1. Name 5 Arthropods1. Name 5 Arthropods

Arthropods and Arthropods and EchinodermsEchinoderms

2. Without opening your book2. Without opening your book::•Name two ways they are alike.Name two ways they are alike.•Name three ways they are differentName three ways they are different..

Arthropods and Arthropods and MollusksMollusks

3. Without opening your book3. Without opening your book::•Name two ways they are alike.Name two ways they are alike.•Name three ways they are Name three ways they are

differentdifferent

Phylum ArthropodaPhylum Arthropoda• There are about 125,000,000 There are about 125,000,000 (one hundred, (one hundred,

twenty-five million) twenty-five million) species of animals on Earthspecies of animals on Earth.. Over one million of theseOver one million of these are in the Phylum Arthropoda.are in the Phylum Arthropoda.

• The name The name ArthropodArthropod means "jointed means "jointed foot.“foot.“

4. 4. Why are animals in Why are animals in this group called Arthropods?this group called Arthropods?

Characteristics of Characteristics of ArthropodsArthropods• Segmented bodiesSegmented bodies

• Jointed appendages –Jointed appendages – legs and claws, wings, legs and claws, wings, antennae, mouth partsantennae, mouth parts

Characteristics of Characteristics of ArthropodsArthropods• Bilateral Bilateral symmetrysymmetry

• Exoskeleton Exoskeleton of jointed of jointed protective armorprotective armor

Characteristics of Characteristics of ArthropodsArthropods• Compound eye – Compound eye – they are made up of repeating they are made up of repeating

units with a lens, and visual cells. It is excellent for units with a lens, and visual cells. It is excellent for detecting motiondetecting motion..

• Found in all habitats – land, water and airFound in all habitats – land, water and air5. Name FIVE characteristics of arthropods.5. Name FIVE characteristics of arthropods.

Characteristics of Characteristics of ArthropodsArthropodsSystems:Systems:Circulatory system with gills to obtain Circulatory system with gills to obtain

oxygen if aquaticoxygen if aquaticExcretory systemExcretory systemComplete digestive systemComplete digestive systemReproduction is sexualReproduction is sexual

3 Groups of Arthropods3 Groups of Arthropods• Insects – the most numerousInsects – the most numerous

• Chelicerates – horse shoe crabs, Chelicerates – horse shoe crabs, scorpions, ticks and mitesscorpions, ticks and mites

• Crustaceans – crabs, lobsters, crawfish and Crustaceans – crabs, lobsters, crawfish and shrimpshrimp

66. . Name the 3 groupsName the 3 groupsOf Arthropods and examplesOf Arthropods and examplesOf each.Of each.

InsectsInsects

• 3 pairs of legs3 pairs of legs• MetamorphosisMetamorphosis• 3 body sections3 body sections• Most species can flyMost species can fly

CheliceratesCheliceratesHorse shoe crabs, Spiders, Scorpions, Horse shoe crabs, Spiders, Scorpions,

ticks and mitesticks and mites• No antennaeNo antennae• Two body sectionsTwo body sections• Feeding appendagesFeeding appendages called cheliceraecalled chelicerae

7.7. Do spiders have Do spiders have antennae? How doantennae? How do get their food?get their food?

Chelicerates: Horse Shoe Chelicerates: Horse Shoe CrabCrab• They live in coastal waters like The Gulf of Mexico.They live in coastal waters like The Gulf of Mexico.• They burrow in soft mud looking for worms, clams and other They burrow in soft mud looking for worms, clams and other

mollusks.mollusks.• The hard carapace of the exoskeleton is shaped like a horse The hard carapace of the exoskeleton is shaped like a horse

shoe and offers protection.shoe and offers protection.• The pointed telson or tail is not used for defense or offense The pointed telson or tail is not used for defense or offense

and they can be handled safely.and they can be handled safely.

8.8. Name and describe a marine chelicerate. Name and describe a marine chelicerate.

CrustaceansCrustaceans:: crabs, crabs, barnacles, lobsters, crawfish and barnacles, lobsters, crawfish and shrimpshrimp• 2 pairs of antennae2 pairs of antennae• Chelipeds – claws that are chewing mouth partsChelipeds – claws that are chewing mouth parts

CrustaceansCrustaceans: : crabs, barnacles, crabs, barnacles, lobsters, crawfish and shrimplobsters, crawfish and shrimp• Two body sections: Two body sections: 1) cephalothorax includes the head and chest fused 1) cephalothorax includes the head and chest fused

together. together. 2) abdomen includes the tail. This is the part you 2) abdomen includes the tail. This is the part you

eat! eat! ..

99. How is a crustacean crab different from a chelicerate horse . How is a crustacean crab different from a chelicerate horse shoe crab?shoe crab?

CrustaceansCrustaceans: : sex sex identification in crabsidentification in crabs• Identify the sex of the Identify the sex of the Crab by looking at theCrab by looking at theabdomen.abdomen.• Females have wider Females have wider abdomens to carry the abdomens to carry the eggs. eggs. • Males have narrowerMales have narrower(triangular) abdomen. (triangular) abdomen.

Crustaceans:Crustaceans: reproductionreproduction• Sexual reproduction occurs often during the Sexual reproduction occurs often during the

molting of the exoskeletonmolting of the exoskeleton. . 10.10. What does the larva ( hatched egg) look like? What does the larva ( hatched egg) look like?

Crustaceans:Crustaceans: reproductionreproduction

• Barnacles may be hermaphroditic, but sex is more Barnacles may be hermaphroditic, but sex is more common. A barnacle¹s penis will stretch quite a distance common. A barnacle¹s penis will stretch quite a distance to fertilize a neighbor’sto fertilize a neighbor’s eggseggs..

11.11. What does “hermaphroditic” mean? What does “hermaphroditic” mean?

CrustaceansCrustaceans: : decapodsdecapods Deca means 10Deca means 10

Lobsters ShrimpLobsters Shrimp

CrabsCrabs

CrayfishCrayfish

12.12. How many legs do crabs and crayfish have? How many legs do crabs and crayfish have?

• PLATES: PLATES: includes fries and onion ringsincludes fries and onion rings• Clam $10.95 Clam $10.95 • Shrimp $10.95Shrimp $10.95• Scallop $10.95Scallop $10.95• Calamari (squid)$6.95Calamari (squid)$6.95• Fried Lobster $16.95 Fried Lobster $16.95 • Crab cakes $11.00Crab cakes $11.00• Crawfish bisque $8.00Crawfish bisque $8.00• Oysters on the half shell $12.00Oysters on the half shell $12.00

13.13. Classify the items on the seafood menu as Classify the items on the seafood menu as Mollusks or CrustaceansMollusks or Crustaceans