1. Invertebrates

2. The animal kingdom has a wide diversity of living things
The animal kingdom has a wide diversity of living things. It is common to groups animals into two categories: animals without backbones, called invertebrates, and animals with backbones, called vertebrates.

3. Worms
Sponges
Arthropods
Mollusks
Invertebrates

4. Invertebrates with Soft Bodies-Mollusks
octopus
They live on land and fresh water and ocean water.
They make shells from minerals in the water
snail
squid

5. Mollusks Have shells in one stage of their life Have gills
Not all mollusks have shells (e.g., octopuses, squid, and slugs)
Their gut is equipped with jaws, tongue like structure with teeth
Nerves ring around the gut
The heart is located at the back end of the body
Must stay moist in order to survive
Muscular foot to move, dig, and hang on
Examples of mollusks: snails, clams, tusk shells, chitons, limpets, octopuses, squid, and slugs

7. Snail

8. Clams

9. Chiton

11. Octopus

12. Squid

13. Slugs

14. Worms They can grow back parts if they lose parts.
Some worms can grow to 30 METERS long
An earthworm has hairs on it to help it go through the dirt!!!
                                                             
Flatworm
Roundworms
Segmented

15. Worms Elongated body No arms, legs, or eyes
Internal body parts are in segments
Fluid filled body cavity provides support and flexibility
The gut is a straight tube
Simple nervous system
Poor sensory organs
Soft body parts without shell
There are four main groups of worms: (1) flatworms, or Platyhelminthes; (2) ribbon worms, or Nemertea; (3) roundworms, or Nematoda; and (4) segmented worms, or Annelida.

16. Flatworms

17. Ribbon Worms

18. Madagascar Tiny Worm

19. Round worms

20. Annelida (segmented)

21. Sponges No mouth, stomachs, or other organs Most live in oceans
Cannot move
They stink a lot

22. Sponges Simplest form of multi-cellular animals
Bottom-dwelling creature with attaches itself to something solid
Don’t have mouths
It exists by pumping water through its body. It gets food and oxygen this way.
Soft spongy tissue
Give birth to live larva
Skeleton is on the outside
There are two types of sponges: Encrusting sponges are similar to moss because they tend to cover the surfaces of rocks. Free-standing sponges have lots of inner volume compared with their surface area. Sometimes, they grow into strange shapes and gigantic sizes.

23. Encrusting sponges

24. Free-Standing Sponge

25. Invertebrates with Stinging Cells
They have tentacles
They have a mouth
They live on the ocean floor
They shoot poisonous darts
jellyfish
coral
Sea anemone

26. Arthropods There are 4 groups
Crustaceans
Arachnids
Insects
Chilopods
Arthropods

27. Crustacean
Any of a large class of mostly water-dwelling arthropods (as lobsters, shrimps, crabs, wood lice, water fleas, and barnacles) having an exoskeleton.
Arachnid
Any of a class of arthropods including the spiders, scorpions, mites, and ticks and having a segmented body divided into two regions of which the front part bears four pairs of legs but no antennae.
Chilopod
Any of a group of arthropods that includes the centipedes and millipedes.
Insect
Any of a class of arthropods (as butterflies, true bugs, two-winged flies, bees, and grasshoppers) with the body clearly divided into a head, thorax, and abdomen, with three pairs of jointed legs, and usually with one or two pairs of wings

28. Arthropod – Characteristics
They have keen sense organs
They have exoskeletons.
They have two or more segments (parts)

29. Crustaceans They have five pairs of legs
They live near or on the ocean floor
Live on land and water
They have antennae

30. Crustacean
Any of a large class of mostly water-dwelling arthropods (as lobsters, shrimps, crabs, wood lice, water fleas, and barnacles) having an exoskeleton.

31. Arachnids Spiders mites and ticks. 4 pairs of legs Most live on land.
Some live in fresh water
They are called parasites.

32. Arachnid
Any of a class of arthropods including the spiders, scorpions, mites, and ticks and having a segmented body divided into two regions of which the front part bears four pairs of legs but no antennae.

33. Insects Largest group of arthropods 3 pairs of legs
3 main body part sections
2 pairs of eyes
Have mouths

34. Insect
Any of a class of arthropods (as butterflies, true bugs, two-winged flies, bees, and grasshoppers) with the body clearly divided into a head, thorax, and abdomen, with three pairs of jointed legs, and usually with one or two pairs of wings

35. Chilopod
Any of a group of arthropods that includes the centipedes and millipedes.

36. Millipedes & Centipedes
Many body segments
Live under rocks & dark places
Really have less than 100 legs
Protects itself by curling up
Millipedes have 4 legs on each segment
Centipedes have 2 legs on each segment
millipede
centipede

37. Classifying Arthropods
Off all the invertebrate groups, arthropods contain the greatest diversity of animals. Arthropods include lobsters, millipedes, centipedes, spiders, crabs, scorpions, shrimp, and insects. Arthropods are found in more habitats in the world than any other animal group. Their huge variety of adaptations is what has made them so successful in different habitats. Adaptations are special features that help living things survive in different habitats.

38. Arthropod Adaptations:
Hard outer body covering called an exoskeleton (for example, a beetle)

39. Specialized mouth parts (for example the proboscis of a mosquito that sucks its victims blood)

40. Jointed legs (for example, a spider’s legs)

41. Compound eyes (for example the eyes of a fly)

42. Segmented body (for example, a centipede)

43. Although spiders and insects are classified as arthropods, they belong to different subgroups of arthropods. People often confuse spiders with insects. Insects have three main body parts: a head, a thorax and an abdomen. Insects also have six legs and up to four wings which come out of the thorax. But spiders have two body parts – a joined head and thorax, and an abdomen – and eight legs.

45. Jointed head and thorax
abdomen

46. Quiz next week on the characteristics of Invertebrates
Quiz next week on the characteristics of Invertebrates. More specifically, please study:
The characteristics of worms, sponges, molluscs, chilopods, crustaceans, arachnids, insects and arthropods.