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Tiny Organisms in Aquatic Habitats

Protisten.de Tiny Organisms in Aquatic Habitats

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Metazoa – Obazoa (Opisthokonta)

Illustrated Key for

Metazoa – Obazoa (Opisthokonta)

Porifera

Ephydatia fluviatilis — Ephydatia
fluviatilis

Spongilla lacustris — Spongilla
lacustris

Ephydatia fluviatilis — Ephydatia
fluviatilis

Spongilla lacustris — Spongilla
lacustris

Cnidaria/Hydrozoa

Cordylophora caspia — Cordylophora
caspia

Craspedacusta sowerbii — Craspedacusta
sowerbii

Hydra viridissima — Hydra
viridissima

Laomedea flexuosa — Laomedea
flexuosa

Cordylophora caspia — Cordylophora
caspia

Craspedacusta sowerbii — Craspedacusta
sowerbii

Hydra viridissima — Hydra
viridissima

Laomedea flexuosa — Laomedea
flexuosa

Bilateria/Protostomia/Annelida

Spirorbis spec — Spirorbis
spec.

Spirorbis spec — Spirorbis
spec.

Bilateria/Protostomia/Bryozoa

Bryozoa species — Bryozoa
species

Fredericella sultana — Fredericella
sultana

Plumatella spec. — Plumatella
spec.

Bryozoa species — Bryozoa
species

Fredericella sultana — Fredericella
sultana

Plumatella spec. — Plumatella
spec.

Bilateria/Protostomia/Crustacea

Bosmina longirostris — Bosmina
longirostris

Daphnia pulex — Daphnia
pulex

Bosmina longirostris — Bosmina
longirostris

Daphnia pulex — Daphnia
pulex

Bilateria/Protostomia/Rotifera

Grouped by taxonomic families, analogous to the identification literature. Alphabetical sorting in the menu under “Rotifera”.

Philodina megalotrocha — Philodina
megalotrocha

Rotaria tardigrada — Rotaria
tardigrada

Collotheca spec. — Collotheca
spec.

Collotheca ornata — Collotheca
ornata

Stephanoceros fimbriatus — Stephanoceros
fimbriatus

Floscularia ringens — Floscularia
ringens

Ptygura spec. — Ptygura
spec.

Ptygura brachiata — Ptygura
brachiata

Ptygura kostei — Ptygura
kostei

Ptygura kostei — Ptygura
kostei

Ptygura longicornis — Ptygura
longicornis

Ptygura pilula — Ptygura
pilula

Ptygura pilula — Ptygura
pilula

Hexarthra spec. — Hexarthra
spec.

Filinia longiseta — Filinia
longiseta

Filinia longiseta — Filinia
longiseta

Asplanchna priodonta — Asplanchna
priodonta

Brachionus spec. — Brachionus
spec.

Brachionus angularis bidens — Brachionus
angularis
bidens

Brachionus bidentatus — Brachionus
bidentatus

Keratella spec. — Keratella
spec.

Keratella cochlearis — Keratella
cochlearis

Notommata allantois — Notommata
allantois

Polyarthra spec. — Polyarthra
spec.

Polyarthra remata — Polyarthra
remata

Synchaeta spec. — Synchaeta
spec.

Synchaeta pectinata — Synchaeta
pectinata

Philodina megalotrocha — Philodina
megalotrocha

Rotaria tardigrada — Rotaria
tardigrada

Collotheca spec. — Collotheca
spec.

Collotheca ornata — Collotheca
ornata

Stephanoceros fimbriatus — Stephanoceros
fimbriatus

Floscularia ringens — Floscularia
ringens

Ptygura spec. — Ptygura
spec.

Ptygura brachiata — Ptygura
brachiata

Ptygura kostei — Ptygura
kostei

Ptygura kostei — Ptygura
kostei

Ptygura longicornis — Ptygura
longicornis

Ptygura pilula — Ptygura
pilula

Ptygura pilula — Ptygura
pilula

Hexarthra spec. — Hexarthra
spec.

Filinia longiseta — Filinia
longiseta

Filinia longiseta — Filinia
longiseta

Asplanchna priodonta — Asplanchna
priodonta

Brachionus spec. — Brachionus
spec.

Brachionus angularis bidens — Brachionus
angularis
bidens

Brachionus bidentatus — Brachionus
bidentatus

Keratella spec. — Keratella
spec.

Keratella cochlearis — Keratella
cochlearis

Notommata allantois — Notommata
allantois

Polyarthra spec. — Polyarthra
spec.

Polyarthra remata — Polyarthra
remata

Synchaeta spec. — Synchaeta
spec.

