ProtistsThe world of Protists:

Animal-like ProtistsPlant-like Protists

Fungus-like Protists

Kingdom ProtistaCell Number: Mostly single-celled, some

colonialCell Type: Eukaryotic (has a nucleus and

organelles)Feeding: Hetero or autotrophicReproduction: Mostly asexual

Summary: Single-Celled Eukaryotes

Protist Diversity200,000 species come in different shapes, sizes, and colors

All are eukaryotes – have a nucleus and membrane-bound organellesReproduce sexually or asexually

ProtozoansAnimal-like Protists

ProtozoansUnicellular – made up of one cell

Heterotrophs – they eat other organisms or dead organic matter

Classified by how they move

Phyla of ProtozoansAmoebas

FlagellatesCiliates

Sporazoans

Amoebas: the blobsNo cell wallMove using pseudopods – plasma extensions or “fake feet” (draw picture)

Engulf bits of food by phagocytosis

http://www.britannica.com/needmore

Flagellates: the motorboats

Use a flagella – a whip like tail to move (draw one)

Some cause diseases

Trichomonas vaginalis: an STD

Ciliates: the hairy onesMove with cilia – tiny beating hairs (draw one)

Sporazoans: the parasite

Non-motile - Do not moveLive inside a hostOne type causes malaria

Malaria in red blood cells

Algae

Plantlike Protists

What are Algae?Colonial– made of more than

one cell, but can live singularly

Photosynthetic – make their own food

No roots, stems, or leavesEach has chlorophyll and

other photosynthetic pigments

Phyla of AlgaeEuglenoids

DiatomsDinoflagellates

Red, Brown, & Green Algae

Euglenoids: The Survivors

AquaticMove around like animalsCan ingest food from surroundings when light is not available

Diatoms: The Golden Ones

Have shells made of silica (glass)

Photosynthetic pigment called carotenoids – give them a golden color

http://www.ucmp.berkeley.edu/chromista/diatoms/centriclive.jpg

Dinoflagellates: The Spinning Ones

Spin around using two flagella

Responsible for Red TidesCreate toxins that can kill animals and sometimes people

Red Algae: The…uh…Red Ones

(duh)Seaweedsmarine organismsHave red and blue pigments

Brown Algae: The Brown Ones

(You think?)They have air bladders to

help them float at the surface – where the light is.

Green Algae: Yeah, You Guessed it,

The Green OnesMost live in fresh waterLive alone or in groups called colonies

Ancestor to land plants

Fungus-like Protists

Characteristics in Common

All form delicate, netlike structures on the surface of their food source, mold-like

Obtain energy by decomposing organic material

Phylaof

Fungus-like ProtistsPlasmodium Slime Molds

Cellular Slime MoldsWater Molds & Downy

Mildews

Slime Molds

Live in cool moist, shady places where they grow on damp, organic matter

Plasmodium Slime Molds

Form plasmodium: a mass of cytoplasm that contains many diploid nuclei but no cell walls or membranes – its feeding stage

Creeps by amoeboid movement – 2.5 cm/hour

Plasmodium continued…

May reach more than a meter in diameter

Form reproductive structures when surroundings dry up

Spores are dispersed by the wind and grow into new plasmodium

Cellular Slime MoldsIn feeding mode, they exist as individual amoebic cells

When food becomes scarce, they come together with thousands of their own kind to reproduce

May look like a plasmodium

Water Molds and Downy Mildews

Live in water or moist places

Feed on dead organisms or parasitize plants

Fuzzy white growths

That’s All