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The Protozoans. Ciliates Amoeboid Protozoans Flagellated Protozoans. Kingdom Protozoa. Defining Characteristics All are unicellular eukaryotes What is a prokaryote ? Many species are both heterotrophic and autotrophic simultaneously or at different stages of the lifecycle. - PowerPoint PPT Presentation
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Kingdom Protozoa1
The Protozoans
Ciliates
Amoeboid Protozoans
Flagellated Protozoans
Kingdom Protozoa2
Kingdom Protozoa
Defining Characteristics– All are unicellular eukaryotes– What is a prokaryote?– Many species are both heterotrophic and
autotrophic simultaneously or at different stages of the lifecycle
Eukaryote Cell
Prokaryote Cell
Kingdom Protozoa5
Adaptability
Protozoans are ecologically important primary producers, consumers and as vital links in the food chain
Humans are greatly effected by parasitic protozoans either directly or indirectly – Effects range from irritating - fatal
Malaria (Plasmodium spp.) worldwide epidemic
Kingdom Protozoa6
Reproduction
Asexual reproduction – Replication of chromosomes and the splitting of the
parent into two or more parts – Binary fission – Multiple fission – Budding
Protozoans are problematic in their associations as colonial forms
Kingdom Protozoa7
Asexual Reproduction
Amoeba
CiliateFlagellate
Kingdom Protozoa8
Classification
Kingdom Protozoa
Phylum Ciliophora (Ciliates)
The Sarcodinids (Amoeboid Protozoans)
Phylum Foraminifera
Phylum Radiozoa
The Flagellated Protozoans
Phytoflagellated protozoans
Zooflagellated protozoans
Kingdom Protozoa9
Phylum Ciliophora
Defining characteristics– Body externally ciliated in at
least some lifecycle stages
Have the highest degree of subcellular specialization and are considered advanced protozoans
Paramecium feces
Kingdom Protozoa10
Cilia
Cilia – Hair-like structures by
which the organism moves, collects food and senses their surroundings
Fastest of all the protozoans
Cilia structure
Ciliate Biology Oral groove
Cytostome
Cytoproct
Contractile vacuole
Paramecium
Kingdom Protozoa12
Ciliate Lifestyles
65% of all ciliate species are free-living and mobile
Some ciliates form colonial aggregations and have sessile habits
Other ciliates have symbiotic relationships in invertebrates and vertebrates
Vorticella
Kingdom Protozoa13
The Sarcodinids (Amoeboid Protozoans)
Contains 4 phyla: Foraminifera, Radiozoa, Amoebozoa, and Heliozoa
Most reproduce asexually through binary fission
Characterized by pseudopodia
Food is usually captured by phagocytosis
Body types range from free flowing to rigid with skeletal supports
Kingdom Protozoa14
Phagocytosis
Kingdom Protozoa15
Amebas and Humans
Kingdom Protozoa16
Phylum Foraminifera
Defining characteristics– Individuals secrete
multi-chambered tests, generally made of calcium carbonate (CaCo3)
Foram. tests
Kingdom Protozoa17
Foraminiferans
Extremely abundant, most are benthic and marine
Feed on diatoms and algae, very slow movers Organisms are extremely common and form
ooze– White cliffs of Dover are foraminiferan tests
Kingdom Protozoa18
Phylum Radiozoa
Defining characteristics– Body is divided into distinct
zones separated by a perforated membrane or capsule
Have pseudopodia supported with thin microtubules that give a spiny rayed appearance
Kingdom Protozoa19
Radiolarians
Have shells made of silicon dioxide that can be very intricate
Feed on diatoms and other phytoplankton Benthic individuals move by use of
pseudopodia – Can occur in large concentrations that form
ooze as well
Kingdom Protozoa20
The Flagellated Protozoans
Characterized by the possession of a definite body shape and the possession of one or more flagella
Most species are free-living and mobile
Noctiluca
Kingdom Protozoa21
Phytoflagellated Protozoans
Have chlorophyll and obtain energy directly from the sunlight
Some are strictly autotrophic or heterotrophic– Some are a combination of both
Both the Euglena and the dinoflagellates are examples of phytoflagellated protozoans
Kingdom Protozoa22
Dinoflagellates
Know for bioluminescence and highly toxic red tides – Dense aggregations produce saxitoxin killing fish and
crustaceans Also contaminates shellfish causing diarrheic
shellfish poisoning Some benthic dinoflagellates produce a
neurotoxin that accumulates in tropical fish called Ciguatera
Kingdom Protozoa23
Phytoflagellated Protozoans
Noctiluca
Euglena
Ceratium
Chlamydomonas
Kingdom Protozoa24
Zooflagellated Protozoans
Free-living forms– Most individuals are sessile and have a single
flagellum that beats to obtain food and nutrients Parasitic forms
– 25% of zooflagellate spp. are parasitic in humans, invertebrates, and other vertebrates
– Usually have complex lifecycles with intermediate hosts
– Malaria is caused by the genus Plasmodium technically a member of the phylum Sporozoa
Kingdom Protozoa25
Zooflagellated Protozoans
Choanoflagellates
Malaria (Plasmodium)