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protozoa

Entamoeba histolytica



individual trophozoites from feces


individual trophozoites from feces


individual cysts from feces





Entamoeba coli

individual trophozoites from feces

individual trophozoites from feces

cysts from feces






Entamoeba gingivalis





Cysts of Giarida intestinalis (syn. Giardia lamblia)

Giardia intestinalis
(Mastigophora)
live fecal cyst from dog in Kansas

Giardia intestinalis
(Mastigophora)
stained cysts from feces of Kansas resident




Giardia intestinalis (syn. Giardia lamblia)trophozoites

view through nuclei
(Kansas canine)

ventral adhesive disc
(Kansas canine)

polychrome IV stain
(human)






Plasmodium falciparum (Apicomplexa)
(Malignant tertian malaria)

ring stages
microgametocyte

macrogametocytes




Plasmodium malariae (Apicomplexa)
(Quartan malaria)
(technically, this species should probably be regarded as a synonym of the primate malaria, Plasmodium brasilianum)

ring stages

bands
"trophozoite"

developing segmenters (meronts)

mature segmenters (note rosette arrangement of merozoite nuclei)



Plasmodium vivax (Apicomplexa)
(Benign tertian malaria)

ring stages

immature, developing segmenters (meronts)

mature segmenters (meronts)
Schuffner's dots
gametocyte






Toxoplasma gondii


Tissue cysts of 3 Sarcocystidae from the central nervous system

Frenkelia microti
(vole)
some up to 1 mm diameter

Neospora caninum
(calf)
this cyst 29 x 28 micrometers

Toxoplasma gondii
(mouse)
this cyst 25 x 25 micrometers




Toxoplasma gondii


Sporulated oocysts of 3 intestinal coccidia from felids
(all same magnification)

Isospora felis
(35-50 x 25-38 micrometers)

Isospora rivolta
(25-30 x 18-25 micrometers)

Toxoplasma gondii
(10-12 x 12-14 micrometers)





Trichomonas vaginalis

Some miscellaneous flagellates

Opalina sp. (Opalinata)
trophozoite from Pseudacris streckeri

Trichonympha campanula
trophozoites from termite gut

Trichomonas vaginalis(Mastigophora)
trophozoites from culture

Trichomonas vaginalis(Mastigophora)
longitudinal binary fission




Trypanosoma cruzi

Some miscellaneous Kinetoplastids

Leishmania donovani
(host: hamster)
liver smear

Trypanosoma cruzi
(host: rat)
trypomastigote in blood

Trypanosoma cruzi
(host: rat)
amastigotes in heart muscle



Balantidium coli cyst

Some miscellaneous ciliates

Balantidium coli cyst
(intestine of swine)
40-60 micrometers in diameter

Ichthyophthirius multifiliis trophozoite
(in skin of freshwater fish)
up to 1 mm long

Nyctotherus sp. trophozoites
(Geochelone dendriculata)




Balantidium coli trophozoites
(Ciliophora)


Above: oil immersion photomicrographs of individual trophozoites


High dry objective photomicrographs of trophozoites

Balantidium coli
intestinal ulceration
Numerous trophozoites
in intestinal tissue