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Tiny Organisms in Aquatic Habitats
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 Parasites in Algae and 
Cyanobacteria

Illustrated Key for

Parasites in Algae and Cyanobacteria

Chytridiomycota

Chitrid on Chaetoceros similis
Chitrid on
Chaetoceros
similis
Chitrid on Chroococcus turgidus
Chitrid on
Chroococcus
turgidus
Chitrid on Desmodesmus opoliensis
Chitrid on
Desmodesmus
opoliensis
Chitrid on Melosira varians
Chitrid on
Melosira
varians
Chitrid on Oocystis lacustris
Chitrid on
Oocystis
lacustris
Rhizophydium ubiquetum on Xanthidium basiornatum
Rhizophydium ubiquetum on
Xanthidium
basiornatum
Chitrid on Chaetoceros similis
Chitrid on
Chaetoceros
similis
Chitrid on Chroococcus turgidus
Chitrid on
Chroococcus
turgidus
Chitrid on Desmodesmus opoliensis
Chitrid on
Desmodesmus
opoliensis
Chitrid on Melosira varians
Chitrid on
Melosira
varians
Chitrid on Oocystis lacustris
Chitrid on
Oocystis
lacustris
Rhizophydium ubiquetum on Xanthidium basiornatum
Rhizophydium ubiquetum on
Xanthidium
basiornatum

Cysts of Parasites

Parasite cyst in Euastrum ventricosum
Parasite cyst in
Euastrum
ventricosum
Parasite cyst in Mougeotia spec.
Parasite cyst in
Mougeotia
spec.
Parasite cyst in Trachelomonas spec.
Parasite cyst in
Trachelomonas
spec.
Parasite cyst in Euastrum ventricosum
Parasite cyst in
Euastrum
ventricosum
Parasite cyst in Mougeotia spec.
Parasite cyst in
Mougeotia
spec.
Parasite cyst in Trachelomonas spec.
Parasite cyst in
Trachelomonas
spec.

Other Parasitic Organisms

Fungal parasite in Netrium digitus
Fungal parasite in
Netrium
digitus
Parasite hole in Closterium costatum
Parasite hole in
Closterium
costatum
Fungal parasite in Netrium digitus
Fungal parasite in
Netrium
digitus
Parasite hole in Closterium costatum
Parasite hole in
Closterium
costatum
© Wolfgang Bettighofer 2023–2025

New items

Cosmarium elegantissimiforme
Cosmarium
elegantissimiforme
Cosmarium pseudowillei
Cosmarium
pseudowillei
Xanthidium antilopaeum
Xanthidium
antilopaeum
Xanthidium laeve
Xanthidium
laeve
Xanthidium basiornatum
Xanthidium
basiornatum
Staurastrum capitulum
Staurastrum
capitulum
Serritaenia spec.
Serritaenia
spec.
Pseudonebela africana
Pseudonebela
africana
Cosmarium caelatum
Cosmarium
caelatum
Closterium acerosum
Closterium acerosum
Micrasterias pinnatifida
Micrasterias
pinnatifida
Cosmarium striolatum
Cosmarium
striolatum
Cosmarium decedens
Cosmarium
decedens
Acutodesmus acutiformis
Acutodesmus
acutiformis
Stephanodiscus astraea
Stephanodiscus
astraea
Desmatractum bipyramidatum
Desmatractum
bipyramidatum
Peridinium cinctum
Peridinium
cinctum
Coelastrum pulchrum
Coelastrum
pulchrum
Limnias melicerta
Limnias
melicerta
Dimorphococcus lunatus
Dimorphococcus
lunatus
Tetmemorus brebissonii
Tetmemorus
brebissonii
Gloeodinium montanum
Gloeodinium
montanum
Closterium directum
Closterium
directum
Pleurotaenium truncatum
Pleurotaenium
truncatum
Staurastrum vestitum var. vestitum
Staurastrum
vestitum
var. vestitum
Cosmarium meneghinianum
Cosmarium
meneghinianum
Euastrum didelta
Euastrum
didelta
Micrasterias furcata
Micrasterias
furcata
Micrasterias jenneri
Micrasterias
jenneri
Euastrum ventricosum
Euastrum
ventricosum
Euastrum insigne
Euastrum
insigne
Actinotaenium cucurbita
Actinotaenium
cucurbita
Micrasterias fimbriata
Micrasterias
fimbriata
Actinotaenium cucurbita
Actinotaenium
cucurbita
Coscinodiscus wailesii
Coscinodiscus
wailesii
Euglypha filifera
Euglypha
filifera
Ditylum brightwellii
Ditylum
brightwellii

New items

Cosmarium elegantissimiforme
Cosmarium
elegantissimiforme
Cosmarium pseudowillei
Cosmarium
pseudowillei
Xanthidium antilopaeum
Xanthidium
antilopaeum
Xanthidium laeve
Xanthidium
laeve
Xanthidium basiornatum
Xanthidium
basiornatum
Staurastrum capitulum
Staurastrum
capitulum
Serritaenia spec.
Serritaenia
spec.
Pseudonebela africana
Pseudonebela
africana
Cosmarium caelatum
Cosmarium
caelatum
Closterium acerosum
Closterium acerosum
Micrasterias pinnatifida
Micrasterias
pinnatifida
Cosmarium striolatum
Cosmarium
striolatum
Cosmarium decedens
Cosmarium
decedens
Acutodesmus acutiformis
Acutodesmus
acutiformis
Stephanodiscus astraea
Stephanodiscus
astraea
Desmatractum bipyramidatum
Desmatractum
bipyramidatum
Peridinium cinctum
Peridinium
cinctum
Coelastrum pulchrum
Coelastrum
pulchrum
Limnias melicerta
Limnias
melicerta
Dimorphococcus lunatus
Dimorphococcus
lunatus
Tetmemorus brebissonii
Tetmemorus
brebissonii
Gloeodinium montanum
Gloeodinium
montanum
Closterium directum
Closterium
directum
Pleurotaenium truncatum
Pleurotaenium
truncatum
Staurastrum vestitum var. vestitum
Staurastrum
vestitum
var. vestitum
Cosmarium meneghinianum
Cosmarium
meneghinianum
Euastrum didelta
Euastrum
didelta
Micrasterias furcata
Micrasterias
furcata
Micrasterias jenneri
Micrasterias
jenneri
Euastrum ventricosum
Euastrum
ventricosum
Euastrum insigne
Euastrum
insigne
Actinotaenium cucurbita
Actinotaenium
cucurbita
Micrasterias fimbriata
Micrasterias
fimbriata
Actinotaenium cucurbita
Actinotaenium
cucurbita
Coscinodiscus wailesii
Coscinodiscus
wailesii
Euglypha filifera
Euglypha
filifera
Ditylum brightwellii
Ditylum
brightwellii