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PROTISTS

Diatoms
Chrysophytes
• nota bene- chromosomes are attached to the nuclear envelope [Dinoflagellates]
—> Unique cellular division- has linear chromosomes
• When dinophyte blooms are so big and you see lots of fish kills, looking ate the
fish- breathing the air above the dead fish can cause you to catch a severe
illness or possibly death due to the presence of dinophytes
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Experience dizziness, or
respiratory problems etc
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Haptophytes
• Haptophytes are a group that have structures that a are sometimes hairy
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Have a
Haptoneme
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Have a flagella coming out but then you have the haptoneme
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The haptophyte swims forward whilst the
haptoneme stretches out and can see it touching other cells
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• There is another structure present known as the coccolithophorid [round stone]
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Resting state
of the haptophyte
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Have a set of different
characteristics associated with them as well
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This is because both of them have a specific type of
undillipodium associated with them known as the heterokont
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This heterokont nature matches
phologeny
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That is when they exhibit the tinsellated and naked undilipodiums
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if you grow diatoms in the
laboratory- need to provide silicic acid which is the outer covering of the
diatoms
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Have gaps in between the ridges
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• Gaps have pores that enable photons to go through them
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Get a remarkable
colour associated with diatoms
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There are
things that can digest glass such as HF acid that can dissolve glass
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So a good survival aspect associated with the glass wall
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The way these operate depending on
the type of diatom- the glass wall that it has will essential have a top and a
bottom valve that is part of the cell
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• When cells undergo division—> [refer to picture in n
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As the cell walls get smaller, you form motile gametesthe male form with the tinsellated and naked undilipodiums will swim to the
egg
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Process happens
extremely fast
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Often see a slit within the diatoms that run all the way along the diatomknown as the raphe- extends all the way through the bottom
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So how
would you move? Can stick out some of the cells which has a little bit of
eucopolysachharide that causes it to stick and then pull itself along
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• The next thing that happened is the appearance of multi-cellularity
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• They are fairly dominant
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Found in marine environments and
marine environments are tropical
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• Can differentiate based on phycobilins
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Brown colour associated with them is due to
the presence of fucoxanthine
Chlorophyte
• Has around 7000 species and are present in marine and fresh environments
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Engage in sexual activityhaploids fuse together- each one will have a different mating types
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Sex is a unicellular environment
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No motile state- want to engage in sexual activity
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Complexity of sex evolves with their
multicellularity
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[Gametic, zygotic and
sporic]



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