Invertebrates
María Liste
There are many different types of invertebrates and
we classify them into groups.
The main groups of invertebrates are:
Arthropods
Molluscs
Insects
Gastropods
Arachnids
Crustaceans
Myriapods
Bivalves
Cephalopods
Other
invertebrates
Worms
Echinoderms
Jellyfish
Sponges
jointed legs.
arms.
and slugs.
Have spiny skin
Radial symmetry
.
For example starfish
Let’s check
some
examples.
Arthropods
Arthropods
Insects
Ants
jointed legs.
Grasshoppers
Honey bees
Arthropods
Insects
jointed legs.
Beetles
Praying
mantises
Arthropods
Mosquitoes
Insects
jointed legs.
Arthropods
Insects
jointed legs.
Butterflies
Dragonflies
Arthropods
Pond Skaters
Insects
jointed legs.
Ladybirds
Arthropods
Arachnids
jointed legs.
Spiders
Arthropods
Scorpions
Arachnids
jointed legs.
Arthropods
Ticks and mites
are also arachnids
Dog tick
Arachnids
jointed legs.
A large dust mite measures
around 0.3 millimeters in size,
so it is impossible to see it with
the naked eye.
Arthropods
Crustaceans
jointed legs.
Crabs
Lobsters
Crustaceans
jointed legs.
Arthropods
Arthropods
Crustaceans
jointed legs.
Shrimps/ prawns
Krill
Crustaceans
jointed legs.
is also a small swimming crustacean.
Millipedes
Centipedes
Myriapods
jointed legs
Arthropods
Molluscs
Molluscs
Snails
Gastropods
and slugs.
Molluscs
Gastropods
and slugs.
Slugs
Molluscs
Clams
Razor
shells
Cockles
Mussels
Bivalves
Scallops
Molluscs
Squids
Cephalopods
arms.
Siphon: Propels the squid
(water enters mantle cavity
and exits through siphon)
Molluscs
Cuttlefish
Cephalopods
arms.
Molluscs
Octopus
Blue-ringed octopus (click here to
learn more)
Cephalopods
arms.
8 arms
Other
invertebrates
Earthworms
Worms
Sea cucumbers
Sea urchins
Echinoderms
●
●
●
Have spiny skin.
Have radial symmetry.
For example starfish.
Starfish
Jellyfish
Sponges
How many Species of animals are there?
Invertebrates: 97% of all known species
Sponges: 10,000 species
Cnidarians: 8,000-9,000 species
Mollusks: 100,000 species
Echinoderms: 6,000 species
|Annelids: 12,000 species
Animals: estimated 3-30
million species
Vertebrates: 3% of all known species
Reptiles: 7,984 species
Amphibians: 5,400 species
Birds: 9,000-10,000 species
Mammals: 4,475-5,000 species
Ray-Fish: 23,500 species
Arthropods:
|
Crustaceans: 40,000 species
Insects: 2-30 million species !!
Arachnids: 75,500 species
Of all invertebrates, the insects are by far the most numerous.
Scientists have identified about 925,000 species of insects.
It is estimated that there are between 2 million and 30 million
species of insects on Earth.
Video
to review all the
invertebrates
with tapescript
and exercises.
Visit this website if you are interested in more great videos about animals