soft-bodied invertebrates that usually have a shell
Examples of mollusks
clams
oysters
snails
slugs
octopus
squid
What is the thin membrane that secretes the shell for many mollusks?
the mantle
What type of circulatory system do mollusks have?
open
What does "open circulatory system" mean?
the blood is not always inside the blood vessels the way a human's is
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
Which mollusk is used in aquariums to help keep them clean from algae?
snail
How does the snail keep the aquarium clean?
using their radula
What is a radula?
A tongue-like organ used to scrape algae off of rocks
What are the 3 classes of mollusks?
Gastropods
Bivalves
Cephalopods
What is the largest group of mollusks?
gastropods
What is unique about gastropods?
they have only one shell
What is another name for a Gastropod?
univalve
What does Gastropod mean?
"stomach foot"
What are examples of gastropods?
snails
slugs
conchs
What is unique about a Bivalve?
It has a hinged shell in two parts
What are three examples of bivalves?
oysters
clams
scallops
Which bivalve is well-known for producing pearls?
the oyster
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
What does Cephalopod mean?
"head-footed"
What are 4 examples of Cephalopods?
octopus
squid
cuttlefish
nautilus
What is the only member of the Cephalopod that has an external shell?
nautilus
What do the arms of the Octopus and Squid have?
disc-shaped suckers used for gripping their prey
What is the difference in an Octopus and a Squid?
octopus has 8 arms, the Squid has 10
What does Arthropoda mean?
"jointed foot"
What is the largest phylum of animals?
Arthropoda
What is an appendage?
a structure that grows from the body
example: arms and legs
What are the 4 appendages of an arthropod?
jointed legs
claws
pincers
antennae
What are the 3 body regions of an arthropod?
head
thorax
abdomen
What are the 4 classes of Arthropods?
insecta
arachnids
crustaceans
myriapods
Which class of arthropods is the largest?
insecta
What are some examples of insects?
flies
moths
grasshoppers
mosquitoes
ants
bees
How do insects breathe?
using Spiracles, located in their abdomen
What is a tympanum?
organ used by insects for hearing, located under their wings
How many eyes do insects have?
3 simple eyes
2 compound eyes
How do insects use simple eyes?
use them for detecting light and dark
How do insects use compound eyes?
used for detecting color and movement in all directions at once
What are insects that live in colonies called?
social animals
What are 2 good examples of social animals?
bees
ants
What does metamorphosis mean?
the change of body form and appearance
What are 2 types of metamorphosis?
complete
incomplete
What is complete metamorphosis?
the larva looks entirely different from the adult
example: butterfly
What is incomplete metamorphosis?
the larva is a "mini" version of the adult
example: grasshopper
What are the 4 stages of complete metamorphosis?
egg
larva
pupa
adult
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
What are the 3 stages of incomplete metamorphosis?