Molluscs
What does the word "cephalopod" mean?
It means "feet on the head".
What's the meaning on the word "arthropod"
Articulated legs/limbs
How is their shape?
They're sac - shaped organisms.
What are the 3 types of cnidarians?
Polips, jellyfish and coral.
What are the 3 types of echinoderms?
Starfish, sea urchins and sea cucumbers.
Say one example of each of the types.
Gastropods: snail
Bivalves: Mussels
Cephalopods: octopus and squid
What are the 3 segments that compose the body of an arthropod?
Head, thorax and abdomen
Where and how do they live?
They live in aquatic environments attached to rocks.
What do they have on their tentacles and what are they used for?
They have urticant glands. They're used to paralize or kill their prey because they're carnivours
How is called the system that some echinoderms have that works as a circulatory system and is essential for the echinoderm to move?
Ambrulacral system
How can be their shell/shells?
Internal or external.
What is the definition of metamorphosis?
It is a process in which the individual experiences different stages with an abrupt change between them. Like a caterpillar and a butterfly.
What is the name of the structures that they have a lot along all the body?
They're called pores.
What do they have to digest and absorb the nutrients and the oxygen?
A unic gastrovascular cavity.
What are the 3 types of worms?
Annelids, nematodes and platyhelminthes.
What are the 3 types of molluscs?
Gastropods, bivalves and cephalopods.
What are the names of the 4 types of arthropods?
Insects, crustaceans, arachnids and myriapods.
How is their nutrition process called?
Filtration
Why is their reproductive cycle called MIXED CYCLE?
Because it includes a sexual phase and also an asexual one.
What is the Aristotle's lantern?
It is a structure that some echinoderms have to help them catch their prey, because they're carnivours.
What are the functions of the MANTLE?
To protect the rest of the organs and to produce the shell of the mollusc.
How many legs have each type of arthropod?
Insects: 6 legs
Arachnids: 8 legs
Crustaceans: 10 legs
Myriapods: many legs (mostly between 11 - 300)
What are the 3 steps in filtration?
1. The water with the nutrients goes through the pores.
2. The cells of the sponge take the nutrients.
3. The water without nutrients is expelled through a hole called osculum.
How is their shape?
Sac - shaped organisms, like porifera.
What are the characteristics for each type of worm?
- Platyhelminthes: Flat body with segments (metameres).
- Nematodes: Cylindrical body without segments.
- Annelids: Cylindrical body with segments (metameres).