patterns in nature by duvia babu. invertebrates animals that don’t have backbone are called...
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PATTERNS IN NATURE
BY
DU
VI A
BA
BU
INVERTEBRATES
Animals that don’t have backbone are called invertebrates
For example: prawns
crabs
shrimps
snails and
earthworms
MOLLUSESo They move with their muscular feet.o Animals like squids, slugs and
octopuses have a soft outer covering.
o Snail and sea shell have a hard outer covering called EXOSKELETON.
ANIMALS WITHOUT LEGS
Worms
(i) segmented worms:body of the worm is made up of ring like section called SEGMENTS
:the body has a soft outer covering.
For example: earthworm
(ii)non-segmented worms:they have soft and cylindrical body without any segments.
For example: round worm
:they have soft and flat bodies
:several rectangular sections are found behind the head which break off to form a new worm.
Eg: tapeworm
ARTHROPODS
They are the largest group of invertebrates.
They have joined legs and bodies
• (i) INSECTS:they are small creatures which have :
• a body divided into 3 parts& they are head, thorax and abdomen.
• 3pairs of legs.• some of them have
antennae on their head.• wings are attached to
their thorax.• For example: beetle , ants and• bee
ARACHNIDS:these are creatures which have:
4pairs of legs body divided into 2
parts scorpions have pincers on their head
Eg:spider
Crustaceans have 5 pairs of legs they live in water they have
antennae in some cases
their front pair of legs are used as pincers.
Eg: crabs lobsters and shrimps
Many pairs of legs:these creatures have several pairs of legs
:their body is divided into several segments
Millipedes:they have two pairs of legs per segment.
Centipedes:they have 1 pair of legs per segment