Synchaeta pectinata — Synchaeta
pectinata

Bilateria/Deuterostomia/Echinodermata

Echinodermata larva — Echinodermata
larva

Echinodermata larva — Echinodermata
larva

Bilateria/Deuterostomia/Chordata

Teleostei egg — Teleostei
egg

Teleostei egg — Teleostei
egg

© Wolfgang Bettighofer 2023–2025

New items

Centropyxis discoides — Centropyxis
discoides

Centropyxis gibba — Centropyxis
gibba

Centropyxis cassis — Centropyxis
cassis

Centropyxis elongata — Centropyxis
elongata

Centropyxis oblonga — Centropyxis
oblonga

Galeripora bathystoma — Galeripora
bathystoma

Difflugia capreolata — Difflugia
capreolata

Difflugia lebes var. masurica — Difflugia lebes
var. masurica

Difflugia globulosa — Difflugia
globulosa

Difflugia truncata — Difflugia
truncata

Difflugia parva — Difflugia
parva

Difflugia globularis — Difflugia
globularis

Micrasterias fimbriata — Micrasterias
fimbriata

Trieres chinensis — Trieres
chinensis

Coscinodiscus wailesii — Coscinodiscus
wailesii

Coscinodiscus concinnus — Coscinodiscus
concinnus

Euglypha filifera — Euglypha
filifera

Trinema lineare — Trinema
lineare

Difflugia urceolata — Difflugia
urceolata

Trinema enchelys — Trinema
enchelys

Centropyxis oblonga — Centropyxis
oblonga

Galeripora artocrea — Galeripora
artocrea

Arcella crenulata — Arcella
crenulata

Epithemia spec. — Epithemia
spec.

Difflugia brevicolla — Difflugia
brevicolla

Cocconeis placentula var. euglypta — Cocconeis
placentula
var. euglypta

Difflugia bryophila — Difflugia
bryophila

Lesquereusia spiralis — Lesquereusia
spiralis

Gibbocarina galeata — Gibbocarina
galeata

Arcella mitrata — Arcella
mitrata

Arcella gibbosa — Arcella
gibbosa

Arcella conica — Arcella conica

Euastrum didelta — Euastrum
didelta

Difflugia immanata — Difflugia
immanata

Cylindrifflugia acuminata — Cylindrifflugia
acuminata

Aulacoseira granulata — Aulacoseira
granulata

Hyalotheca mucosa var. laevicincta — Hyalotheca
mucosa
var. laevicincta

Haplotaenium rectum — Haplotaenium
rectum

Difflugia bacillifera — Difflugia
bacillifera

Difflugia brevicaulis — Difflugia
brevicaulis

Cosmarium nasutum — Cosmarium
nasutum

Closterium striolatum — Closterium
striolatum

Staurastrum teliferum — Staurastrum
teliferum

Cosmarium pseudopyramidatum — Cosmarium
pseudopyramidatum

New items

Centropyxis discoides — Centropyxis
discoides

Centropyxis gibba — Centropyxis
gibba

Centropyxis cassis — Centropyxis
cassis

Centropyxis elongata — Centropyxis
elongata

Centropyxis oblonga — Centropyxis
oblonga

Galeripora bathystoma — Galeripora
bathystoma

Difflugia capreolata — Difflugia
capreolata

Difflugia lebes var. masurica — Difflugia lebes
var. masurica

Difflugia globulosa — Difflugia
globulosa

Difflugia truncata — Difflugia
truncata

Difflugia parva — Difflugia
parva

Difflugia globularis — Difflugia
globularis

Micrasterias fimbriata — Micrasterias
fimbriata

Trieres chinensis — Trieres
chinensis

Coscinodiscus wailesii — Coscinodiscus
wailesii

Coscinodiscus concinnus — Coscinodiscus
concinnus

Euglypha filifera — Euglypha
filifera

Trinema lineare — Trinema
lineare

Difflugia urceolata — Difflugia
urceolata

Trinema enchelys — Trinema
enchelys

Centropyxis oblonga — Centropyxis
oblonga

Galeripora artocrea — Galeripora
artocrea

Arcella crenulata — Arcella
crenulata

Epithemia spec. — Epithemia
spec.

Difflugia brevicolla — Difflugia
brevicolla

Cocconeis placentula var. euglypta — Cocconeis
placentula
var. euglypta

Difflugia bryophila — Difflugia
bryophila

Lesquereusia spiralis — Lesquereusia
spiralis

Gibbocarina galeata — Gibbocarina
galeata

Arcella mitrata — Arcella
mitrata

Arcella gibbosa — Arcella
gibbosa

Arcella conica — Arcella conica

Euastrum didelta — Euastrum
didelta

Difflugia immanata — Difflugia
immanata

Cylindrifflugia acuminata — Cylindrifflugia
acuminata

Aulacoseira granulata — Aulacoseira
granulata

Hyalotheca mucosa var. laevicincta — Hyalotheca
mucosa
var. laevicincta

Haplotaenium rectum — Haplotaenium
rectum

Difflugia bacillifera — Difflugia
bacillifera

Difflugia brevicaulis — Difflugia
brevicaulis

Cosmarium nasutum — Cosmarium
nasutum

Closterium striolatum — Closterium
striolatum

Staurastrum teliferum — Staurastrum
teliferum

Cosmarium pseudopyramidatum — Cosmarium
pseudopyramidatum