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angeleenie70
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What are mollusks?
soft-bodied invertebrates that usually have a shell
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Examples of mollusks
- clams
- oysters
- snails
- slugs
- octopus
- squid
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What is the thin membrane that secretes the shell for many mollusks?
the mantle
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What type of circulatory system do mollusks have?
open
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What does "open circulatory system" mean?
the blood is not always inside the blood vessels the way a human's is
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How do Octopus and Squid swim?
using a jet-action water vascular system, water is forced out through a tube-like structure near the head which sends the mollusk quickly in the opposite direction
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Which mollusk is used in aquariums to help keep them clean from algae?
snail
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How does the snail keep the aquarium clean?
using their radula
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What is a radula?
A tongue-like organ used to scrape algae off of rocks
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What are the 3 classes of mollusks?
- Gastropods
- Bivalves
- Cephalopods
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What is the largest group of mollusks?
gastropods
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What is unique about gastropods?
they have only one shell
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What is another name for a Gastropod?
univalve
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What does Gastropod mean?
"stomach foot"
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What are examples of gastropods?
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What is unique about a Bivalve?
It has a hinged shell in two parts
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What are three examples of bivalves?
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Which bivalve is well-known for producing pearls?
the oyster
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How are pearls made?
- an irritant, such as a grain of sand, is embedded in the mantle
- the mollusk then coats the irritant with the same material used to produce the lining of its shell
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What does Cephalopod mean?
"head-footed"
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What are 4 examples of Cephalopods?
- octopus
- squid
- cuttlefish
- nautilus
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What is the only member of the Cephalopod that has an external shell?
nautilus
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What do the arms of the Octopus and Squid have?
disc-shaped suckers used for gripping their prey
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What is the difference in an Octopus and a Squid?
octopus has 8 arms, the Squid has 10
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What does Arthropoda mean?
"jointed foot"
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What is the largest phylum of animals?
Arthropoda
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What is an appendage?
- a structure that grows from the body
- example: arms and legs
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What are the 4 appendages of an arthropod?
- jointed legs
- claws
- pincers
- antennae
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What are the 3 body regions of an arthropod?
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What are the 4 classes of Arthropods?
- insecta
- arachnids
- crustaceans
- myriapods
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Which class of arthropods is the largest?
insecta
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What are some examples of insects?
- flies
- moths
- grasshoppers
- mosquitoes
- ants
- bees
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How do insects breathe?
using Spiracles, located in their abdomen
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What is a tympanum?
organ used by insects for hearing, located under their wings
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How many eyes do insects have?
- 3 simple eyes
- 2 compound eyes
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How do insects use simple eyes?
use them for detecting light and dark
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How do insects use compound eyes?
used for detecting color and movement in all directions at once
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What are insects that live in colonies called?
social animals
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What are 2 good examples of social animals?
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What does metamorphosis mean?
the change of body form and appearance
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What are 2 types of metamorphosis?
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What is complete metamorphosis?
- the larva looks entirely different from the adult
- example: butterfly
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What is incomplete metamorphosis?
- the larva is a "mini" version of the adult
- example: grasshopper
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What are the 4 stages of complete metamorphosis?
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What happens during the pupa stage?
- insect forms a chrysalis or spins a cocoon around itself
- it does not eat during this time and goes through many changes
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What are the 3 stages of incomplete metamorphosis?
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What are examples of arachnids?
- spiders
- scorpions
- mites
- ticks
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What are examples of crustaceans?
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give 2 examples of myriapods
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What are centipedes also known as?
Chilopods
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What are millipedes also known as?
Diplopods
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What is an enchinoderm?
- a "spiny-skinned" animal includes:
- starfish
- sea cucumbers
- brittle stars
- sea urchins
- sand dollars
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