Leishmania donovani

1
Leishmania donovani
This is a protist that can cause serious disease
and is in a genus often transmitted by sandflies.
This protist feeds by absorbing food across its
membrane.
2
Trichomonas vaginalis
This is a protist that can cause
sexually-transmitted disease and is in a genus
often transmitted by sandflies. This protist
feeds by absorbing food across its membrane.
3
Amoeba proteus
This protist is surrounding a small food particle
with its pseudopods in order to ingest it.
4
Actinosphaerium eichornii
What look like spikes on this protist are
actually pseudopods, which the protist uses to
trap smaller protists to feed on them.
5
Plasmodium falciparum
This protist is one of the main causes of
Malaria. This protist cannot produce its own
food and it also doesnt move on its own.
Therefore, it is a parasite which lives off its
host.
6
Monocystis agilis
This protist cannot produce its own food or move
on its own. Therefore, it is a parasite which
lives off its host. This protist is often found
in earthworms.
7
Paramecium aurelia
This protist is found in many freshwater
environments. Notice how its cilia are organized
into evenly-spaced rows and bundles. These beat
in a regular pattern to allow the Paramecium to
feed and move.
8
Stentor oken
This protist is common in freshwater lakes and
streams. Notice the row of cilia organized around
the end and along the sides. The Stentor beat
these cilia and create a vortex-like movement,
drawing in single-celled bacteria to feed on.
They also use their cilia to swim.
9
Euglena acus
These freshwater single-celled organisms can
either obtain energy from sunlight, via
photosynthesis, or by absorbing chemicals from
their surroundings. A sensory organ, known as the
eye spot (red in the picture) is able to perceive
the intensity of light.
10
Dinobryonsertularia
This colony of unicellular protists.are known for
their gold-colored chloroplasts which they use to
carry out photosynthesis.
11
Bacillariophyta
These protists are single-celled photosynthetic
organisms. Their cell walls are composed of two
interlocking silica halves. They cause algal
blooms. When they die, they sink to the ocean
floor, becoming part of the sediment. The
preserved remains provide a valuable record of
past oceanic environments.
12
Bacillariophyta
These protists are single-celled photosynthetic
organisms that are an important part of the
aquatic food chain. Their cell walls are composed
of two interlocking silica halves.
13
Karenia brevis
Although it is difficult to see in this photo,
this protist actually moves with a spinning
motion produced by its two flagella. It creates
huge algal blooms. This is very common in the
gulf of Mexico and is responsible for red tides
and die-offs of marine life and coastal birds.
14
Ceratium hirundinella
This unicellular protist has a thick cell wall
and two flagella, which it uses to move. It also
contains chloroplasts which it uses to carry out
photosynthesis.
15
Porphyra nereocystis
This multicellular protist is often mistaken for
a plant because it obtains nutrients through
photosynthesis. It can live up to 260 meters
deep in the ocean because its reddish pigments
are so efficient at gathering light.
16
Sargassum
This multicellular protist is a common sight on
beaches and in coastal waters. The brown
accessory pigment called fucoxanthin that the
protist uses to carry out photosynthesis gives it
its brown coloring. Sargassum is used for food.
17
Fucus vesiculosus
This multicellular protist is a more common along
the rocky shores on the east coast of the United
States. The brown accessory pigment called
fucoxanthin that the protist uses to carry out
photosynthesis gives it its brown coloring. It
is used for food and as a homeopathic remedy.
18
Volvox
This species of protists lives in multicellular
colonies. The colonies can contain as many as
50,000 cells arranged in hollow spheres.
19
Spirogyra
This species of protists lives in multicellular
colonies. These filiments contain the same
pigments found in plants and are surrounded by a
cell wall just like in plants. This protist is
very commonly found in freshwater environments.
20
Physarum polycephalum
This species of protist plays a key role in
recycling organic material since it is a
decomposer. It is shown here growing on the
forest floor.
21
Saprolegnia parasitica
This type of protist is usually found on or near
the water, growing on dead or decaying material.
Notice the spores contained within the oogonium
shown on the right, which the fungus uses for
sexual reproduction.