Chapter 10
What are the main characteristics of Mollusks?
- Invertebrate -Have a "foot" in various forms - many have a shell -Open Circulatory system - mantle secretes shell -Uses Gills
What are the characteristics of an arthropods?
-Invertebrates - external skeleton -segmented body - open circulatory system - jointed attachments called appendages -bilateral symmetry
Centipede Characteristics
1 Pair of legs on each segment. Predator that injects venom
What are the 4 major groups of Arthropods?
1. Crustaceans 2. Insects 3. Arachnids 4. Centipedes/Millipedes
Complete Metamorphosis- 4 stages
1. Egg 2. Larva 3. Pupa 4. Adult
What are 4 Characteristics of Echinoderms?
1. Invertebrate 2. endoskeleton 3. water vascular system 4. live in salt water
Describe in detail the unique way that a Starfish feeds on a Clam.
1.Tube feet attach itself to the prey (clam) and pry open the clam shell. 2. Stomach comes out of the mouth into the clam shell. 3. digestive juices come out and break down the clam. 4. Starfish then sucks up digested clam. *The digestions takes place inside the Clam.
Millipede Characteristics
2 Pairs of legs on each segments. Scavenger
How many body sections do Arachnids have?
2 body sections
How many pairs of antennae does Crustaceans have?
2 pairs of antennae- (they are the only arthropod with 2 pair)
What is an insect?
3 body sections,(head, thorax, abdomen) 6 legs, 1 pair of antennae. 1 or 2 pairs of wings.
Insects have how many pairs of legs?
3 pairs of legs
How many arms does a Starfish have?
5 arms - they can also grow them back.
Metamorphosis
A process in which an animal's body changes dramatically in a short time.
Mollusk
A soft-bodied invertebrate with a hard protective covering and bilateral symmetry.
Appendages
An external body part. Example: legs, wings, antenna
Open Circulatory System
Blood is not contained in veins or vessels. (mollusk feature)
Gills
Breathe using these, they remove oxygen from the water. (mollusk feature)
What does Starfish eat?
Clams & Oysters
What type of circulatory system does a Cephalopod have?
Closed circulatory system
What are examples of animals that are Crustaceans?
Crayfish, lobster, shrimp and crab
How does an exoskeleton help arthropods live on land?
Exoskeleton is waxy and waterproof, so they don't dry out.
Cephalopod description
Foot divided into tentacles or arms around its mouth, are carnivores and use tentacles to capture prey, tentacles have suckers on them.
What are the 3 Groups of Mollusks?
Gastropoda (largest group), Bivalvia, and Cephalopoda.
What is a shell of a mollusk made of?
Glands in the mantle that secrete calcium carbonate.
The name Cephalopod means what?
Head foot
How does an adult echinoderm have a unique body symmetry?
It has radial symmetry in which the body parts, usually in multiples of 5. Are arranged like spokes on a wheel.
Foot
Moves with a muscular foot, oozes out a sticky substance making it easier to move. (mollusk feature)
How are Starfish able to coordinate the movement of the tube feet?
Nerve ring
Siphon
Pumps water in and out. (mollusk feature)
Radula
Razor sharp, rough tongue. Eat by scraping food with this. (mollusk feature)
Name some animals that are examples of Echinoderms.
Sea cucumbers, Sea Stars, Sea Urchins and Sand dollars.
What helps Starfish gather information about their surroundings?
Special Sensory Cells
What are examples of animals that are Arthropods?
Spider, grasshopper, crabs, lobsters, centipedes and scorpions.
What are examples of animals that are Arachnids?
Spiders, mites, ticks, scorpions
How do Cephalopod's swim
Swim with jet propulsion, squeeze water out of mantle.
Gradual Metamorphosis (Incomplete)
The egg hatches into a nymph (which looks like a small adult) 1. Egg 2. Nymph 3. larger Nymph 4. Adult
What happens to an exoskeleton when an arthropod grows?
The exoskeleton does not grow or expand, so it is shed and a new larger one grows. This is called molting.
What is the "Water Vascular System" in echinoderms and what body part does it control?
The internal system of fluid-filled tubes in echinoderms that can contract, squeeze together forcing water into structures called tube feet. This enables the tube feet to (1)move slowly and (2)capture food.
Molting
The process of shedding an outgrown exoskeleton.
Crustacean
They thrive in fresh water, lakes, rivers and even in puddles. You can find them in the ocean and along coastlines.
Mantle
Thin layer of protective covering/tissue that makes the shell and protects internal organs. (mollusk feature)
Cephalopod nervous system description
Well developed, complex nervous system. Large brains that can remember things they learn. With huge eyes.
What is an example of appendages found in arthropods?
wings, legs and mouthparts
