum

Hindakia tetrachotoma — Hindakia
tetrachotoma

Monactinus simplex var. sturmii — Monactinus
simplex
var. sturmii

Asterococcus superbus — Asterococcus
superbus

Treubaria triappendiculata — Treubaria
triappendiculata

Coleochaete spec. — Coleochaete
spec.

Chlorotetraedron incus — Chlorotetraedron
incus

Parapediastrum biradiatum — Parapediastrum
biradiatum

Cladophora spec. zoospores — Cladophora
spec.
zoospores

Chlamydomonas mutabilis — Chlamydomonas
mutabilis

Chlorella spec. — Chlorella
spec.

Coelastrum microporum var. octaedricum — Coelastrum
microporum
var. octaedricum

Lemmermannia tetrapedia — Lemmermannia
tetrapedia

Pediastrum braunii — Pediastrum
braunii

Ulothrix speciosa — Ulothrix
speciosa

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Chlorella vulgaris — Chlorella
vulgaris

Desmodesmus communis — Desmodesmus
communis

Micractinium pusillum — Micractinium
pusillum

Pseudopediastrum boryanum var. longicorne — Pseudopediastrum
boryanum
var. longicorne

Klebsormidium dissectum — Klebsormidium
dissectum

Haematococcus lacustris — Haematococcus
lacustris

Coccomyxa confluens — Coccomyxa
confluens

Desmodesmus opoliensis var. carinatus — Desmodesmus
opoliensis
var. carinatus

Micractinium quadrisetum — Micractinium
quadrisetum

Porphyridium purpureum — Porphyridium
purpureum

Chrysopyxis paludosa — Chrysopyxis
paludosa

Octactis speculum — Octactis
speculum

Ceramium diaphanum — Ceramium
diaphanum

Virescentia helminthosa — Virescentia
helminthosa

New items

Glaucocystis nostochinearum — Glaucocystis
nostochinearum

Pseudopediastrum subgranulatum — Pseudopediastrum
subgranulatum

Pandorina spec. — Pandorina
spec.

Lemmermannia komarekii — Lemmermannia
komarekii

Trebouxia arboricola — Trebouxia
arboricola

Eremosphaera viridis — Eremosphaera
viridis

Crucigenia fenestrata — Crucigenia
fenestrata

Goniochloris tripus — Goniochloris
tripus

Desmodesmus subspicatus — Desmodesmus
subspicatus

Microthamnion strictissimum — Microthamnion
strictissimum

Raphidocelis arcuata — Raphidocelis
arcuata

Goniochloris sculpta — Goniochloris
sculpta

Volvox aureus — Volvox
aureus

Crucigeniella lunaris — Crucigeniella
lunaris

Dimorphococcus lunatus — Dimorphococcus
lunatus

Nephrochlamys rostrata — Nephrochlamys
rostrata

Selenastrum bibraianum — Selenastrum
bibraianum

Microspora irregularis — Microspora
irregularis

Dictyosphaerium ehrenbergianum — Dictyosphaerium
ehrenbergianum

Hydrodictyon reticulatum — Hydrodictyon
reticulatum

Oocystis marssonii — Oocystis
marssonii

Stauridium tetras — Stauridium
tetras

Pseudostaurastrum enorme — Pseudostaurastrum
enorme

Oedogonium spec. — Oedogonium
spec.

Kirchneriella obesa — Kirchneriella
obesa

Oocystis parva — Oocystis
parva

Tetradesmus dimorphus — Tetradesmus
dimorphus

Pseudostaurastrum limneticum — Pseudostaurastrum
limneticum

Ankistrodesmus falcatus — Ankistrodesmus
falcatus

Eremosphaera viridis cystozygote — Eremosphaera
viridis
cystozygote

Lacunastrum gracillimum — Lacunastrum
gracillimum

Rayssiella hemisphaerica — Rayssiella
hemisphaerica

Tetradesmus lagerheimii — Tetradesmus
lagerheimii

Bumilleria sicula — Bumilleria
sicula

Botryosphaerella sudetica — Botryosphaerella
sudetica

Glochiococcus aciculiferus — Glochiococcus
aciculiferus

Monactinus simplex — Monactinus
simplex

Tetrastrum elegans — Tetrastrum
elegans

Chlorophyta cyst — Chlorophyta
cyst

Tetraedron caudatum — Tetraedron
caudatum

Chaetophoropsis pisiformis — Chaetophoropsis
pisiformis

Characium angustum — Characium
angustum

Hindakia tetrachotoma — Hindakia
tetrachotoma

Monactinus simplex var. sturmii — Monactinus
simplex
var. sturmii

Asterococcus superbus — Asterococcus
superbus

Treubaria triappendiculata — Treubaria
triappendiculata

Coleochaete spec. — Coleochaete
spec.

Chlorotetraedron incus — Chlorotetraedron
incus

Parapediastrum biradiatum — Parapediastrum
biradiatum

Cladophora spec. zoospores — Cladophora
spec.
zoospores

Chlamydomonas mutabilis — Chlamydomonas
mutabilis

Chlorella spec. — Chlorella
spec.

Coelastrum microporum var. octaedricum — Coelastrum
microporum
var. octaedricum

Lemmermannia tetrapedia — Lemmermannia
tetrapedia

Pediastrum braunii — Pediastrum
braunii

Ulothrix speciosa — Ulothrix
speciosa

Chlamydomonas reinhardtii — Chlamydomonas
reinhardtii

Chlorella vulgaris — Chlorella
vulgaris

Desmodesmus communis — Desmodesmus
communis

Micractinium pusillum — Micractinium
pusillum

Pseudopediastrum boryanum var. longicorne — Pseudopediastrum
boryanum
var. longicorne

Klebsormidium dissectum — Klebsormidium
dissectum

Haematococcus lacustris — Haematococcus
lacustris

Coccomyxa confluens — Coccomyxa
confluens

Desmodesmus opoliensis var. carinatus — Desmodesmus
opoliensis
var. carinatus

Micractinium quadrisetum — Micractinium
quadrisetum

Porphyridium purpureum — Porphyridium
purpureum

Chrysopyxis paludosa — Chrysopyxis
paludosa

Octactis speculum — Octactis
speculum

Ceramium diaphanum — Ceramium
diaphanum

Virescentia helminthosa — Virescentia
helminthosa