Mudflat Habitats
Characteristics
• Low energy areas – sheltered
• Made up of sand, mud, clay, detritus that has
been deposited there
• Sediment – high organic content
• Often appear barren – a lot of life is under
the sediment
What type of animals live here?
• Marine Worms
– Burrow
• Mollusks
– Burrow down into the sediment – using
muscular foot
• Migratory Birds
Marine Worms
Segmented Worms
• Phylum Annelida
• Class Polychaeta
– Body consists of a series of similar
compartments segments
– Gut goes through all segments and lies in the
cavity known as the coelom
Phylum Annelida – segmented
worms
• Includes earthworm, leeches, marine
polychaetes (bristle worms)
• Body divided into ring-like segments
• Thousands of species
Phylum Annelida – segmented
worms
• Coelom – fluid-filled body space – between
digestive tube and body wall
Phylum Annelida – segmented
worms
• More developed organ systems:
–Digestive system
–Nervous system
–Circulatory system
• With hemoglobin to carry oxygen
• Closed – blood in veins, arteries
and capillaries
Phylum Annelida – segmented
worms
Phylum Annelida – segmented
worms
• Many lifestyles:
- burrow
- swim
- sessile
- live in tubes
Phylum Annelida – segmented
worms
• feeding strategies:
Parasites - attach to other organisms
and feed through suckers
Phylum Annelida – segmented
worms
• feeding strategies:
Suspension feeders – trap particles
floating in water
feather duster worm
Christmas tree worms
Phylum Annelida – segmented
worms
• feeding strategies:
Deposit feeders – eat particles that
have fallen to sea floor
Phylum Annelida – segmented
worms
• feeding strategies:
Predators – use “teeth” to grab prey
Phylum Annelida – segmented
worms
• Sandworm & Clamworm
– used for bait
• The following animals all belong to the same
PHYLUM. What characteristics do these
animals share?
Objective
Compare the three classes of
mollusks in terms of body plan,
defensive strategies, and feeding
strategies.
• Complete Sheet for “Shape of Life”
– Remember that you are comparing the three
classes based on structures (body plan),
defensive strategies, and feeding strategies
• Mollusks can be divided into three CLASSES:
– BIVALVES: two shells
– CEPHALOPODS: head connected to foot
– GASTROPODS: big foot
Mollusk Classes Reading
• PDF in Marine Bio folder – make a reading
question guide to go along with this.
• Take a look at the following video. What CLASS of
mollusk are you looking at? How do you know?
https://www.youtube.com/watch?v=sHg536CII2M
Classify these mollusks!
• Classify these mollusks activity description
– Ask Ben about this and put in directions.
BIVALVE GASTROPOD CEPHALOPOD
IDENTIFY 4 CHARACTERISTICS UNIQUE TO EACH
CLASS
STRUCTURE:
USED FOR:
STRUCTURE:
STRUCTURE:
USED FOR:
USED FOR:
ARE THERE ANY STRUCTURES FOUND ONLY IN
BIVALVES?
Which animals below are GASTROPODS?
STRUCTURE:
STRUCTURE:
USED FOR:
USED FOR:
STRUCTURE:
STRUCTURE:
STRUCTURE:
USED FOR:
USED FOR:
USED FOR:
ARE THERE ANY STRUCTURES FOUND ONLY IN
GASTROPODS?
https://www.youtube.com/watch?v=mLVDwlrSq5U
Take a look at the following video.
What CLASS of mollusk are you looking at?
How are they able to do this?
https://www.youtube.com/watch?v=dwYr1TJbue0
STRUCTURE:
USED FOR:
STRUCTURE:
USED FOR:
STRUCTURE:
USED FOR:
STRUCTURE:
USED FOR:
ARE THERE ANY
STRUCTURES
FOUND ONLY IN
CEPHALOPODS?
https://www.youtube.com/watch?v=kmBdE4Webpc
• In losing their hard shell, cephalopods gave up a
huge amount of protection. Take a look at the
video and explain what they might have gained.
Advantages:
TED TV Octopus
http://www.youtube.com/watch?v=YVvn8dpSAt0
• Compare Bivalves, Gastropods, and Cephalopods
CHARACTERISTICS
CHARACTERISTICS
CHARACTERISTICS
Shellfishing
Is it Legal Size?
Squid Web Quest
• Complete the Squid Web Quest in
preparation for the Squid dissection!!!
Squid Dissection
• WOOO!