1. Name 5 Arthropods
Arthropods and Echinoderms
2. Without opening your book:
• Name two ways they are alike.
• Name three ways they are different.
Arthropods and Mollusks
3. Without opening your book:
• Name two ways they are alike.
• Name three ways they are different
Phylum Arthropoda
• There are about 125,000,000 (one hundred,
twenty-five million)
species of animals on Earth.
Over one million of these
are in the Phylum Arthropoda.
• The name Arthropod means "jointed foot.“
4. Why are animals in
this group called Arthropods?
Characteristics of Arthropods
• Segmented bodies
• Jointed appendages –
legs and claws, wings,
antennae, mouth parts
Characteristics of Arthropods
• Bilateral
symmetry
• Exoskeleton
of jointed
protective armor
Characteristics of Arthropods
• Compound eye – they are made up of repeating
units with a lens, and visual cells. It is excellent for
detecting motion.
• Found in all habitats – land, water and air
5. Name FIVE characteristics of arthropods.
Characteristics of Arthropods
Systems:
Circulatory system with gills to obtain oxygen if
aquatic
Excretory system
Complete digestive system
Reproduction is sexual
3 Groups of Arthropods
• Insects – the most numerous
• Chelicerates – horse shoe crabs,
scorpions, ticks and mites
• Crustaceans – crabs, lobsters, crawfish and
shrimp
6. Name the 3 groups
Of Arthropods and examples
Of each.
Insects
• 3 pairs of legs
• Metamorphosis
• 3 body sections
• Most species can fly
Chelicerates
Horse shoe crabs, Spiders, Scorpions, ticks
and mites
• No antennae
• Two body sections
• Feeding appendages
called chelicerae
7. Do spiders have
antennae? How do
get their food?
Chelicerates: Horse Shoe Crab
• They live in coastal waters like The Gulf of Mexico.
• They burrow in soft mud looking for worms, clams and
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other mollusks.
The hard carapace of the exoskeleton is shaped like a
horse shoe and offers protection.
The pointed telson or tail is not used for defense or
offense and they can be handled safely.
8. Name and describe a marine chelicerate.
Crustaceans: crabs, barnacles,
lobsters, crawfish and shrimp
• 2 pairs of antennae
• Chelipeds – claws that are chewing mouth parts
Crustaceans: crabs, barnacles,
lobsters, crawfish and shrimp
• Two body sections:
1) cephalothorax includes the head and chest fused
together.
2) abdomen includes the tail. This is the part you eat! .
9. How is a crustacean crab different from a chelicerate horse shoe
crab?
Crustaceans: sex identification in
crabs
• Identify the sex of the
Crab by looking at the
abdomen.
• Females have wider
abdomens to carry the
eggs.
• Males have narrower
(triangular) abdomen.
Crustaceans: reproduction
• Sexual reproduction occurs often during the molting of
the exoskeleton.
10. What does the larva ( hatched egg) look like?
Crustaceans: reproduction
• Barnacles may be hermaphroditic, but sex is
more common. A barnacle¹s penis will stretch
quite a distance to fertilize a neighbor’s eggs.
11. What does “hermaphroditic” mean?
Crustaceans: decapods
Deca means 10
Lobsters
Shrimp
Crabs
Crayfish
12. How many legs do crabs and crayfish have?
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PLATES: includes fries and onion rings
Clam $10.95
Shrimp $10.95
Scallop $10.95
Calamari (squid)$6.95
Fried Lobster $16.95
Crab cakes $11.00
Crawfish bisque $8.00
Oysters on the half shell $12.00
13. Classify the items on the seafood menu as Mollusks or
Crustaceans