ANIMAL UNIT PRESENTATION PART 2

6 GROUPS OF INVERTEBRATES

• Cephalopods *Echinoderms
• Worms
• Arthropods
• Mollusks
• Cnidarian

CEPHOLOPODS

• Examples: octopus, giant squid, cuttlefish.
• Body Structure: arms, eye, funnel, fin, tentacle.
• Reproduction: they lay eggs, reproduce once in their life.
• Characteristics: they all have tentacles, some are carnivores, all are Mollusks.

WORMS

• Examples: round worms, flat worms, segmented worms.
• Body structure: mouth, segment, clitellum, anus.
• Reproduction: eggs are formed, then formed into a cocoon.
• Characteristics: no arms, legs, eyes. cold blooded. they
• live where there is food, moisture, oxygen.

ARTHROPODS

• Examples: shrimp, flies, spiders, crabs, ants, cockroaches, etc..
• Body structure: jointed appendix, segmented body, external skeleton.
• Reproduction: sexually and asexually, the female lays eggs. if it's
• asexually then the eggs are unfertilized, if it's sexually then, it is a fertilized egg.
• Characteristics: hard outer body, compound eyes, specialized mouth parts

MOLLUSKS

• Examples: tusk shells, slugs, octopus, snails, mussels, snails.
• Body structure: foot, gills, mantel, shell, foot, heart, stomach.
• Reproduction: reproduce sexually and the female fertilizes
• eggs forming plank tonic larval stage.
• Characteristics: soft bodies, covered by shells, mantel, muscular foot

CNIDARIAN

• Examples: jellyfish, coraland, and sea anemones.
• Reproduction: sexually, asexually, they produce eggs into the water.
• Characteristics: 2 body forms: swimming medusa, and sessile
• polyps. They are single organisms.
• Body structure: tentacle, mouth, ectoderm, mesoglea, endoderm

ECINODERMS

• Examples: sea stars, sand dollars, sea urchins, sea lilies.
• Reproduction: asexually, sexually, fertilize eggs.
• Body structure: rectum, anus, mouth, esophagus,
• tube feet, ring canal, ampulla.
• Characteristics: have pincers to paralyze food. 5 sections of the body.