Download Unit 9 Lesson 9 - Sonoma Valley High School

Unit 9 Lesson 9.6
Invertebrates
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Warm-up activity
Marine invertebrates are animals that do not have backbones, such as snails,
clams, crabs, lobsters, squid and worms. Describe two invertebrates that you
have seen, what they looked like, and what you found interesting about them.
Vocabulary
Cephalization: The concentration of ____________ ____________ and ____________
________________ at the front end of an animal’s body.
Exoskeleton: The tough covering that supports and ______________ the bodies of
many invertebrates
Hermaphrodite: An individual that has both male and female
_______________________organs
Radula: A tongue-shaped structure used for feeding by _________and _________.
Tube feet: Suction- cuplike structures used by _________________ to walk and to
____________ __________________of their prey.
Lecture
Flatworms
Mollusks
________, flattened body; simplest animal to have __________
____________________
Cephalization: most have a ____________.
Materials can ______________pass) easily in and out of body.
Free-living worms can be carnivores or ___________________.
Parasitic: feed on ___________ and body fluids or parts of
cells in host body.
Free-living worms have ________________: a group of cells
that can detect differences in light (not a true eye)
Movement: by ________________ and muscle cells.
Reproduction: most free-living worms are
___________________________, which have both male and
female reproductive organs.
____________________________ animals that usually have in
______________ or ______________ shell, including snails,
slugs, clams, squid and octopi. All have a free-swimming
larval phase called a ___________________. Common
ancestor of mollusks lived more than _______ million years
ago. Mollusks have a _________ for crawling, burrowing,
modified as tentacles for capturing prey. ______________:
thin layer of tissue that covers most of the body.
___________: made by glands that secrete calcium
carbonate. _______________, a flexible tongue-shaped
structure with hundreds of tiny teeth, used to scrape algae
off rocks, drill through shells of other animals, or to eat
prey (squid, octopi) ______________: a tubelike structure
through which water enters and leaves the body to deliver
food and for jet propulsion. ___________ for respiration.
Many mollusks are filter feeders-- can help improve water
quality by eating ____________and _________________.
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Bivalves
Gastropods
Cephalopods
Arthropods
Echinoderms
Cnidarians
_____________ ___________animals that include clams,
oysters, mussels and scallops. Their shells are held
together by 2 powerful muscles, the ________________ and
___________________ Most do not move far and burrow into
sand and mud for __________________. SF Bay has been
invaded by the zebra mussel. It can clog water and sewage
pipes.
_________ _________ (nudibranchs) or________-___________
(snails) mollusks that move by using a muscular foot.
__________ ____________ protect themselves by squirting ink
into the water; nudibranchs have _______________ in their
skin that taste bad or make the predator sick; their bright
_______________ are warnings not to eat them!
The most ________ mollusks, including octopi and squid.
Soft-bodied, with head attached to a single foot. This may
be separated into _____________ or arms. Most are
predators.
Tentacles have sucking disks that grab and hold prey. They
use _______and ___________ to move swiftly through the
water.
Most marine arthropods are __________________: crabs,
shrimp, lobsters, crayfish and barnacles. Most have 2 pairs
of antennae, 2 or 3 body parts, and chewing mouthparts
(mandibles). ______________________ head and thorax fused,
contains most of internal organs. __________________is the
posterior (back) part of the body. _____________: a
mouthpart adapted for biting and grinding food.
___________: large claws modified to catch and cut up food.
________________________: appendages used for swimming.
Spiny skin, water vascular system, tube feet,
___________________________________________________. Water
vascular system carries out respiration, circulation and
movement. __________________________ (mother pore) is the
opening to the outside. Tube feet act like suction cups to
______________ and pull open shells of prey. Sea stars eat by
pushing their ________________ out through their
_______________ pouring out digestive enzymes, then
digesting the prey..
Jelly larvae is a __________________ usually “sessile”
(stationary), with its mouth on top. Adult jelly is a freeswimming bell-shaped _____________________ with mouth
and tentacles on the bottom. Sea ,anemones remain sessile,
attached to rocks or sea bottom. All have a primitive nerve
net, a gastrovascular cavity for _____________________ and
stinging cells for catching ______________________.
Review Questions
1. What are tube feet?
2. Where is the “shell” in a squid?
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