Download INVERTEBRATES 1.Have no inner skeleton or back bone (spinal

INVERTEBRATES
1.Have no inner skeleton or back bone (spinal column)
2.Differ SIZE :
SHAPE:
BODY COVERING:
in:
very small or
Bilateral symmetry: two identical halves or planes
no covering or
enormous
Radial symmetry: several planes
shells or
Asymmetry: irregular, no symmetry
exoskeleton
3.Habitat:
ocean fresh water land
inside other animals (harm them (*PARASITES))
4.Movement:
can move
don’t move: attach themselves to rocks or ocean floor
5.Oviparous: larva hatches from an egg
SPONGES
-Irregular bodies -Filter sea water
-No symmetry
and retain
-Can’t move:
nutritive
attach
substances
themselves to
rocks or the
ocean floor
-Examples:
*SPONGES
ECHINODERMS
-Five-way
-Covered by a
symmetry
thin skin
-Skeleton made
-Marine
of hard plates
with spines
-Examples:
*STARFISH,
*SEA URCHIN,
*OFIURA STAR
INVERTEBRATE GROUPS
CNIDARIANS
-Jelly-like bodies
-Attach themselves to
-Radial symmetry
rocks: *CORAL and *SEA
(some)
ANEMONE
-Tentacles that can -Move About:
sting you
*MEDUSAS
-More Examples:
*JELLYFISH
ARTHROPODS
-Bilateral symmetry
-MOLTING: from time
-Bodies (legs and
to time, they molt the
antennae) totally
exoskeleton and grow a
covered by an
new one until it
articulated
becomes rigid
exoskeleton (armor)
-Have simple eyes or
made up of many
-Have compound eyes:
small plates
thousands of smaller
-Well developed
simpler “eyes”
sense organs
-Have antennae
-Examples: *BEETLE,
*SCORPION, *RIVER
CRAB
WORMS
-Soft bodies
-Aquatic or
-Bilateral
terrestrial
symmetry
-Parasites (many)
-Cylindrical or flat
-Examples: *PLANARIA, *TAPEWORM,
*EARTHWORM
MOLLUSKS
-Soft bodies
-Aquatic or
-Bilateral
terrestrial
symmetry
-Vary in:
-Covered with one respiration,
or two shells
movement,
(many)
habitat
-Examples:
*SNAIL,
*CLAM,
*OCTOPUS
PRINCIPAL GROUPS OF ARTHROPODS
INSECTS
CRUSTACEANS
-They are the most numerous animal group
-Aquatic (most)
-Many habitats except the open ocean
-Ten legs (many)
-Eat many types of food
-Two pairs of antennae (4 antennae)
-Body divided into three parts:
-Compound eyes on a pedicel (stalk or stem that joins an organ to
the animal)
-Head
-Thorax
-Abdomen
-Body divided into two parts:
Mouth Two Two
Six
Wings
Abdomen
Cephalothorax
eyes antennae
legs (many)
-Produce useful substances to people (some): *BEES, *SILK WORMS -Are used for food: *LOBSTERS, *SHRIMP, *CRABS
-More examples: *SEA CRABS, *RIVER CRABS
-Cause illness, destroy crops, spoil food
PRINCIPAL INSECT GROUPS:
*BEES,
*FLIES,
*BEETLES
*BUTTERFLIES
*WASPS,
*MOSQUITOES
*ANTS
ARACHNIDS
-Eight legs
-Body divided into two parts:
Abdomen
Cephalothorax
-Terrestrial (most)
-Carnivorous (some): hunt and eat other animals
-Examples: *SPIDERS
GASTROPODS
-Head with 4 tentacles (sense organs)
-A single foot to move
-Marine g. eat algae
-Terrestrial g. are herbivores
-Single spiral shell (most) that protect
internal organs
-No shells (some): *SLUGS
-Are useful for human beings: The shells for
jewelry, *COMMON SNAIL for food
-Examples: *SEA SNAIL
MYRIAPODS
-Long bodies with many identical segments
-Each segment has one or two pairs of legs (2 or 4 legs)
-Head: one pair of short antennae (2 antennae)
-Example: *CENTIPEDES
PRINCIPAL GROUPS OF MOLLUSKS
BIVALVES
-Shell with two articulated valves
-The valves can open and close
-Soft bodies
-No apparent head
-Attach to rocks on the ocean floor:
*MUSSELS
-Move around: *SCALLOPS, *OYSTERS
-Filter salt water and retain nutritive
substances
-Are food for humans (many): *MUSSELS,
*OYSTERS
CEPHALOPODS
-Well developed brain
-8 or 10 tentacles with suction cups
-Marine
-Expel jets of water to move
-No protective body covering
-Small internal skeleton: cartilage (some)
-Carnivorous: capture other animals with
the tentacles and eat them
-Are food for people (some): *OCTOPUS,
*SQUID
-More Examples: *CUTTLEFISH, *OCTOPUS